ATP5L2 Antibody

What are the primary applications for ATP5L2 antibodies in research?

ATP5L2 antibodies are validated for multiple experimental techniques including:

• Western blotting (WB): For quantifying ATP5L2 protein expression with typical dilutions of 1:500-1:1000

• Immunofluorescence (IF): For cellular localization studies with dilutions of 1:100-1:500

• Immunohistochemistry (IHC): For tissue expression analysis, particularly in paraffin-embedded samples

• Enzyme-linked immunosorbent assay (ELISA): For quantitative detection in solution with dilutions up to 1:40000

• Immunoprecipitation (IP): For protein-protein interaction studies

Mitochondrial localization studies specifically show ATP5L2 colocalizes with mitochondrial markers such as cytochrome C oxidase IV (COXIV), consistent with its role in mitochondrial ATP synthesis .

How is ATP5L2 antibody specificity validated?

Specificity validation typically involves multiple approaches:

• Western blot analysis showing a single band at the expected molecular weight (approximately 11 kDa for ATP5L2)

• Immunofluorescence with appropriate cellular localization (mitochondrial pattern)

• Immunoprecipitation followed by mass spectrometry confirmation

• Negative controls using PBS instead of primary antibody

• Knockdown or knockout validation using siRNA or CRISPR-Cas9 approaches

The predicted band size of 11 kDa appears in western blots from various tissue lysates including HeLa cells, human fetal liver, and human pancreas .

What is the difference between monoclonal and polyclonal ATP5L2 antibodies?

For critical quantitative applications, monoclonal antibodies often provide better reproducibility, while polyclonal antibodies may offer advantages in detection sensitivity, particularly in fixed tissues .

How should ATP5L2 antibodies be optimized for mitochondrial protein detection?

Optimizing ATP5L2 antibody protocols for mitochondrial protein detection requires:

• Sample preparation: For Western blot, cell fractionation to enrich mitochondrial proteins is recommended. Use 20 μg of protein lysate per lane for optimal detection .

• Fixation optimization: For immunofluorescence, 4% paraformaldehyde fixation with 0.1% Triton X-100 permeabilization has been validated . Overfixation can mask epitopes in mitochondrial proteins.

• Antibody dilution testing:

  • Western blot: 1:1000 dilution (with detection using HRP-conjugated secondary antibodies at 1:1000)

  • Immunofluorescence: 1:100 dilution (19 μg/mL) with fluorophore-conjugated secondary antibodies at 1:200-1:400

  • IHC-P: 1:100 dilution (19.4 μg/mL) with pre-diluted HRP Polymer for detection

• Antigen retrieval: For IHC applications, heat-mediated antigen retrieval with Tris/EDTA buffer (pH 9.0) is recommended prior to immunostaining .

• Controls: Include proper negative controls (secondary antibody only, or PBS instead of primary antibody) and positive controls (tissues known to express ATP5L2 such as kidney or liver) .

What are the best methods for studying ATP5L2 in the context of mitochondrial function?

Research on ATP5L2 and mitochondrial function can employ several approaches:

• Colocalization studies: Double immunofluorescence with established mitochondrial markers (e.g., COXIV) to confirm mitochondrial localization .

• ATP synthase activity assays: Measure Complex V activity when investigating ATP5L2 function using commercially available kits that assay ATP synthase activity. Controls should include oligomycin (10 μM) as a positive control for ATP synthase inhibition .

• Mitochondrial membrane potential (Δψm) assessment: Use ratiometric cationic dyes like JC-1 to investigate how ATP5L2 knockdown or overexpression affects mitochondrial membrane potential .

• Superoxide production measurement: Since ATP synthase activity is linked to ROS production, measure mitochondrial superoxide levels when manipulating ATP5L2 .

• ATP measurements: Quantify cellular ATP levels to determine functional consequences of ATP5L2 modulation .

• Blue Native PAGE: To assess assembly of mitochondrial respiratory chain complexes and supercomplexes containing ATP synthase components .

How can ATP5L2 antibodies be used in protein-protein interaction studies?

For studying ATP5L2 interactions with other proteins:

• Immunoprecipitation: ATP5L2 antibodies (at 1:100 dilution) can precipitate the protein from tissue lysates (e.g., human fetal liver) for subsequent western blot analysis or mass spectrometry identification of binding partners .

• Proximity ligation assays: To detect in situ interactions between ATP5L2 and other mitochondrial proteins with spatial resolution.

• Co-immunoprecipitation validation: After identifying potential interactors, reciprocal co-IP experiments should be performed to confirm interactions, similar to approaches used for other ATP synthase subunits like ATP5B .

• DARTS (Drug Affinity Responsive Target Stability): For investigating whether ATP5L2 is a target of small molecules affecting mitochondrial function, similar to approaches used for ATP5A .

• Pull-down assays: Using tagged versions of ATP5L2 to identify novel interacting partners in different cellular compartments or under various stress conditions.

How do ATP5L2 antibodies perform in studying disease mechanisms related to mitochondrial dysfunction?

ATP5L2 antibodies have applications in studying several disease contexts:

• Neurodegenerative diseases: ATP synthase has been implicated in both aging and age-associated dementia. ATP5L2 antibodies can assess changes in expression or localization in models of neurodegeneration .

• Cancer research: Elevated extracellular ATP is a feature of tumor microenvironments. ATP5L2 antibodies can be used to investigate ATP synthase components in cancer cells, particularly in relation to purinergic signaling .

• Dystonia: Variants in ATP synthase subunits (particularly ATP5F1B) have been linked to dominantly inherited dystonia. ATP5L2 antibodies can help characterize the effects of these variants on ATP synthase composition and function .

• Mitochondrial disorders: For analyzing changes in mitochondrial complexes and supercomplexes using techniques like BN-PAGE, where high molecular weight bands visualized with ATP synthase antibodies can reveal dimeric or oligomeric complex V, or complex V-containing super-complexes .

Research on the drug J147, which partially inhibits ATP synthase activity by binding to ATP5A, demonstrates how antibodies against ATP synthase components can reveal novel therapeutic mechanisms in neurodegeneration .

What approaches should be used when investigating post-translational modifications of ATP5L2?

Investigating post-translational modifications (PTMs) of ATP5L2 requires specialized approaches:

• Phosphorylation studies: Use phospho-specific antibodies or phospho-enrichment followed by mass spectrometry to identify potential phosphorylation sites.

• Acetylation analysis: ATP synthase components can undergo acetylation affecting activity. Use anti-acetyl-lysine antibodies in conjunction with ATP5L2 immunoprecipitation.

• Oxidative modifications: Given the proximity to ROS production sites, analyze oxidative modifications using redox proteomics approaches after immunoprecipitation with ATP5L2 antibodies.

• Ubiquitination: For studying degradation mechanisms, use ATP5L2 antibodies in conjunction with ubiquitin immunoprecipitation or directly detect ubiquitinated forms by western blot.

• Native gel electrophoresis: To maintain intact complexes and detect modifications that may alter complex assembly or stability .

Note that validation of any identified PTM requires careful controls including in vitro dephosphorylation, deacetylation, or similar treatments to confirm specificity of detection.

How can ATP5L2 antibodies be used in the context of studying mitochondrial biogenesis and dynamics?

For investigating mitochondrial biogenesis and dynamics involving ATP5L2:

• Quantitative changes during mitochondrial biogenesis: Monitor ATP5L2 expression relative to other mitochondrial proteins during biogenesis stimulated by AMPK activators or PGC-1α overexpression.

• Mitochondrial network analysis: Combine ATP5L2 immunofluorescence with mitochondrial network visualization (using MitoTracker dyes) to assess how modulation of ATP5L2 affects mitochondrial morphology .

• Mitophagy studies: Use ATP5L2 antibodies together with autophagy markers to investigate selective turnover of mitochondria containing ATP5L2.

• Super-resolution microscopy: For detailed localization studies of ATP5L2 within mitochondrial subcompartments.

• Organelle fractionation: Use subcellular fractionation followed by western blotting with ATP5L2 antibodies to track protein distribution during dynamic mitochondrial processes.

Research has shown that modulation of ATP synthase components affects mitochondrial membrane potential (Δψm), which in turn can influence mitochondrial dynamics and quality control processes .

What are common challenges when working with ATP5L2 antibodies and how can they be addressed?

Common challenges and solutions when working with ATP5L2 antibodies include:

• Low signal intensity in western blots:

  • Increase protein loading (up to 20-30 μg)

  • Reduce antibody dilution (try 1:500 instead of 1:1000)

  • Use enhanced chemiluminescence detection systems

  • Consider longer exposure times

  • Try membrane transfer optimization for small proteins (11 kDa)

• High background in immunofluorescence:

  • Increase blocking time/concentration

  • Use more stringent washing conditions

  • Reduce primary antibody concentration (try 1:200 instead of 1:100)

  • Include additional negative controls (using siRNA-treated samples)

• Specificity concerns:

  • Validate with multiple antibodies targeting different epitopes

  • Include knockout/knockdown controls

  • Confirm band size matches predicted molecular weight (11 kDa)

• Inconsistent results between techniques:

  • Consider epitope accessibility differences between applications

  • Optimize fixation conditions for each application separately

  • Use native versus denaturing conditions appropriately based on application

• Cross-reactivity concerns with ATP5L:

  • Some antibodies (e.g., ab191417) recognize both ATP5L2 and ATP5L

  • When specific detection is required, choose antibodies with validated specificity for ATP5L2 alone

How can researchers ensure reproducibility when using ATP5L2 antibodies across different experimental systems?

To ensure reproducibility across experimental systems:

• Detailed antibody reporting: Document complete antibody information:

  • Manufacturer and catalog number

  • Clone identifier for monoclonal antibodies

  • Lot number (especially important for polyclonal antibodies)

  • Host species and clonality

  • Immunogen sequence used to generate the antibody

• Protocol standardization:

  • Standardize sample preparation methods

  • Use consistent blocking reagents

  • Maintain consistent antibody dilutions and incubation times/temperatures

  • Document detailed protocols including buffer compositions

• Validation across systems:

  • Revalidate antibodies when changing cell types or tissues

  • Include positive control samples with known expression

  • Use orthogonal methods to confirm findings (e.g., gene expression data to support protein expression)

• Quantification standards:

  • Include internal loading controls appropriate for mitochondrial proteins

  • Use reference standards for quantitative comparisons

  • Apply consistent image acquisition settings and analysis methods

• Biological replicates:

  • Perform experiments with sufficient biological replicates (minimum n=3)

  • Consider both technical and biological variability in experimental design

What are the best practices for long-term storage and handling of ATP5L2 antibodies?

Proper storage and handling of ATP5L2 antibodies ensures maintained activity:

• Storage conditions:

  • Store at -20°C or -80°C as recommended by manufacturer

  • For conjugated antibodies, protect from light

  • Avoid repeated freeze-thaw cycles (prepare small aliquots)

  • Some antibodies (PBS Only formulations) may require -80°C storage

• Working solution preparation:

  • Thaw antibodies on ice

  • Dilute in recommended buffers containing stabilizing proteins

  • Prepare fresh working dilutions for each experiment when possible

  • Return stock solutions to storage promptly

• Stability considerations:

  • Document date of first use and track performance over time

  • Validate antibody performance periodically with positive controls

  • Consider using antibody stabilizers for diluted solutions

  • Follow manufacturer expiration guidelines

• Avoiding contamination:

  • Use aseptic technique when handling antibody stocks

  • Include sodium azide (0.02%) in working solutions unless contraindicated

  • Avoid introducing microorganisms that could degrade antibodies

• Transportation:

  • Transport on wet ice for short periods

  • Use dry ice for longer transportation times

  • Monitor temperature during shipping

How might ATP5L2 antibodies contribute to research on the tumor microenvironment?

ATP5L2 antibodies have significant potential in tumor microenvironment research:

• Exploiting elevated extracellular ATP: Research has shown that extracellular ATP concentration is highly elevated in tumor microenvironments while remaining tightly regulated in normal tissues. ATP5L2 antibodies can help investigate how ATP synthase components contribute to this phenomenon .

• Therapeutic targeting: Antibodies against ATP synthase components can be developed for therapeutic applications, potentially exploiting ATP-dependent binding to direct therapeutic antibodies specifically to tumor microenvironments .

• Investigating reversal of ATP synthase function: In certain tumor microenvironments, ATP synthase may operate in reverse. ATP5L2 antibodies can help characterize this phenomenon in different cancer types .

• Metabolic adaptation studies: ATP5L2 antibodies can reveal alterations in ATP synthase expression, localization, or assembly that contribute to metabolic adaptations in cancer cells .

• Ectopic ATP synthase localization: Some studies suggest ATP synthase components can be found on cancer cell surfaces. ATP5L2 antibodies can help investigate whether this subunit participates in these unusual localizations .

Research using phage display technology has established methods to identify antibodies that bind to antigens only in the presence of ATP, which could represent a novel approach for targeting the tumor microenvironment while avoiding on-target off-tumor toxicity .

What role might ATP5L2 play in aging and age-associated neurodegenerative diseases?

ATP5L2 antibodies can help investigate several aspects of aging and neurodegeneration:

• Altered expression in aging: ATP5L2 antibodies can assess whether expression levels change in aged tissues compared to young controls, particularly in metabolically active tissues like brain .

• Mitochondrial dysfunction in neurodegeneration: Research has linked aging and age-associated dementia through ATP synthase, suggesting this complex is a shared drug target. ATP5L2 antibodies can help characterize these connections in different neurodegenerative conditions .

• Drug target identification: ATP5L2 antibodies can be used in approaches like DARTS (Drug Affinity Responsive Target Stability) to identify whether this subunit is targeted by compounds that show promise in neurodegeneration models .

• Association with cellular stress responses: ATP5L2 antibodies can help investigate whether this subunit participates in stress-induced signaling pathways activated during aging and neurodegeneration .

• Altered post-translational modifications: Changes in PTMs of ATP synthase components may occur during aging. ATP5L2 antibodies, especially modification-specific antibodies, can help characterize these changes .

Research on compounds like J147, which targets ATP5A to partially inhibit ATP synthase activity, demonstrates the therapeutic potential of modulating ATP synthase function in neurodegenerative diseases, suggesting similar approaches might be relevant for other subunits like ATP5L2 .

How do ATP5L2 antibodies contribute to understanding novel protein-protein interactions in mitochondrial research?

ATP5L2 antibodies facilitate discovery and characterization of protein interactions:

• Complex assembly analysis: ATP5L2 antibodies can help characterize how this subunit participates in the assembly of ATP synthase complexes and supercomplexes, particularly through techniques like BN-PAGE .

• Interactome mapping: Mass spectrometry analysis following ATP5L2 immunoprecipitation can reveal novel interacting partners beyond the core ATP synthase components .

• Dynamic interaction studies: ATP5L2 antibodies can help investigate how interactions change under different metabolic conditions or in response to cellular stressors .

• Regulatory protein identification: Some proteins may interact transiently with ATP synthase components to regulate function. ATP5L2 antibodies can help identify such regulatory interactions .

• Structural studies: ATP5L2 antibodies can assist in generating samples for structural biology approaches like cryo-EM to understand how this subunit fits within the larger ATP synthase complex .

Research has demonstrated that ATP synthase components can interact with unexpected partners. For example, HIF-1α mRNA has been shown to bind to ATP5B in an ATP synthase enzyme activity-independent manner, suggesting complex regulatory mechanisms involving ATP synthase components that extend beyond their canonical roles in energy production .