Recombinant Eucalyptus globulus subsp. globulus ATP synthase subunit b, chloroplastic (atpF)

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Description

Structure and Function of ATP Synthase Subunit b

ATP synthase consists of two domains: the membrane-embedded F₀ sector (proton channel) and the soluble F₁ catalytic core. Subunit b, encoded by the atpF gene, anchors the F₀ and F₁ regions via a peripheral stalk, ensuring structural stability and proton gradient coupling . In chloroplasts, this subunit is integral to photophosphorylation.

PropertyDetails
Gene NameatpF
Protein Length (chloroplast)~184 amino acids (varies by species)
DomainsN-terminal transmembrane helix, C-terminal soluble domain
RoleStabilizes ATP synthase structure; facilitates proton translocation

Recombinant Production and Characteristics

Recombinant atpF proteins are typically expressed in E. coli with affinity tags (e.g., His-tag) for purification. While E. globulus-specific data is scarce, homologous proteins from Fagopyrum esculentum and Cyanidium caldarium provide benchmarks :

SpeciesExpression SystemTagPurityApplications
Fagopyrum esculentumE. coliN-terminal His>85%Structural studies, enzyme assays
Cyanidium caldariumE. coliVariable>85%Antibody production, functional studies
E. globulus (hypothetical)E. coli (predicted)His-tagN/APending experimental validation

Key challenges include preserving transmembrane domains during solubilization and ensuring proper folding in heterologous systems .

Functional Insights

  • Role in Stress Response: In plants like Arabidopsis, ATP synthase subunits are downregulated under drought stress, impairing ATP production . Similar mechanisms may occur in E. globulus, though transcriptomic studies on its chloroplast proteins are lacking .

  • Enzyme Inhibition: The epsilon subunit (analogous to bacterial γ/ε subunits) undergoes conformational changes to regulate ATP hydrolysis, a feature conserved across species .

Biotechnological Potential

  • Photosynthesis Optimization: Engineering atpF could enhance photosynthetic efficiency in Eucalyptus, improving biomass yield .

  • Stress Tolerance: Overexpression of ATP synthase subunits in poplar improved salt tolerance, suggesting analogous strategies for Eucalyptus .

Knowledge Gaps and Future Directions

  • Species-Specific Data: No peer-reviewed studies directly characterize recombinant E. globulus atpF. Genomic resources (e.g., E. grandis TPS gene clusters ) hint at complex regulatory networks but lack chloroplast-focused analyses.

  • Expression Challenges: Optimizing transmembrane domain stability in E. coli remains a hurdle .

Product Specs

Form
Lyophilized powder
Note: While we prioritize shipping the format currently in stock, please specify your format preference during order placement for customized preparation.
Lead Time
Delivery times vary depending on the purchasing method and location. Please consult your local distributor for precise delivery estimates.
Note: All protein shipments include standard blue ice packs. Dry ice shipping requires prior arrangement and incurs additional charges.
Notes
Avoid repeated freeze-thaw cycles. Store working aliquots at 4°C for up to one week.
Reconstitution
Centrifuge the vial briefly before opening to consolidate the contents. Reconstitute the protein in sterile, deionized water to a concentration of 0.1-1.0 mg/mL. For long-term storage, we recommend adding 5-50% glycerol (final concentration) and aliquoting at -20°C/-80°C. Our standard glycerol concentration is 50%, which can serve as a guideline.
Shelf Life
Shelf life depends on several factors including storage conditions, buffer composition, temperature, and the protein's inherent stability.
Generally, liquid formulations have a 6-month shelf life at -20°C/-80°C, while lyophilized formulations have a 12-month shelf life at -20°C/-80°C.
Storage Condition
Store at -20°C/-80°C upon receipt; aliquot for multiple uses. Avoid repeated freeze-thaw cycles.
Tag Info
Tag type is determined during the manufacturing process.
The tag type is determined during production. If you require a specific tag, please inform us, and we will prioritize its development.
Synonyms
atpF; ATP synthase subunit b, chloroplastic; ATP synthase F(0 sector subunit b; ATPase subunit I
Buffer Before Lyophilization
Tris/PBS-based buffer, 6% Trehalose.
Datasheet
Please contact us to get it.
Expression Region
1-184
Protein Length
full length protein
Species
Eucalyptus globulus subsp. globulus (Tasmanian blue gum)
Target Names
atpF
Target Protein Sequence
MKNVTDSFVSLGHWPSAGSFGFNTDILATNPINLSVVLGVLIFFGKGVLSDLLDNRKQRI LNTIRNSEELRGGAIEQLEKARARLRKVEMEAEQFRVNGYSEIEQEKLNLINSTYKTLEQ LENYKNETIHFEQQRAINQVRQRVFQQALQGALGTLNSCLNNELHLRTISANIGMFGAMK EITD
Uniprot No.

Target Background

Function

F1F0 ATP synthase synthesizes ATP from ADP using a proton or sodium gradient. This enzyme comprises two domains: the F1 domain, containing the extramembrane catalytic core; and the F0 domain, containing the membrane proton channel. These domains are connected by a central stalk and a peripheral stalk. ATP synthesis in the F1 catalytic domain is coupled to proton translocation through a rotary mechanism involving the central stalk subunits.

This protein is a component of the F0 channel and forms part of the peripheral stalk, linking F1 and F0.

Protein Families
ATPase B chain family
Subcellular Location
Plastid, chloroplast thylakoid membrane; Single-pass membrane protein.

Q&A

What is the structural and functional role of ATP synthase subunit b in chloroplasts?

ATP synthase subunit b (atpF) is a critical component of the membrane-embedded CF₀ subcomplex of chloroplast ATP synthase. This protein plays an essential structural role in forming the peripheral stalk that connects the CF₀ and CF₁ subcomplexes. The peripheral stalk, including subunit b, serves as the stator that prevents rotation of the α₃β₃ hexamer during catalysis, allowing the energy from proton flow to be effectively coupled to ATP synthesis .

Functionally, subunit b participates in:

  • Maintaining structural integrity of the ATP synthase complex

  • Facilitating proper assembly of the entire enzyme complex

  • Contributing to the stability of the peripheral stalk

  • Possibly participating in regulatory interactions

Unlike the γ subunit that contains redox-active cysteine residues involved in thioredoxin-mediated regulation, subunit b is not directly involved in redox regulation but is essential for proper enzyme function .

What expression systems are most suitable for recombinant production of chloroplastic atpF from E. globulus?

Bacterial expression systems, particularly E. coli, remain the most widely used platform for recombinant chloroplastic protein production due to their simplicity, cost-effectiveness, and scalability. For E. globulus atpF expression, the following methodological considerations are important:

Expression system recommendations:

Expression SystemAdvantagesLimitationsBest Applications
E. coli BL21(DE3)High yield, economic, rapid growthLacks post-translational modifications, protein may form inclusion bodiesInitial characterization, structural studies
E. coli C41/C43Specialized for membrane proteinsLower yields than standard strainsWhen standard strains fail to express properly folded protein
Yeast (P. pastoris)Eukaryotic folding machinery, secretion possibleLonger development timeWhen proper folding is challenging in bacterial systems
Insect cellsAdvanced eukaryotic folding, post-translational modificationsExpensive, complex protocolsFunctional studies requiring proper modifications

For optimal expression, a codon-optimized synthetic gene design is recommended to account for the different codon usage between E. globulus and the expression host. Additionally, a polyhistidine tag is typically added to facilitate purification, with a TEV protease cleavage site for tag removal if necessary for structural or functional studies .

How does the atpF gene from E. globulus compare with other plant species?

The chloroplastic atpF gene from E. globulus shows notable characteristics when compared to other plant species:

These comparisons provide valuable insights into how evolutionary pressures have shaped the atpF gene in Eucalyptus, potentially contributing to its environmental adaptability.

What are the key considerations for designing experiments to assess the function of recombinant E. globulus atpF protein?

When designing experiments to evaluate the function of recombinant E. globulus atpF protein, researchers should consider a comprehensive approach that addresses both structural integrity and functional capacity:

Experimental design framework:

  • Protein quality assessment:

    • Circular dichroism spectroscopy to confirm secondary structure

    • Size exclusion chromatography to verify oligomeric state

    • Thermal shift assays to assess protein stability

  • Functional characterization:

    • ATPase activity assays (both synthesis and hydrolysis directions)

    • Reconstitution into liposomes to measure proton translocation

    • Proton gradient formation assays using pH-sensitive fluorescent dyes

  • Interaction studies:

    • Co-immunoprecipitation with other ATP synthase subunits

    • Surface plasmon resonance to quantify binding affinities

    • Cross-linking mass spectrometry to map interaction interfaces

  • Control experiments:

    • Parallel testing with known functional ATP synthase components

    • Site-directed mutagenesis of conserved residues as negative controls

    • Comparison with homologous proteins from model species

  • Environmental response:

    • Assessing function under varying pH, temperature, and ionic conditions

    • Examining responses to oxidative stress conditions

    • Testing function in the presence of potential regulatory molecules

This comprehensive experimental approach provides multiple lines of evidence for functional assessment while accounting for potential experimental artifacts .

What purification strategy would yield the highest quality recombinant E. globulus atpF protein?

Purification of membrane-associated proteins like atpF requires a specialized approach to maintain structural integrity and function. The following purification strategy is recommended:

Step-by-step purification protocol:

  • Cell lysis and membrane isolation:

    • Gentle cell disruption (sonication or French press)

    • Differential centrifugation to isolate membrane fractions

    • Careful separation of chloroplast membrane fractions if using a eukaryotic expression system

  • Detergent solubilization:

    • Screen multiple detergents (DDM, LMNG, digitonin) at various concentrations

    • Optimize temperature, time, and buffer conditions

    • Centrifugation to remove insoluble material

  • Affinity chromatography:

    • Immobilized metal affinity chromatography (IMAC) using His-tag

    • Gradient elution to separate weakly bound contaminants

    • Buffer composition containing appropriate detergent levels

  • Secondary purification:

    • Ion exchange chromatography to remove charged contaminants

    • Size exclusion chromatography for final polishing and buffer exchange

    • Optional: tag removal using TEV protease followed by reverse IMAC

  • Quality control:

    • SDS-PAGE and western blotting to confirm identity and purity

    • Mass spectrometry to verify protein integrity

    • Dynamic light scattering to assess homogeneity

This multi-step approach typically yields protein of >95% purity suitable for functional and structural studies, while maintaining the native conformation of the protein .

How can researchers effectively assess the integration of recombinant atpF into functional ATP synthase complexes?

Assessing the integration and functionality of recombinant atpF in ATP synthase complexes requires methods that probe both structural assembly and functional output:

Methodological approaches:

  • Co-expression systems:

    • Design expression vectors for co-expression of multiple ATP synthase subunits

    • Use dual-affinity tag systems for complex purification

    • Implement split reporter systems to monitor protein-protein interactions

  • Reconstitution experiments:

    • In vitro reconstitution of purified components

    • Liposome reconstitution with pH gradient monitoring

    • Nanodiscs formation for stabilization of membrane components

  • Functional assays:

    • ATP synthesis activity measurements using luciferin/luciferase

    • Proton pumping assays with pH-sensitive fluorophores

    • Rotational assays using single-molecule techniques

  • Structural verification:

    • Blue native PAGE to visualize intact complexes

    • Cryo-electron microscopy to resolve structural details

    • Cross-linking mass spectrometry to map subunit interfaces

  • Comparison metrics:

    • Activity normalization to complex concentration

    • Kinetic parameter determination (Vmax, Km)

    • Stability measurements under varying conditions

These approaches provide complementary data on both the structural integrity and functional capacity of ATP synthase complexes containing the recombinant atpF protein .

How might post-translational modifications affect the function of E. globulus atpF in response to environmental stress?

Post-translational modifications (PTMs) likely play crucial roles in regulating ATP synthase function in E. globulus, particularly under stress conditions:

Key post-translational modifications and their effects:

  • Phosphorylation:

    • Potential sites: Conserved Ser/Thr residues in the hydrophilic regions

    • Function: May regulate protein-protein interactions within the complex

    • Response: Likely increases under drought stress to modulate ATP synthesis rates

    • Methods for detection: Phosphoproteomic analysis, Pro-Q Diamond staining, phospho-specific antibodies

  • Acetylation:

    • Potential sites: Lys residues in soluble domains

    • Function: May influence protein stability and complex assembly

    • Response: Could be altered during temperature stress

    • Methods for detection: Mass spectrometry with acetyl-lysine enrichment

  • Oxidative modifications:

    • Potential sites: Cys, Met, and other oxidation-sensitive residues

    • Function: Sensors of redox state in the chloroplast

    • Response: Increase during oxidative stress conditions

    • Detection methods: Redox proteomics, differential alkylation

  • Proteolytic processing:

    • Function: Maturation of imported precursor proteins

    • Response: May be altered during stress to control protein turnover

    • Detection methods: N-terminal sequencing, mass spectrometry

Research data from other plant species suggests that drought stress triggers specific phosphorylation patterns in chloroplastic proteins that may help maintain energy balance during water limitation. E. globulus, with its notable drought tolerance, likely employs sophisticated PTM regulation of ATP synthase components including atpF .

What role might E. globulus atpF play in the species' remarkable drought tolerance?

The ATP synthase subunit b (atpF) likely contributes significantly to E. globulus drought tolerance through several mechanisms:

Mechanisms of drought tolerance contribution:

  • Energy homeostasis maintenance:
    During drought stress, plants face decreased photosynthetic capacity due to stomatal closure and reduced CO₂ availability. E. globulus ATP synthase components may have evolved specific adaptations to maintain ATP production under these conditions. Studies of drought-stressed Eucalyptus clones show distinctive photosynthetic characteristics that suggest specialized regulation of energy conversion processes .

  • Structural stability under stress:
    The atpF protein may contain adaptations that provide structural stability to the ATP synthase complex under water deficit conditions. This would allow continued function even as membrane properties change during dehydration .

  • Interaction with stress signaling pathways:
    Research data indicates that chloroplast proteins interact with drought stress signaling networks, potentially allowing rapid adjustment of energy metabolism in response to water limitation. E. globulus clones with superior drought tolerance show different patterns of photosynthetic limitation and recovery, suggesting specialized regulation at the chloroplast level .

  • Coordination with ROS management:
    During drought stress, reactive oxygen species (ROS) production increases. ATP synthase function must be coordinated with antioxidant systems to prevent damage. E. globulus extracts show significant antioxidant properties, including superoxide dismutase and catalase activities, which may protect ATP synthase components .

Experiments comparing drought-tolerant and drought-sensitive E. globulus clones revealed significant differences in photosynthetic parameters, electron transport rates, and recovery capacity. The ratio of electron transport rate to photosynthetic rate (ETR/A) is particularly informative as a screening tool for drought tolerance .

What experimental approaches can determine the structure-function relationship of E. globulus atpF in the context of the complete ATP synthase complex?

Understanding the structure-function relationship of E. globulus atpF requires integrative approaches that span from atomic resolution to whole-complex function:

Recommended experimental approaches:

  • Structural determination techniques:

    • X-ray crystallography of isolated domains

    • Cryo-electron microscopy of the full ATP synthase complex

    • NMR spectroscopy for dynamic regions

    • AlphaFold2 or RoseTTAFold prediction validated by experimental data

  • Molecular dynamics simulations:

    • All-atom simulations in membrane environments

    • Analysis of conformational changes during catalytic cycle

    • Identification of water molecules and ion pathways

    • Prediction of effects of sequence variations

  • Site-directed mutagenesis studies:

    • Systematic mutation of conserved residues

    • Creation of chimeric proteins with sequences from other species

    • Introduction of E. globulus-specific residues into model species

  • Biophysical characterization:

    • Hydrogen-deuterium exchange mass spectrometry to map flexible regions

    • Cross-linking mass spectrometry to identify interaction interfaces

    • Single-molecule FRET to measure conformational changes during catalysis

  • Functional correlation:

    • Structure-guided mutations with parallel activity measurements

    • Comparison between drought-tolerant and sensitive Eucalyptus species

    • Correlation of structural features with physiological responses

These approaches collectively provide a comprehensive understanding of how the unique structural features of E. globulus atpF contribute to its function and potential role in environmental adaptation .

How should researchers analyze and interpret contradictory data regarding recombinant E. globulus atpF function?

When faced with contradictory data about recombinant E. globulus atpF function, researchers should employ a systematic troubleshooting and validation approach:

Data contradiction resolution framework:

  • Evaluate experimental conditions:

    • Compare buffer compositions, pH, and ionic strength across experiments

    • Assess protein quality metrics (purity, oligomeric state, stability)

    • Review expression system differences that might affect protein folding

    • Consider detergent effects if working with membrane-associated forms

  • Technical validation:

    • Repeat critical experiments with internal controls

    • Use multiple complementary techniques to assess the same parameter

    • Implement statistical analysis appropriate for the data type

    • Consider biological versus technical replicates

  • Biological context consideration:

    • Evaluate if contradictions reflect natural isoform variations

    • Assess developmental or tissue-specific regulation possibilities

    • Consider post-translational modifications that may vary between preparations

    • Review physiological relevance of in vitro conditions

  • Cross-laboratory validation:

    • Implement standardized protocols across research groups

    • Exchange materials (plasmids, protein samples) between laboratories

    • Conduct blind testing of samples when possible

    • Document all experimental parameters thoroughly

  • Synthesis and reconciliation:

    • Develop models that may explain seemingly contradictory results

    • Design critical experiments to test these models

    • Consider if contradictions reflect different aspects of a complex function

    • Use quantitative approaches to weigh evidence

What statistical approaches are most appropriate for analyzing functional differences between wild-type and mutant E. globulus atpF variants?

The selection of appropriate statistical methods is crucial for robust analysis of functional differences between wild-type and mutant E. globulus atpF variants:

Recommended statistical approaches:

Data TypeAppropriate TestsSample Size ConsiderationsVisualization Methods
Enzymatic activity (continuous)- Paired t-test (for single mutations)
- ANOVA with post-hoc tests (for multiple variants)
- Mixed-effects models (for repeated measures)
Minimum n=5 biological replicates
Power analysis for effect size estimation
- Box plots with individual data points
- Activity distribution curves
- Heat maps for multiple conditions
Binding affinity measurements- Non-linear regression analysis
- AIC/BIC for model selection
- Bootstrap analysis for confidence intervals
Minimum 7-10 concentration points
3+ technical replicates
- Binding curves with residual plots
- Scatchard/Hill plots
- ΔG correlation plots
Stability measurements- Boltzmann equation fitting
- Survival analysis for time-dependent stability
- Non-parametric tests for non-normal distributions
Technical replicates at each temperature/condition
Multiple independent preparations
- Thermal denaturation curves
- Half-life plots
- Stability phase diagrams
Complex assembly efficiency- Chi-square tests for categorical outcomes
- Logistic regression for binary outcomes
- Proportional analysis
Quantification of multiple images/gels
Technical and biological replication
- Stacked bar charts
- Assembly pathway diagrams
- Interaction network visualizations

Additional considerations:

  • Apply appropriate corrections for multiple testing (e.g., Bonferroni, Benjamini-Hochberg)

  • Use Bayesian approaches when prior information is available

  • Implement multivariate analysis for data with multiple dependent variables

  • Consider machine learning approaches for complex datasets with multiple parameters

The integration of these statistical approaches provides rigorous assessment of functional differences while accounting for experimental variability .

How can researchers effectively integrate transcriptomic, proteomic, and functional data to understand the role of atpF in E. globulus stress responses?

Integration of multi-omics data provides comprehensive insights into how atpF functions within broader stress response networks in E. globulus:

Data integration methodology:

  • Correlation analysis across datasets:

    • Calculate Pearson or Spearman correlations between transcript and protein levels

    • Identify time-delayed correlations that may indicate regulatory relationships

    • Compare expression patterns across different stress conditions

    • Correlate molecular data with physiological measurements

  • Network construction:

    • Build protein-protein interaction networks from co-expression data

    • Identify regulatory motifs and feedback loops

    • Map metabolic pathways affected by atpF expression changes

    • Incorporate known stress response pathways

  • Functional enrichment analysis:

    • Gene Ontology (GO) enrichment of co-expressed genes

    • Pathway enrichment analysis of differentially expressed proteins

    • Transcription factor binding site enrichment in co-regulated genes

    • Metabolite set enrichment analysis for affected metabolic processes

  • Temporal and spatial mapping:

    • Track expression changes across time points during stress response

    • Map tissue-specific expression patterns

    • Correlate subcellular localization with function

    • Identify critical time points for functional transitions

  • Causal modeling:

    • Implement Bayesian network analysis to infer causal relationships

    • Use structural equation modeling to test hypothesized pathways

    • Apply Granger causality tests for time-series data

    • Develop predictive models of stress response outcomes

Research on Eucalyptus drought response has demonstrated that integrating measurements like photosynthetic rate (A), transpiration rate (E), electron transport rate/photosynthetic rate (ETR/A), and shoot dry matter/root dry matter (SDM/RDM) provides powerful insights into stress adaptation mechanisms. These physiological parameters can be directly linked to molecular data to establish mechanistic understanding .

What are the most reliable control experiments for validating recombinant E. globulus atpF function?

Establishing appropriate controls is essential for robust validation of recombinant E. globulus atpF function:

Essential control experiments:

  • Negative controls:

    • Non-functional mutant versions (site-directed mutations of catalytic residues)

    • Heat-denatured protein samples

    • Empty vector/expression system controls

    • Competitive inhibition with known ATP synthase inhibitors

  • Positive controls:

    • Well-characterized homologous proteins from model species

    • Native ATP synthase complexes isolated from E. globulus chloroplasts

    • Commercially available ATP synthase components when applicable

    • Reconstituted systems with known activity levels

  • Specificity controls:

    • Substrate specificity testing (ATP vs. other nucleotides)

    • Ion dependence (Mg²⁺, Ca²⁺, etc.)

    • pH and temperature response profiles

    • Detergent/lipid composition variations

  • System validation:

    • Complementation assays in knockout systems

    • In vitro transcription/translation controls

    • Activity correlation with protein concentration (linearity testing)

    • Time-course stability assessments

  • Technical validation:

    • Multiple protein preparation methods comparison

    • Different detection system validations

    • Inter-laboratory validation when possible

    • Method-specific controls (e.g., background luminescence in ATP assays)

These controls collectively establish specificity, sensitivity, and reproducibility, providing confidence in functional assignments and enabling accurate comparison between experimental conditions .

How can the study of recombinant E. globulus atpF contribute to understanding plant adaptation to climate change?

Research on E. globulus atpF provides valuable insights into plant energy metabolism adaptation under changing climate conditions:

Climate adaptation research applications:

  • Drought response mechanisms:
    The study of E. globulus atpF can reveal specialized adaptations that maintain energy production during water limitation. Eucalyptus species demonstrate remarkable drought tolerance, with distinctive physiological responses including altered photosynthetic parameters and root:shoot ratios. Understanding how ATP synthase components contribute to these adaptations could inform breeding strategies for drought-resistant crops .

  • Temperature adaptation:
    Climate change brings increased temperature extremes. E. globulus ATP synthase components may contain structural adaptations that maintain function across temperature ranges. Comparative studies between Eucalyptus species from different climate zones could reveal evolutionary adaptations in ATP synthase that contribute to thermal tolerance.

  • Carbon fixation efficiency:
    As atmospheric CO₂ levels rise, understanding the coordination between ATP production and carbon fixation becomes critical. E. globulus atpF research can illuminate how energy production is balanced with carbon assimilation under changing conditions.

  • Stress signaling integration:
    ATP synthase function is linked to broader stress response networks. Research data from Eucalyptus indicates that physiological parameters like ETR/A (electron transport rate/photosynthetic rate) can serve as powerful indicators of stress adaptation capacity, suggesting that energy conversion processes are central to climate resilience .

  • Evolutionary adaptation markers:
    Comparative analysis of atpF across Eucalyptus species and populations from different environments can reveal selection signatures associated with climate adaptation, providing molecular markers for climate resilience.

These applications demonstrate how fundamental research on E. globulus atpF contributes to our broader understanding of plant climate adaptation mechanisms .

What biotechnological applications might emerge from detailed characterization of E. globulus atpF?

Characterization of E. globulus atpF opens possibilities for various biotechnological applications:

Potential biotechnological applications:

  • Engineered energy efficiency:

    • Development of crops with optimized ATP synthase components

    • Engineering photosynthetic efficiency under stress conditions

    • Creation of plants with improved recovery from drought periods

    • Design of bioenergy crops with enhanced biomass production

  • Stress-responsive biosensors:

    • ATP synthase-based sensors for early stress detection

    • Monitoring systems for plant energy status in field conditions

    • Diagnostic tools for plant physiological state assessment

    • High-throughput screening platforms for stress tolerance

  • Pharmaceutical applications:

    • Drug development targeting ATP synthase for antimicrobial applications

    • Development of modulators for human ATP synthase disorders

    • Natural compounds from E. globulus as pharmaceutical leads

    • Structure-based drug design using plant ATP synthase models

  • Bioinspired materials:

    • Nanomotor design based on the rotary mechanism of ATP synthase

    • Self-assembling biomaterials mimicking ATP synthase structure

    • Energy-transducing artificial systems

    • Biomimetic membranes with incorporated energy-generating components

  • Bioremediation tools:

    • Engineered organisms with enhanced energy production for contaminant processing

    • Stress-resistant systems for challenging remediation environments

    • Biological sensors for environmental monitoring

    • Energy-efficient bioremediation processes

Research on E. globulus extracts has already demonstrated significant bioactive properties, including antioxidant and anti-inflammatory effects that could translate into therapeutic applications .

What are the most common challenges in recombinant expression of chloroplastic atpF, and how can researchers overcome them?

Recombinant expression of chloroplastic membrane proteins like atpF presents several challenges that researchers should anticipate and address:

Common challenges and solutions:

ChallengeManifestationSolution StrategiesSuccess Indicators
Protein toxicity to host- Poor growth
- Plasmid instability
- Mutation of target gene
- Use tightly regulated expression systems
- Lower induction levels
- Try specialized host strains (C41/C43)
- Consider cell-free expression systems
- Stable growth curves
- Plasmid stability
- Verified sequence integrity
Inclusion body formation- Insoluble protein fraction
- Aggregation during purification
- Poor activity recovery
- Lower expression temperature (18-20°C)
- Co-express molecular chaperones
- Optimize induction conditions
- Add solubilizing agents (glycerol, arginine)
- Increased soluble fraction
- Homogeneous size distribution
- Functional activity
Improper membrane insertion- Poor membrane association
- Incorrect topology
- Loss of function
- Use specialized membrane protein expression vectors
- Express with natural binding partners
- Try eukaryotic expression systems
- Optimize membrane-mimetic environments
- Proper membrane localization
- Correct orientation
- Functional tests in membrane environment
Proteolytic degradation- Multiple bands on SDS-PAGE
- Loss of protein during purification
- C-terminal truncations
- Add protease inhibitors throughout purification
- Use protease-deficient host strains
- Optimize buffer conditions
- Consider fusion partners that enhance stability
- Single band on SDS-PAGE
- Mass spec verification of intact protein
- Consistent yields
Poor yield- Low expression levels
- Losses during purification
- Insufficient for analysis
- Codon optimization for expression host
- Scale up culture volume
- Optimize induction parameters
- Consider alternate expression systems
- Improve purification efficiency
- Protein visible on Coomassie-stained gels
- Yields >1 mg/L culture
- Consistent batch-to-batch recovery

Additional methodology considerations include:

  • Testing multiple detergents for optimal solubilization and stability

  • Incorporating lipids during purification to stabilize membrane domains

  • Using nanodiscs or other membrane mimetics for functional studies

  • Implementing high-throughput small-scale expression tests to optimize conditions

Addressing these challenges systematically increases the likelihood of successful recombinant atpF production suitable for functional and structural studies .

How can researchers distinguish between genuine functional properties of E. globulus atpF and artifacts of the recombinant expression system?

Distinguishing intrinsic properties from artifacts requires systematic controls and validation approaches:

Validation strategies:

  • Comparative expression systems:

    • Express the same protein in multiple systems (bacterial, yeast, insect cells)

    • Compare functional properties across expression platforms

    • Identify consistent characteristics versus system-dependent variations

    • Use native E. globulus chloroplast preparations as reference

  • Protein modification analysis:

    • Compare post-translational modifications between recombinant and native proteins

    • Assess impact of tags on function and interactions

    • Evaluate effects of detergents versus native lipid environment

    • Test activity before and after tag removal

  • Functional context restoration:

    • Reconstitute with native binding partners

    • Test function in liposomes with chloroplast lipid composition

    • Compare kinetics in different membrane environments

    • Evaluate proton gradient sensitivity in reconstituted systems

  • Mutational validation:

    • Introduce carefully selected mutations to test mechanism hypotheses

    • Confirm structure-function relationships through systematic changes

    • Restore activity of inactive mutants through compensatory mutations

    • Use evolutionary conservation patterns to guide mutation design

  • Heterologous complementation:

    • Test functional complementation in model organisms

    • Evaluate rescue of phenotypes in knockout systems

    • Compare complementation efficiency with orthologs from other species

    • Assess species-specific functional properties in controlled backgrounds

What specialized techniques are required for studying the interaction of recombinant E. globulus atpF with other ATP synthase subunits?

Studying protein-protein interactions within the ATP synthase complex requires specialized techniques appropriate for membrane protein systems:

Specialized interaction analysis techniques:

  • Co-purification approaches:

    • Tandem affinity purification with differentially tagged subunits

    • Sequential pull-down assays to identify stable subcomplexes

    • Chemical cross-linking followed by purification

    • Quantitative assessment of stoichiometry in purified complexes

  • Advanced imaging methods:

    • Single-particle cryo-electron microscopy

    • Super-resolution microscopy for in situ localization

    • Electron tomography of membrane-embedded complexes

    • Atomic force microscopy for topographical analysis

  • Biophysical interaction analysis:

    • Microscale thermophoresis in detergent micelles or nanodiscs

    • Biolayer interferometry with immobilized components

    • Isothermal titration calorimetry for thermodynamic parameters

    • Surface plasmon resonance for kinetic measurements

  • Proximity-based methods:

    • FRET/BRET assays for interaction dynamics

    • Split fluorescent protein complementation

    • Proximity labeling (BioID, APEX) to map interaction neighborhoods

    • In situ proximity ligation assay for native tissue analysis

  • Mass spectrometry approaches:

    • Cross-linking mass spectrometry (XL-MS) to map interaction interfaces

    • Hydrogen-deuterium exchange MS to identify protected regions

    • Native MS to determine complex stoichiometry and stability

    • Protein correlation profiling across purification fractions

These techniques provide complementary information about interaction specificities, affinities, dynamics, and structural context within the ATP synthase complex .

What emerging technologies might advance our understanding of E. globulus atpF structure and function?

Several cutting-edge technologies show promise for deeper insights into E. globulus atpF biology:

Emerging research technologies:

  • Advanced structural biology approaches:

    • Cryo-electron tomography for in situ structural analysis

    • Integrative structural biology combining multiple data types

    • Microcrystal electron diffraction for challenging proteins

    • Time-resolved structural methods to capture dynamics

  • Single-molecule techniques:

    • High-speed AFM to visualize conformational changes

    • Magnetic tweezers to measure mechanical properties

    • Single-molecule FRET to track conformational states

    • Nanopore analysis of membrane protein insertion

  • Advanced computational methods:

    • AI-assisted protein structure prediction and validation

    • Quantum mechanics/molecular mechanics simulations

    • Long-timescale molecular dynamics with specialized hardware

    • Network analysis integrating multiple biological datasets

  • Genome engineering approaches:

    • CRISPR-based editing of chloroplast genomes

    • In vivo structure-function studies using precise mutations

    • Directed evolution of ATP synthase components

    • Synthetic biology redesign of energy conversion systems

  • Multi-omics integration:

    • Spatial transcriptomics to map expression patterns

    • Activity-based protein profiling in intact systems

    • Metabolic flux analysis to track energy conversion pathways

    • Systems biology modeling of energy metabolism networks

These technologies collectively promise to provide unprecedented insights into the molecular details and physiological context of atpF function in E. globulus and other plants .

How might comparative studies across Eucalyptus species enhance our understanding of atpF evolution and specialization?

Comparative studies across Eucalyptus species provide valuable evolutionary context for atpF function:

Comparative research approaches:

  • Evolutionary analysis:

    • Phylogenetic analysis of atpF sequences across Eucalyptus species

    • Identification of selection signatures in different environments

    • Correlation of sequence variations with habitat conditions

    • Dating of adaptive mutations using molecular clock approaches

  • Structure-function correlations:

    • Mapping species-specific variations onto structural models

    • Identifying co-evolving residues that maintain function

    • Correlating unique adaptations with environmental niches

    • Reconstructing ancestral sequences to trace functional evolution

  • Physiological context:

    • Comparing ATP synthase activity across species with different stress tolerances

    • Correlating atpF variations with photosynthetic parameters

    • Examining species differences in response to controlled stresses

    • Linking molecular variations to whole-plant physiological traits

  • Hybridization studies:

    • Analysis of atpF in natural and artificial hybrids

    • Assessment of chloroplast contribution to hybrid vigor

    • Tracking inheritance patterns of chloroplast genes

    • Examining nuclear-chloroplast interactions across species

  • Environmental adaptation:

    • Field studies correlating genetic variations with performance

    • Common garden experiments to isolate genetic components

    • Climate matching analysis for adaptive trait identification

    • Predictive modeling of species responses to climate change

Existing research on Eucalyptus drought tolerance has already demonstrated significant clone-specific responses in physiological parameters, suggesting genetic variation in energy metabolism pathways that likely includes adaptations in ATP synthase components .

What interdisciplinary approaches might yield new insights into the role of ATP synthase in plant stress adaptation?

Interdisciplinary research approaches offer promising avenues for deeper understanding of ATP synthase in plant stress adaptation:

Interdisciplinary research strategies:

  • Integration of engineering and plant biology:

    • Biosensor development for real-time monitoring of ATP synthase activity

    • Microfluidic systems for controlled microenvironment studies

    • Automated phenotyping platforms for large-scale comparative studies

    • Biomimetic systems inspired by plant energy conversion mechanisms

  • Computational biology and ecology:

    • Ecological niche modeling integrated with molecular data

    • Machine learning approaches to identify patterns in multi-omics data

    • Network analysis linking molecular mechanisms to ecosystem processes

    • Multi-scale modeling from molecules to ecosystems

  • Medical research crossover:

    • Comparative analysis of plant and human ATP synthase disorders

    • Drug discovery based on plant-derived ATP synthase modulators

    • Translational research on shared stress response mechanisms

    • Therapeutic applications of Eucalyptus bioactive compounds

  • Agricultural science integration:

    • Field-deployable diagnostic tools based on energy metabolism markers

    • Breeding strategies targeting ATP synthase optimization

    • Crop management practices informed by energy efficiency metrics

    • Stress priming approaches based on ATP synthase regulation

  • Climate science collaboration:

    • Integration of molecular mechanisms into climate response models

    • Development of early warning systems for plant stress

    • Predictive modeling of species range shifts based on energy metabolism

    • Climate adaptation strategies informed by molecular understanding

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