PEX11-2 Antibody

What is PEX11-2 and why is it significant in peroxisome research?

PEX11-2 belongs to the PEROXIN11 (PEX11) protein family, which plays crucial roles in peroxisome proliferation and division. PEX11 proteins are unique in their ability to promote peroxisome division across multiple species, making them essential targets for studying peroxisome biogenesis and function . Unlike earlier perspectives suggesting PEX11 proteins only indirectly affect peroxisome abundance through metabolic roles, current evidence indicates PEX11 proteins directly participate in peroxisome division mechanisms . PEX11-2 antibodies provide researchers with tools to detect, quantify, and localize these proteins, enabling investigations into peroxisome dynamics and associated metabolic pathways.

How do PEX11-2 antibodies differ from other PEX11 family antibodies?

PEX11-2 antibodies are specifically designed to target the PEX11-2 isoform with high specificity, unlike antibodies for other family members such as PEX11A, PEX11β, or PEX11G. While all target members of the same protein family, each antibody recognizes unique epitopes specific to its target isoform . When selecting between different PEX11 family antibodies, researchers should consider the expression patterns of each isoform in their experimental model. For instance, PEX11A shows high expression in kidney and liver tissues, whereas PEX11G demonstrates notable expression in testis tissue . Cross-reactivity between species should also be considered when planning experiments, as many PEX11 antibodies show reactivity with both human and mouse samples.

What are the typical molecular characteristics of PEX11-2 detected by antibodies?

PEX11-2 antibodies typically detect a protein with a molecular weight around 27-28 kDa, similar to other PEX11 family members. Based on comparative data from related PEX11 proteins, the calculated molecular weight corresponds to approximately 240-250 amino acids . PEX11-2, like other PEX11 proteins, is an integral membrane protein of peroxisomes, with specific membrane topology that influences epitope accessibility in different experimental conditions. When using PEX11-2 antibodies, researchers should account for potential post-translational modifications that might affect apparent molecular weight in techniques like Western blotting.

What are the optimal protocols for using PEX11-2 antibodies in Western blot applications?

For Western blot applications using PEX11-2 antibodies, researchers should follow these methodological steps:

• Sample preparation: Extract proteins from tissues or cells using a buffer containing detergents suitable for membrane proteins (e.g., RIPA buffer with 1% Triton X-100).

• Protein separation: Use 10-12% SDS-PAGE gels for optimal resolution of the ~27-28 kDa PEX11-2 protein.

• Transfer conditions: Transfer to PVDF membranes at 100V for 60-90 minutes in standard transfer buffer.

• Blocking: Block membranes with 5% non-fat dry milk in TBST for 1 hour at room temperature.

• Primary antibody incubation: Based on dilution ranges used for similar PEX11 antibodies, use PEX11-2 antibody at 1:1000-1:3000 dilution and incubate overnight at 4°C .

• Secondary antibody: Apply appropriate HRP-conjugated secondary antibody (typically anti-rabbit IgG for polyclonal antibodies) at 1:5000-1:10000 dilution.

• Detection: Use enhanced chemiluminescence (ECL) reagents and optimize exposure times for the specific signal intensity.

Researchers should validate antibody specificity using positive controls like tissues known to express PEX11-2 and negative controls such as tissues from knockout models or cells with siRNA-mediated knockdown.

How can PEX11-2 antibodies be effectively used in immunohistochemistry and immunofluorescence?

For immunohistochemistry (IHC) and immunofluorescence (IF) applications with PEX11-2 antibodies:

Immunohistochemistry protocol:

• Tissue preparation: Fix tissues in 10% neutral buffered formalin and embed in paraffin.

• Sectioning: Prepare 4-5 μm sections on charged slides.

• Antigen retrieval: Based on protocols for similar PEX11 antibodies, perform heat-induced epitope retrieval using TE buffer (pH 9.0) or citrate buffer (pH 6.0) .

• Blocking: Block endogenous peroxidase with 3% H₂O₂ and non-specific binding with 5% normal serum.

• Primary antibody: Apply PEX11-2 antibody at 1:20-1:200 dilution and incubate overnight at 4°C .

• Detection system: Use appropriate detection system (e.g., HRP-polymer and DAB chromogen).

• Counterstaining: Counterstain with hematoxylin and mount.

Immunofluorescence protocol:

• Cell preparation: Fix cells with 4% paraformaldehyde for 15 minutes.

• Permeabilization: Permeabilize with 0.2% Triton X-100 in PBS for 10 minutes.

• Blocking: Block with 3% BSA in PBS for 30 minutes.

• Primary antibody: Incubate with PEX11-2 antibody (1:50-1:200 dilution) overnight at 4°C.

• Secondary antibody: Apply fluorophore-conjugated secondary antibody (1:500 dilution) for 1 hour at room temperature.

• Counterstaining: Counterstain nuclei with DAPI and mount with anti-fade medium.

For peroxisome colocalization studies, combine with established peroxisomal markers such as YFP-PTS1 or antibodies against catalase .

What quality control measures should be implemented when using PEX11-2 antibodies?

To ensure reliable results with PEX11-2 antibodies, implement these quality control measures:

• Antibody validation:

  • Western blot: Confirm single band at expected molecular weight (~27-28 kDa)

  • Peptide competition assay: Pre-incubate antibody with immunizing peptide to confirm specificity

  • Knockout/knockdown controls: Use samples from PEX11-2 knockout models or siRNA-treated cells

• Storage and handling:

  • Store antibody at -20°C in small aliquots to avoid freeze-thaw cycles

  • Use appropriate buffer (PBS with 0.02% sodium azide and 50% glycerol, pH 7.3)

  • Ensure stability by following manufacturer's storage recommendations

• Experimental controls:

  • Positive tissue controls: Include tissues known to express PEX11-2 (based on PEX11 family expression patterns, kidney, liver, and testis tissues are recommended)

  • Technical controls: Include no-primary antibody controls to assess background signal

  • Loading controls: Use appropriate housekeeping proteins or total protein staining for quantitative Western blot

• Dilution optimization:

  • Perform titration experiments to determine optimal antibody concentration for each application and sample type

  • Test multiple dilutions (e.g., 1:500, 1:1000, 1:2000, 1:4000) to identify the concentration that maximizes signal-to-noise ratio

How can PEX11-2 antibodies be used to investigate peroxisome proliferation mechanisms?

PEX11-2 antibodies can be instrumental in elucidating peroxisome proliferation mechanisms through several advanced approaches:

• Quantitative peroxisome abundance analysis:

  • Use PEX11-2 antibodies in combination with peroxisomal matrix protein markers to quantify peroxisome number, size, and morphology

  • Apply high-content imaging analysis to measure changes in peroxisome parameters under different experimental conditions

  • Correlate PEX11-2 expression levels with peroxisome proliferation rates using immunofluorescence and digital image analysis

• Inducible expression systems:

  • Establish cells with doxycycline-inducible PEX11-2 expression

  • Use PEX11-2 antibodies to confirm protein expression and monitor peroxisome morphological changes over time

  • Quantify elongation, constriction, and fission events during peroxisome division

• Structure-function studies:

  • Generate cells expressing mutant PEX11-2 variants

  • Use PEX11-2 antibodies to validate expression and determine subcellular localization

  • Correlate specific domains or residues with peroxisome proliferation activity

  • Compare findings with known data from other PEX11 family members, such as the demonstrated ability of PEX11c and PEX11e to complement yeast pex11 mutants

• Interaction studies:

  • Use PEX11-2 antibodies for co-immunoprecipitation to identify protein-protein interactions

  • Combine with mass spectrometry to identify novel binding partners involved in peroxisome division

  • Validate interactions using reciprocal co-immunoprecipitation and proximity ligation assays

What are the methodological approaches for studying PEX11-2 involvement in metabolic diseases?

To investigate PEX11-2's role in metabolic diseases, researchers can employ these methodological approaches:

• Clinical sample analysis:

  • Use PEX11-2 antibodies to compare expression levels in tissue samples from patients with peroxisomal disorders versus healthy controls

  • Perform quantitative immunohistochemistry to assess correlation between PEX11-2 expression and disease severity

  • Examine potential alterations in PEX11-2 post-translational modifications in disease states

• Metabolic pathway analysis:

  • Use PEX11-2 antibodies to monitor protein expression in models of metabolic stress

  • Correlate PEX11-2 levels with markers of peroxisomal function, including:

    • Very long chain fatty acid (VLCFA) oxidation

    • Ether lipid synthesis

    • Bile acid synthesis

    • Reactive oxygen species metabolism

  • Based on findings with PEX11β-deficient mice, investigate if PEX11-2 deficiency similarly affects multiple peroxisomal metabolic pathways

• In vivo disease models:

  • Generate or analyze existing PEX11-2 knockout/knockdown animal models

  • Use PEX11-2 antibodies to confirm protein depletion and examine compensatory changes in other PEX11 family members

  • Correlate metabolic phenotypes with peroxisome abundance and morphology

  • Investigate whether PEX11-2 deficiency leads to steatosis and reduced fatty acid oxidation capacity, as observed with PEX11A deficiency

• Therapeutic intervention studies:

  • Test compounds that modulate peroxisome proliferation

  • Use PEX11-2 antibodies to monitor changes in protein expression and peroxisome abundance

  • Evaluate the efficacy of gene therapy approaches by assessing restoration of PEX11-2 expression and function

How can advanced imaging techniques be combined with PEX11-2 antibodies to study peroxisome dynamics?

Advanced imaging approaches combining PEX11-2 antibodies with cutting-edge techniques include:

• Super-resolution microscopy:

  • Use PEX11-2 antibodies with techniques like STORM, PALM, or STED microscopy

  • Achieve nanoscale resolution of peroxisome membrane structures

  • Visualize PEX11-2 distribution and clustering within the peroxisomal membrane

  • Combine with other peroxisomal markers to create detailed molecular maps of peroxisome division sites

• Live-cell imaging with correlative light and electron microscopy (CLEM):

  • Use fluorescently-tagged PEX11-2 antibody fragments for live-cell imaging

  • Track peroxisome dynamics in real-time

  • Fix cells at specific time points and process for electron microscopy

  • Correlate fluorescence signals with ultrastructural features to understand membrane remodeling during division

• FRET/FLIM analysis:

  • Employ fluorescently-labeled PEX11-2 antibodies with antibodies against potential interaction partners

  • Measure Förster Resonance Energy Transfer (FRET) to detect protein-protein interactions in situ

  • Use Fluorescence Lifetime Imaging Microscopy (FLIM) to quantify interaction strength

  • Map interaction dynamics during different stages of peroxisome proliferation

• Expansion microscopy:

  • Apply PEX11-2 antibodies to physically expanded cellular samples

  • Achieve improved resolution of peroxisome structures on standard confocal microscopes

  • Visualize membrane subdomains and protein distribution patterns

  • Based on findings with fluorescent protein fusions of PEX11 family members, examine whether PEX11-2 localizes to specific subdomains of peroxisomal membranes

What are common challenges in PEX11-2 antibody applications and how can they be addressed?

Researchers frequently encounter these challenges when working with PEX11-2 antibodies:

When optimizing PEX11-2 antibody experiments, researchers should systematically vary one parameter at a time while keeping others constant, thoroughly document all conditions, and include appropriate controls with each experiment.

How should researchers design experiments to distinguish between PEX11-2 and other PEX11 family members?

To accurately distinguish PEX11-2 from other PEX11 family members:

• Antibody selection strategies:

  • Choose antibodies raised against non-conserved regions of PEX11 proteins

  • Verify epitope specificity through sequence analysis

  • Consider using monoclonal antibodies targeting unique epitopes

  • Validate specificity using overexpression and knockout controls

• Experimental design approaches:

  • Perform parallel detection with isoform-specific antibodies

  • Include positive controls with known expression patterns

  • Complement protein detection with mRNA analysis (RT-qPCR or RNA-seq)

  • When interpreting results, account for tissue-specific expression patterns of different PEX11 isoforms

• Advanced discrimination techniques:

  • Use sequential immunoprecipitation to deplete specific isoforms

  • Employ isoform-specific siRNA knockdown to confirm antibody specificity

  • Consider two-dimensional electrophoresis to separate isoforms based on both molecular weight and isoelectric point

  • For closely related isoforms, use mass spectrometry to identify isoform-specific peptides

• Data analysis considerations:

  • Establish clear criteria for distinguishing signals

  • Quantify relative expression using calibrated standards

  • Account for potential co-expression of multiple isoforms

  • Based on findings with other PEX11 family members, consider functional complementation assays to distinguish biological activities

What considerations are important when studying species-specific differences in PEX11-2 function using antibodies?

When investigating species-specific differences in PEX11-2 function:

• Cross-reactivity evaluation:

  • Test antibody reactivity across species using Western blot

  • Confirm epitope conservation through sequence alignment

  • Validate detection in tissues from different species using appropriate positive and negative controls

  • Based on data from PEX11A and PEX11G antibodies, many PEX11 antibodies show reactivity with both human and mouse samples

• Experimental design considerations:

  • Include species-matched positive controls

  • Optimize protocols separately for each species

  • When comparing across species, standardize sample preparation and detection methods

  • Account for potential differences in PEX11-2 expression levels and patterns between species

• Functional analysis strategies:

  • Compare subcellular localization patterns across species

  • Assess conservation of protein-protein interactions

  • Evaluate differences in post-translational modifications

  • Determine if PEX11-2 can functionally complement deficiencies across species, similar to tests demonstrating that some plant PEX11 isoforms can complement yeast pex11 mutants

• Data interpretation frameworks:

  • Distinguish between species-specific differences in protein function versus expression

  • Consider evolutionary relationships when interpreting functional differences

  • Correlate protein differences with known species-specific variations in peroxisome biology

  • Develop comparative models to understand evolutionary conservation and divergence of PEX11-2 function

How can PEX11-2 antibodies contribute to understanding the integration of peroxisomes with other cellular organelles?

PEX11-2 antibodies can advance research on peroxisome-organelle interactions through:

• Multi-color co-localization studies:

  • Combine PEX11-2 antibodies with markers for other organelles (mitochondria, ER, lipid droplets)

  • Quantify proximity and contact sites using high-resolution microscopy

  • Track dynamic interactions through live-cell imaging of fluorescently-tagged proteins

  • Examine whether PEX11-2 localizes to specific membrane subdomains involved in inter-organelle contacts

• Proximity labeling approaches:

  • Generate PEX11-2 fusion constructs with proximity labeling enzymes (BioID, APEX)

  • Identify proteins in proximity to PEX11-2 at organelle contact sites

  • Use PEX11-2 antibodies to validate proximity labeling efficiency

  • Map the spatial organization of peroxisome-organelle interface proteomes

• Membrane fractionation techniques:

  • Use PEX11-2 antibodies to identify peroxisome-enriched membrane fractions

  • Isolate contact site membranes using density gradient centrifugation

  • Analyze protein and lipid compositions of isolated fractions

  • Investigate dynamic changes in membrane contacts under different metabolic conditions

• Functional studies:

  • Manipulate PEX11-2 expression and monitor effects on other organelles

  • Investigate whether PEX11-2, like other PEX11 family members, affects metabolic pathways beyond peroxisomes

  • Use antibodies to track redistribution of PEX11-2 during organelle remodeling

  • Assess involvement in coordinated responses to cellular stresses

What methodological approaches can combine PEX11-2 antibodies with systems biology techniques?

Integrative approaches combining PEX11-2 antibodies with systems biology include:

• Proteomics integration:

  • Use PEX11-2 antibodies for immunoprecipitation followed by mass spectrometry

  • Identify interactome changes under different physiological conditions

  • Construct protein-protein interaction networks centered on PEX11-2

  • Validate key interactions with orthogonal methods (co-immunoprecipitation, FRET)

• Multi-omics data correlation:

  • Correlate PEX11-2 protein levels with transcriptomics and metabolomics data

  • Identify metabolic pathways influenced by PEX11-2 expression

  • Use antibodies to validate protein-level changes predicted by computational models

  • Develop predictive models of peroxisome dynamics based on integrated datasets

• Network analysis approaches:

  • Place PEX11-2 in the context of peroxisome biogenesis pathways

  • Identify regulatory hubs controlling PEX11-2 expression

  • Use antibodies to validate predicted regulatory relationships

  • Apply mathematical modeling to predict effects of PEX11-2 perturbation on peroxisome homeostasis

• Spatial systems biology:

  • Use PEX11-2 antibodies for spatial proteomics approaches

  • Map subcellular distribution patterns under different conditions

  • Integrate spatial data with temporal dynamics from live-cell imaging

  • Develop spatiotemporal models of peroxisome division incorporating PEX11-2 function

How can PEX11-2 antibodies be used in developing therapeutic approaches for peroxisomal disorders?

PEX11-2 antibodies can contribute to therapeutic development through:

• Diagnostic applications:

  • Develop immunoassays to detect PEX11-2 in patient samples

  • Correlate PEX11-2 expression with disease severity

  • Use antibodies to screen for peroxisome deficiencies in patient-derived cells

  • Establish PEX11-2 as a potential biomarker for specific peroxisomal disorders

• Drug discovery support:

  • Screen compounds that modulate PEX11-2 expression or function

  • Use antibodies to monitor drug effects on peroxisome abundance and morphology

  • Develop high-throughput screening assays based on PEX11-2 immunodetection

  • Validate therapeutic candidates in disease models

• Gene therapy validation:

  • Monitor restoration of PEX11-2 expression after gene therapy approaches

  • Assess peroxisome recovery in treated cells using antibody-based detection

  • Quantify therapeutic efficacy through peroxisome proliferation measurements

  • Track long-term stability of restored PEX11-2 expression

• Personalized medicine applications:

  • Analyze PEX11-2 variants in patient samples using isoform-specific antibodies

  • Correlate specific mutations with altered peroxisome dynamics

  • Develop targeted interventions based on patient-specific PEX11-2 defects

  • Based on findings with PEX11β deficiency, explore therapeutic strategies for patients with PEX11-2 mutations affecting peroxisome division