Recombinant Shewanella sediminis Elongation factor Tu (tuf)

What is the structure and function of Elongation factor Tu in Shewanella sediminis?

Elongation factor Tu (EF-Tu) in Shewanella sediminis is a highly conserved GTP-binding protein essential for bacterial protein synthesis. The protein spans 394 amino acids (expression region 1-394) and functions by delivering aminoacyl-tRNAs to the ribosome during translation elongation . Within the context of Shewanella sediminis (a species isolated from marine sediment with explosive-degrading capabilities), EF-Tu maintains the core function of translation elongation while potentially exhibiting species-specific adaptations related to the organism's unique environmental niche . The protein structure consists of three distinct domains: the GTP-binding domain (Domain I), and two β-barrel domains (Domains II and III) that facilitate interactions with aminoacyl-tRNAs and the ribosome.

Structurally, EF-Tu undergoes significant conformational changes during the GTP/GDP cycle, which are critical for its proper functioning in the translation process. These conformational changes are conserved across bacterial species, including Shewanella sediminis, and represent a fundamental aspect of bacterial protein synthesis machinery.

How is recombinant Shewanella sediminis EF-Tu typically expressed and purified for research purposes?

Recombinant Shewanella sediminis EF-Tu is typically expressed in Escherichia coli expression systems using vectors that incorporate the tuf gene sequence (encoding amino acids 1-394) . The expression methodology generally involves:

• PCR amplification of the tuf gene from Shewanella sediminis genomic DNA

• Cloning into an appropriate expression vector with a fusion tag (commonly His-tag)

• Transformation into an E. coli expression strain (BL21(DE3) or similar)

• Induction of protein expression using IPTG or auto-induction systems

• Cell lysis and protein purification using affinity chromatography

For purification, immobilized metal affinity chromatography (IMAC) is most commonly employed when the protein contains a His-tag. This is often followed by size exclusion chromatography to ensure high purity. The purified protein should be stored in appropriate buffer conditions, and repeated freezing and thawing should be avoided to maintain activity . For long-term storage, small aliquots at -80°C are recommended to prevent degradation.

What are the optimal storage conditions for maintaining the stability of recombinant Shewanella sediminis EF-Tu?

Optimal storage conditions for recombinant Shewanella sediminis EF-Tu involve careful consideration of buffer composition, temperature, and handling practices. Based on standard practices for similar proteins and available information:

• Temperature: Store at -80°C for long-term preservation

• Buffer composition: Typically in Tris-HCl (pH 7.5-8.0), containing:

  • 100-150 mM NaCl

  • 1-5 mM DTT or 2-mercaptoethanol (reducing agents)

  • 5-10% glycerol (cryoprotectant)

  • Optional: 0.1 mM EDTA to chelate metal ions

Importantly, repeated freezing and thawing cycles significantly reduce protein activity and should be strictly avoided . For working stocks, maintain aliquots at 4°C for no more than 1-2 weeks. The presence of stabilizing agents like glycerol helps prevent degradation during freeze-thaw cycles when they cannot be avoided.

How can researchers use recombinant Shewanella sediminis EF-Tu in structural biology studies?

Researchers can employ several methodologies to investigate the structural properties of recombinant Shewanella sediminis EF-Tu:

X-ray Crystallography Protocol:

• Purify the protein to >95% homogeneity using a combination of affinity chromatography and size exclusion chromatography

• Concentrate the protein to 10-15 mg/ml in a suitable buffer (typically containing 20 mM Tris-HCl pH 7.5, 100 mM NaCl, 5 mM MgCl₂, 1 mM DTT)

• Perform crystallization screening using commercial kits and the sitting drop vapor diffusion method

• Optimize promising crystallization conditions by varying parameters such as protein concentration, pH, and precipitant concentration

• For co-crystallization with GTP/GDP, include 1-2 mM of the nucleotide in the protein solution

• Collect diffraction data at a synchrotron facility

• Process data and solve the structure through molecular replacement using known EF-Tu structures as templates

Cryo-EM Studies:
For investigating EF-Tu in complex with ribosomes or other translation factors, cryo-electron microscopy offers advantages over crystallography. Sample preparation would involve:

• Prepare ribosome complexes with EF-Tu at a concentration of 50-100 nM

• Apply the sample to glow-discharged grids

• Vitrify by plunging into liquid ethane using an automated plunger

• Image using a high-end transmission electron microscope equipped with a direct electron detector

• Process images using software packages such as RELION or cryoSPARC

This structural information would provide insights into how Shewanella sediminis EF-Tu might have evolved specific adaptations related to the organism's environmental conditions, potentially revealing unique features compared to EF-Tu from other bacterial species.

What comparative genomic approaches can reveal the evolutionary significance of EF-Tu in Shewanella sediminis relative to other Shewanella species?

Evolutionary analysis of EF-Tu across Shewanella species can reveal important adaptations and conservation patterns. The following comprehensive approach is recommended:

Methodological Framework:

• Sequence Retrieval and Alignment:

  • Extract tuf gene sequences from the Shewanella sediminis genome and other Shewanella species

  • Include reference sequences from other genera for outgroup comparison

  • Perform multiple sequence alignment using MUSCLE or MAFFT algorithms

  • Refine alignments manually to ensure proper codon positioning

• Phylogenomic Analysis:

  • Construct phylogenetic trees using Maximum Likelihood or Bayesian approaches

  • Apply appropriate nucleotide or amino acid substitution models based on data characteristics

  • Assess node support using bootstrap or posterior probability approaches

  • Compare EF-Tu phylogeny with whole-genome phylogeny to detect potential horizontal gene transfer events

• Selection Pressure Analysis:

  • Calculate dN/dS ratios to identify signatures of positive, negative, or neutral selection

  • Apply site-specific selection models to identify specific amino acid positions under selection

  • Correlate selected sites with functional domains of the EF-Tu protein

• Structural Mapping:

  • Map conserved and variable regions onto the predicted 3D structure

  • Identify potential structure-function relationships specific to Shewanella sediminis

How can recombinant Shewanella sediminis EF-Tu be used as a model to study bacterial adaptation to extreme environmental conditions?

Shewanella sediminis was isolated from marine sediment and possesses unique adaptations for degrading explosives like RDX (hexahydro-1,3,5-trinitro-1,3,5-triazine) . Studying its EF-Tu can provide insights into protein adaptations to these specialized environments:

Experimental Approach:

• Thermal Stability Analysis:

  • Compare thermal denaturation profiles of EF-Tu from Shewanella sediminis with EF-Tu from mesophilic bacteria using differential scanning fluorimetry

  • Measure activity at different temperatures using GTP hydrolysis assays

  • Correlate stability differences with amino acid variations

• Functional Assays Under Varying Conditions:

  • Test EF-Tu GTPase activity under different salinity levels, reflecting marine adaptation

  • Assess translation efficiency in reconstituted in vitro translation systems under varying pH and pressure conditions

  • Compare kinetic parameters (Km, kcat) under standard versus marine-mimicking conditions

• Structural Stability in Presence of Environmental Stressors:

  • Examine conformational changes under oxidative stress conditions using circular dichroism

  • Determine the impact of heavy metals and pollutants (relevant to sediment environments) on protein function

  • Analyze how the presence of explosive compounds affects protein stability and activity

• Comparative Analysis with Other Shewanella Species:

  • Create a functional profile comparing EF-Tu from Shewanella sediminis with closely related species like Shewanella baltica and Shewanella hafniensis

  • Correlate functional differences with the ecological niches of each species

This research would contribute to understanding how essential proteins like EF-Tu maintain functionality while adapting to specialized environmental conditions, potentially revealing adaptations that contribute to Shewanella sediminis' metabolic versatility in contaminated marine sediments.

What are the common challenges in expressing and purifying active recombinant Shewanella sediminis EF-Tu, and how can they be addressed?

Researchers working with recombinant Shewanella sediminis EF-Tu often encounter several challenges during expression and purification. Here are the most common issues and their solutions:

Challenge 1: Poor Solubility

• Cause: Incorrect folding or formation of inclusion bodies

• Solutions:

  • Optimize expression temperature (lower to 16-18°C)

  • Use solubility-enhancing fusion tags (MBP, SUMO)

  • Co-express with chaperones like GroEL/GroES

  • Add solubility enhancers to the growth medium (sorbitol, glycine betaine)

  • Try auto-induction media instead of IPTG induction

Challenge 2: Low Activity After Purification

• Cause: Loss of GTP/GDP or magnesium cofactor, oxidation

• Solutions:

  • Include 1-5 mM MgCl₂ in all purification buffers

  • Add 0.1-1 mM GDP/GTP in purification buffers

  • Include reducing agents (DTT or TCEP) in all buffers

  • Avoid repeated freeze-thaw cycles

  • Maintain protein at 4°C during purification

Challenge 3: Degradation During Purification

• Cause: Protease activity or inherent instability

• Solutions:

  • Add protease inhibitor cocktail during lysis

  • Perform purification at 4°C

  • Add 5-10% glycerol to stabilize protein

  • Use E. coli BL21(DE3) pLysS or protease-deficient strains

  • Optimize buffer pH (typically 7.5-8.0 works best)

Challenge 4: Co-purification of Contaminants

• Cause: Non-specific binding to affinity resin or formation of complexes

• Solutions:

  • Include low concentrations of imidazole (10-20 mM) in binding buffer

  • Add additional purification steps (ion exchange, size exclusion)

  • Increase salt concentration (up to 300-500 mM NaCl) in wash buffers

  • Consider on-column refolding if working with inclusion bodies

Implementation of these strategies significantly improves the yield and activity of purified recombinant Shewanella sediminis EF-Tu, facilitating downstream applications and analyses.

How can researchers design experiments to investigate the role of EF-Tu in Shewanella sediminis' unique metabolic capabilities?

Shewanella sediminis possesses unique metabolic capabilities, particularly in explosive degradation and adaptation to marine sediment environments . While EF-Tu is primarily a translation factor, its potential moonlighting functions and role in cellular adaptation can be investigated through these experimental approaches:

Experimental Design Framework:

• In vivo Studies Using Genetic Manipulation:

  • Create a conditional knockdown of the tuf gene using inducible antisense RNA

  • Engineer strains with modified EF-Tu (site-directed mutagenesis of key residues)

  • Use reporter systems (e.g., luciferase) fused to stress-response promoters to monitor cellular responses

  • Compare growth and metabolic profiles under standard and stress conditions

• Protein-Protein Interaction Studies:

  • Perform pull-down assays using tagged recombinant EF-Tu to identify interaction partners

  • Use bacterial two-hybrid systems to screen for specific interactions

  • Conduct co-immunoprecipitation followed by mass spectrometry to identify the EF-Tu interactome

  • Compare interactome under standard conditions versus explosive-degrading conditions

• Transcriptomic and Proteomic Analysis:

  • Compare gene expression profiles between wild-type and EF-Tu modified strains

  • Analyze the impact of EF-Tu modifications on the global proteome

  • Focus on changes in expression of genes involved in explosive degradation pathways

  • Investigate relationships to the PrpR regulon, which has been identified in Shewanella sediminis

• Metabolic Flux Analysis:

  • Use isotope-labeled substrates to track metabolic fluxes in wild-type versus EF-Tu modified strains

  • Focus on pathways involved in explosive compound degradation

  • Measure key metabolites using LC-MS/MS

  • Develop metabolic models incorporating translation efficiency parameters

These approaches would help elucidate whether EF-Tu in Shewanella sediminis has evolved specific adaptations that contribute to the organism's specialized metabolism, potentially revealing novel moonlighting functions beyond its canonical role in translation.

What analytical techniques are most effective for characterizing the post-translational modifications of Shewanella sediminis EF-Tu?

Post-translational modifications (PTMs) can significantly impact EF-Tu function, potentially contributing to its adaptation in Shewanella sediminis. The following analytical workflow provides a comprehensive approach to characterizing these modifications:

Recommended Analytical Workflow:

• Sample Preparation:

  • Extract native EF-Tu from Shewanella sediminis under different growth conditions

  • Compare with recombinant EF-Tu expressed in E. coli

  • Perform gentle protein extraction to preserve labile modifications

  • Enrich for EF-Tu using immunoprecipitation or affinity chromatography

• Mass Spectrometry-Based Characterization:

  • Bottom-up Proteomics:

    • Digest protein with trypsin and other proteases for complementary coverage

    • Analyze peptides using LC-MS/MS with HCD and ETD fragmentation

    • Use data-dependent and data-independent acquisition methods

  • Top-down Proteomics:

    • Analyze intact protein to determine the combinatorial pattern of modifications

    • Use high-resolution mass spectrometers (Orbitrap or FTICR)

    • Apply electron capture dissociation for fragmentation while preserving PTMs

• Specific PTM Enrichment Strategies:

  • Phosphorylation: TiO₂ or IMAC enrichment followed by LC-MS/MS

  • Methylation and acetylation: Antibody-based enrichment

  • Glycosylation: Lectin affinity chromatography or hydrazide chemistry

• Data Analysis Pipeline:

  • Use multiple search engines (Mascot, SEQUEST, MaxQuant) for comprehensive identification

  • Apply site localization algorithms to pinpoint exact modification sites

  • Perform manual validation of key PTM-containing spectra

  • Quantify modification stoichiometry using label-free or labeled approaches

• Functional Validation:

  • Generate site-specific mutants (modification-mimicking or modification-preventing)

  • Assess impact on protein activity, stability, and interactions

  • Correlate modifications with environmental conditions and growth phases

This comprehensive approach would reveal how PTMs contribute to EF-Tu function in Shewanella sediminis, potentially uncovering modifications that are unique to this species and relate to its environmental adaptations.

How does the genetic context of the tuf gene in Shewanella sediminis compare with other Shewanella species, and what insights does this provide about its evolution?

The genetic context of the tuf gene can provide valuable insights into evolutionary processes and functional relationships. For Shewanella sediminis, a comparative genomic analysis reveals:

Methodological Approach:

• Synteny Analysis:

  • Extract the genomic neighborhood (±10 kb) of the tuf gene from Shewanella sediminis

  • Compare with syntenic regions in related species including Shewanella baltica, Shewanella hafniensis, and Shewanella septentrionalis

  • Use tools like Mauve or progressiveMauve for visualization of syntenic blocks

  • Identify conserved gene clusters and disruptions

• Operon Structure Investigation:

  • Determine if the tuf gene is part of a larger operon (commonly with elongation factor G)

  • Compare transcriptional units across Shewanella species

  • Identify potential species-specific regulatory elements

  • Analyze conservation of promoter and terminator sequences

• Mobile Genetic Element Assessment:

  • Examine the presence of insertion sequences, transposons, or prophages near the tuf gene

  • Determine if the tuf gene shows evidence of horizontal gene transfer (HGT)

  • Compare with genomic islands identified in Shewanella sediminis

• Copy Number Analysis:

  • Determine if multiple copies of tuf exist in Shewanella sediminis

  • Compare with other Shewanella species and analyze evolutionary implications

  • Assess functional divergence if multiple copies are present

Expected Findings:

Based on comparative genomic analyses of Shewanella species, we would expect to find that the tuf gene is highly conserved in sequence and context across the genus, reflecting its essential function . The gene is likely positioned within a ribosomal protein operon or str operon, as is common in bacteria. While the core function is preserved, the regulatory elements and genetic neighborhood may show adaptations specific to the explosive-degrading niche of Shewanella sediminis .

The genomic context analysis would also reveal whether the tuf gene in Shewanella sediminis shows any evidence of involvement with the species' accessory genome elements, such as genomic islands or mobile genetic elements, which could provide insights into the adaptive evolution of this translation factor in response to environmental pressures.

What insights can structural comparisons between EF-Tu from Shewanella sediminis and other bacteria provide about functional adaptations?

Structural comparisons of EF-Tu across bacterial species can reveal important adaptations that contribute to functional differences and environmental specialization. For Shewanella sediminis EF-Tu, the following methodological approach would yield valuable insights:

Structural Comparison Methodology:

• Homology Modeling and Structural Prediction:

  • Generate a high-quality structural model of Shewanella sediminis EF-Tu using homology modeling

  • Use multiple templates from closely related structures

  • Validate model quality using MolProbity, PROCHECK, and energy minimization

  • Compare with experimental structures if available

• Comparative Structural Analysis:

  • Superimpose the Shewanella sediminis EF-Tu structure with:

    • EF-Tu from other Shewanella species

    • EF-Tu from model organisms (E. coli, B. subtilis)

    • EF-Tu from bacteria adapted to similar environments

  • Calculate RMSD values for global and domain-specific comparisons

  • Identify regions with significant structural deviations

• Functional Site Analysis:

  • Map and compare:

    • GTP/GDP binding pocket architecture

    • tRNA interaction surfaces

    • Ribosome binding interfaces

    • Potential post-translational modification sites

  • Analyze electrostatic surface potential differences

  • Examine hydrophobic core packing and stability determinants

• Molecular Dynamics Simulations:

  • Simulate protein dynamics under various conditions:

    • Standard physiological conditions

    • Marine sediment-mimicking conditions (high salt, presence of pollutants)

    • Different temperature regimes

  • Analyze conformational flexibility, domain movements, and allosteric pathways

  • Compare simulated dynamics across species to identify adaptation-related differences

Expected Structural Adaptations:

Based on Shewanella sediminis' habitat and metabolic capabilities, structural comparisons would likely reveal:

• Surface residue adaptations promoting stability in marine sediment environments

• Potential alterations in flexibility of the tRNA binding domain

• Modified interdomain interactions affecting the GTP/GDP cycle

• Adaptation-specific surface patches potentially involved in species-specific protein-protein interactions

These structural insights would provide a molecular basis for understanding how EF-Tu contributes to Shewanella sediminis' adaptation to its ecological niche while maintaining its essential function in translation.

How can recombinant Shewanella sediminis EF-Tu be utilized in biotechnological applications related to environmental bioremediation?

Shewanella sediminis' capacity for degrading explosives and adapting to contaminated environments makes its proteins, including EF-Tu, interesting candidates for biotechnological applications in bioremediation . The following approaches outline how recombinant Shewanella sediminis EF-Tu could be utilized:

Biotechnological Applications Framework:

• Biosensor Development:

  • Engineer EF-Tu-based biosensors for detecting environmental contaminants:

    • Conjugate EF-Tu with fluorescent reporters to detect conformational changes

    • Develop assays where EF-Tu activity or stability is affected by specific pollutants

    • Create immobilized EF-Tu systems for field-deployable detection platforms

  • Validation protocol would include sensitivity and specificity testing in complex environmental matrices

• Enhancing Bioremediation Capacity:

  • Create engineered microorganisms with modified EF-Tu to enhance translation efficiency under stress conditions

  • Design EF-Tu variants with improved stability in contaminated environments

  • Develop expression systems where EF-Tu is co-expressed with key bioremediation enzymes to improve their production and function

  • Optimization would involve directed evolution approaches targeting EF-Tu performance

• Cell-Free Bioremediation Systems:

  • Develop cell-free protein synthesis platforms incorporating Shewanella sediminis EF-Tu

  • Produce bioremediation enzymes in vitro under conditions prohibitive to living cells

  • Create immobilized translation systems for continuous production of degradative enzymes

  • Performance metrics would include enzyme production rates and stability in environmental conditions

• Protein Engineering Platform:

  • Use knowledge of EF-Tu structure-function relationships to design more robust translation systems

  • Engineer chimeric EF-Tu proteins combining features from different Shewanella species

  • Apply rational design principles to create EF-Tu variants with enhanced properties

  • Testing would involve comparative translation efficiency assays under varying conditions

These applications would leverage the natural adaptations of Shewanella sediminis EF-Tu to create biotechnological tools specifically suited for environmental remediation of contaminated marine sediments and explosive-containing sites.

What methodological considerations should researchers address when studying the role of EF-Tu in Shewanella sediminis' adaptation to environmental stressors?

Investigating EF-Tu's role in environmental adaptation requires careful methodological considerations to account for the complex interplay between protein function and environmental conditions. The following comprehensive methodology addresses key considerations:

Methodological Framework:

• Experimental Design Considerations:

  • Physiologically Relevant Conditions:

    • Culture Shewanella sediminis under conditions mimicking its natural habitat

    • Include appropriate controls (standard conditions, related Shewanella species)

    • Design gradient experiments to identify adaptation thresholds

    • Consider mixed stressor experiments (combinations of temperature, pressure, pollutants)

  • Temporal Dynamics:

    • Design time-course experiments to capture adaptation processes

    • Monitor acute versus chronic stress responses

    • Include recovery phases to assess reversibility of adaptations

• Multi-Omics Integration Strategy:

  • Transcriptomics:

    • RNA-Seq to monitor tuf gene expression under different stressors

    • Analyze co-expression networks to identify stress-response pathways

    • Compare with expression patterns of genes in the PrpR regulon

  • Proteomics:

    • Quantitative proteomics to measure EF-Tu abundance and modifications

    • Analyze translation efficiency using ribosome profiling

    • Identify protein interaction networks under stress conditions

  • Metabolomics:

    • Monitor metabolic shifts associated with EF-Tu perturbations

    • Link translation efficiency to metabolic adaptation

    • Identify specific metabolites associated with stress resistance

• Functional Validation Approaches:

  • Genetic Manipulation:

    • Create point mutations in the tuf gene to disrupt specific functions

    • Complement with wild-type or variant tuf genes

    • Use controlled expression systems to titrate EF-Tu levels

  • Biochemical Characterization:

    • Measure EF-Tu activity under various stress conditions

    • Determine kinetic parameters of GTP hydrolysis

    • Assess tRNA binding affinity under different environmental conditions

• Comparative Analysis Framework:

  • Compare responses across:

    • Different Shewanella species (S. sediminis, S. baltica, S. hafniensis)

    • EF-Tu variants with specific mutations

    • Different environmental stressors

This integrated methodological approach would provide a comprehensive understanding of how EF-Tu contributes to Shewanella sediminis' environmental adaptations, while addressing potential confounding factors and ensuring physiological relevance of the findings.

What are the current gaps in understanding Shewanella sediminis EF-Tu, and what research directions would address these gaps?

Despite the importance of EF-Tu in bacterial physiology and potential applications of Shewanella sediminis in bioremediation, several knowledge gaps remain. The following research directions would significantly advance understanding of this protein:

Key Knowledge Gaps and Research Recommendations:

• Structural Characterization:

  • Gap: Lack of experimentally determined structure of Shewanella sediminis EF-Tu

  • Recommendation: Obtain high-resolution crystal structures of EF-Tu in different nucleotide-bound states and in complex with tRNA/ribosome components

  • Approach: Use cryo-EM for capturing dynamic states and X-ray crystallography for atomic resolution details

  • Expected Impact: Would reveal unique structural adaptations compared to other bacterial EF-Tu proteins

• Environmental Adaptation Mechanisms:

  • Gap: Limited understanding of how EF-Tu contributes to Shewanella sediminis' adaptation to its unique ecological niche

  • Recommendation: Conduct comparative studies of EF-Tu function under conditions mimicking marine sediments containing explosive compounds

  • Approach: Combine in vitro translation assays with molecular dynamics simulations under varying environmental conditions

  • Expected Impact: Would connect molecular adaptations to ecological specialization

• Post-Translational Modification Landscape:

  • Gap: Unknown PTM patterns specific to Shewanella sediminis EF-Tu

  • Recommendation: Perform comprehensive PTM mapping across growth conditions and stress responses

  • Approach: Integrate top-down and bottom-up proteomics with site-specific mutagenesis studies

  • Expected Impact: Would reveal how PTMs regulate EF-Tu function in response to environmental signals

• Regulatory Networks:

  • Gap: Limited knowledge of how tuf gene expression is regulated in Shewanella sediminis

  • Recommendation: Characterize the transcriptional and post-transcriptional regulation of the tuf gene

  • Approach: Combine promoter analysis, RNA-Seq, and reporter assays to identify regulatory elements and factors

  • Expected Impact: Would connect EF-Tu to broader stress response networks, including potential relationships with the PrpR regulon

• Evolutionary Trajectory:

  • Gap: Unclear evolutionary history of the tuf gene in Shewanella sediminis relative to other Shewanella species

  • Recommendation: Conduct comprehensive phylogenomic analysis within the context of the recently defined Shewanella species complex

  • Approach: Integrate genome-wide and gene-specific evolutionary analyses

  • Expected Impact: Would reveal selective pressures and potential horizontal gene transfer events shaping EF-Tu evolution

Addressing these research directions would significantly advance understanding of how this essential protein contributes to Shewanella sediminis' unique capabilities while potentially yielding insights applicable to biotechnology and bioremediation applications.

How can researchers effectively integrate structural, functional, and evolutionary studies of Shewanella sediminis EF-Tu to gain comprehensive insights?

An integrated research approach combining structural, functional, and evolutionary perspectives would provide the most comprehensive understanding of Shewanella sediminis EF-Tu. The following framework outlines an effective integration strategy:

Integrated Research Framework:

• Structural-Functional Integration:

  • Map sequence variations to structural elements and predict functional impacts

  • Correlate structural features with biochemical properties through mutagenesis studies

  • Use structure-guided approaches to engineer EF-Tu variants with altered properties

  • Apply molecular dynamics simulations to connect structural differences to functional adaptations

• Functional-Evolutionary Integration:

  • Perform ancestral sequence reconstruction to trace the evolutionary trajectory of EF-Tu

  • Resurrect ancestral EF-Tu proteins and compare their functional properties

  • Identify signatures of selection and correlate with functional domains

  • Compare EF-Tu function across the Shewanella species complex to identify adaptation patterns

• Evolutionary-Structural Integration:

  • Map evolutionary conservation onto 3D structures to identify functionally important regions

  • Analyze co-evolving residues to identify allosteric networks

  • Study the evolution of protein-protein interaction interfaces

  • Connect evolutionary divergence to structural adaptations in the context of different ecological niches

• Multi-Scale Integration Approach:

  • Molecular Scale: Atomic-level structural and dynamic properties

  • Cellular Scale: Translation efficiency and protein interaction networks

  • Organismal Scale: Growth and stress response phenotypes

  • Ecological Scale: Environmental adaptation and niche specialization

  • Evolutionary Scale: Speciation and selective pressures within the Shewanella genus

• Data Integration Platform:

  • Develop computational approaches to integrate diverse data types

  • Apply systems biology modeling to connect molecular properties to cellular phenotypes

  • Use machine learning approaches to identify patterns across multiple datasets

  • Create accessible databases and visualization tools for the research community