rasl11b Antibody

What is RASL11B and why is it important in cellular signaling research?

RASL11B (RAS-like family 11 member B) is a Ras-related GTPase that plays significant roles in cellular signaling pathways. Unlike typical Ras family proteins, RASL11B lacks prenylation sites that are normally crucial for membrane localization and function. This results in its cytoplasmic localization, suggesting a unique mechanism of action in mediating responses to extracellular signals such as transforming growth factor beta 1 (TGFβ1) . RASL11B shows predominant expression in placenta and primary macrophages, indicating importance in developmental and immune processes . Its potential involvement in inflammation, arteriosclerosis, and cancer makes it a valuable target for researchers investigating these biological processes .

How do I select the appropriate RASL11B antibody for my research?

Selection should be based on several critical factors:

• Application compatibility: Different RASL11B antibodies are validated for specific applications. For example:

  • The C-3 mouse monoclonal antibody is validated for WB, IP, IF, IHCP, and ELISA

  • The PACO62199 rabbit polyclonal antibody is validated for ELISA, IHC, and IF

  • The 1B5 mouse monoclonal antibody is validated for Western Blot, ELISA, and Sandwich ELISA

• Species reactivity: Confirm the antibody detects RASL11B in your experimental species. Available antibodies detect:

  • Human, mouse, and rat (C-3 antibody)

  • Human only (PACO62199 and 1B5 antibodies)

• Clonality requirements: Consider whether monoclonal specificity or polyclonal broad epitope recognition better serves your experimental needs.

• Conjugation needs: RASL11B antibodies are available in both non-conjugated forms and conjugated variants including HRP, PE, FITC, and Alexa Fluor conjugates for specialized applications .

What experimental controls should I include when working with RASL11B antibodies?

To ensure reliable results:

• Positive control: Use tissues or cell lines with known RASL11B expression (placenta and primary macrophages show high expression)

• Negative control: Include samples from RASL11B knockout models or use siRNA knockdown samples

• Isotype control: For monoclonal antibodies like C-3 (IgG1 kappa light chain) or 1B5 (IgG1 κ) , include matching isotype controls

• Loading control: For quantitative Western blots, include housekeeping protein detection

• Secondary-only control: For immunostaining, include controls without primary antibody to assess background

What are the recommended protocols for Western blotting with RASL11B antibodies?

For optimal Western blot results with RASL11B antibodies:

• Sample preparation:

  • Use RIPA buffer with protease inhibitors

  • Denature samples at 95°C for 5 minutes in loading buffer containing SDS and DTT

• Gel electrophoresis and transfer:

  • Use 10-12% polyacrylamide gels (RASL11B is approximately 27-28 kDa)

  • Transfer to PVDF or nitrocellulose membranes

• Antibody incubation:

  • For C-3 antibody: Use at 200 μg/ml concentration

  • For 1B5 antibody: Use at 1:500 dilution

  • For ABIN3003912 antibody: Follow manufacturer recommendations

• Detection system:

  • Enhanced chemiluminescence (ECL) for non-conjugated antibodies

  • For direct detection, RASL11B-HRP conjugated antibodies are available

How should I optimize immunofluorescence protocols for RASL11B detection?

For successful immunofluorescence with RASL11B antibodies:

• Fixation and permeabilization:

  • 4% paraformaldehyde (15 minutes at room temperature) followed by 0.1% Triton X-100 (10 minutes)

  • Alternative: Methanol fixation (-20°C for 10 minutes)

• Blocking:

  • 10% normal serum (matching species of secondary antibody) for 30 minutes at room temperature

• Antibody dilutions:

  • For PACO62199: Use 1:50-1:200 dilution

  • For C-3: Follow manufacturer recommendations for IF applications

• Detection system:

  • Fluorophore-conjugated secondary antibodies

  • Directly conjugated antibodies (FITC, PE, or Alexa Fluor) are available for simpler protocols

• Expected pattern:

  • Primarily cytoplasmic localization due to RASL11B's lack of prenylation sites

What is the recommended protocol for immunohistochemistry of RASL11B in tissue sections?

For effective immunohistochemistry:

• Sample preparation:

  • Formalin-fixed paraffin-embedded (FFPE) tissue sections (4-6 μm thickness)

  • Deparaffinize and rehydrate through xylene and graded alcohol series

• Antigen retrieval:

  • High-pressure citrate buffer (pH 6.0) method is effective

• Blocking and antibody application:

  • Block with 10% normal goat serum for 30 minutes at room temperature

  • For PACO62199: Use 1:20-1:200 dilution

  • For C-3: Follow manufacturer recommendations for IHCP

• Detection and visualization:

  • HRP-conjugated secondary antibody with DAB substrate

  • Alternatively, use directly HRP-conjugated RASL11B antibody

• Counterstaining:

  • Hematoxylin for nuclear visualization

How can RASL11B antibodies be employed to study its role in developmental processes?

RASL11B has demonstrated significant roles in development, particularly in zebrafish models:

• Developmental phenotype analysis:

  • Antibodies can be used to track RASL11B expression during critical developmental stages

  • In zebrafish studies, Rasl11b knock-down suppressed One-Eyed-Pinhead (Oep) phenotypes

  • Rasl11b appears to function as a negative modulator of endoderm and prechordal plate formation

• Co-localization studies:

  • Use double immunofluorescence with developmental markers

  • Examine potential interactions with the Nodal signaling pathway components

• Expression pattern analysis:

  • Track RASL11B expression across developmental timepoints using quantitative Western blotting or immunohistochemistry

  • Compare with key developmental regulators

Research findings suggest that understanding RASL11B's developmental role requires attention to its interactions with other signaling pathways. Studies have shown that constitutively active Rasl11b (Rasl11b*) inhibits endoderm and prechordal plate formation, but only when Oep expression is decreased .

What approaches can be used to study RASL11B's role in cancer and disease?

RASL11B has potential implications in cancer and other diseases, and antibodies can facilitate:

• Expression profiling:

  • Compare RASL11B levels between normal and diseased tissues using Western blot or IHC

  • Quantitate differences using image analysis of immunostained sections

• Mechanistic studies:

  • Investigate RASL11B's role in oncogenic processes through co-immunoprecipitation with binding partners

  • Study how RASL11B modulates transforming growth factor beta 1 (TGFβ1) signaling

• Functional assays:

  • Examine effects of RASL11B knockdown or overexpression on cancer cell phenotypes

  • Track subcellular localization changes in disease states

Other members of the Rasl11b subgroup have demonstrated connections to cancer: Rasl11a mRNA is less abundant in some prostate cancers, and Rerg expression inhibits tumor formation and is decreased in primary human breast tumors . This suggests RASL11B may have similar implications worthy of investigation.

How can I distinguish between active and inactive forms of RASL11B in my samples?

As a small GTPase, RASL11B cycles between active (GTP-bound) and inactive (GDP-bound) states:

How can I resolve issues with background or non-specific binding in RASL11B immunodetection?

When encountering high background:

• Antibody optimization:

  • Titrate antibody concentration (start with manufacturer recommendations and adjust as needed)

  • For PACO62199 antibody, recommended dilutions are:

    • ELISA: 1:2000-1:10000

    • IHC: 1:20-1:200

    • IF: 1:50-1:200

• Blocking optimization:

  • Increase blocking time or concentration

  • Try alternative blocking agents (BSA, normal serum, commercial blockers)

  • For IHC protocols, 10% normal goat serum has been effective

• Washing considerations:

  • Increase number or duration of wash steps

  • Use gentle agitation during washes

• Secondary antibody controls:

  • Always include a secondary-only control to identify non-specific binding

How do I validate RASL11B antibody specificity in my experimental system?

Comprehensive validation strategies include:

• Multiple antibody approach:

  • Compare results using different antibodies against RASL11B (e.g., C-3, PACO62199, and 1B5)

  • Antibodies targeting different epitopes should show similar patterns

• Genetic validation:

  • Use RASL11B knockdown/knockout models as negative controls

  • Transfect cells with RASL11B expression constructs as positive controls

• Peptide competition:

  • Pre-incubate antibody with excess immunizing peptide

  • Specific signals should be blocked by this treatment

• Molecular weight verification:

  • RASL11B has a molecular weight of approximately 27-28 kDa

  • The full-length protein sequence consists of 248 amino acids

• Mass spectrometry validation:

  • Perform immunoprecipitation followed by mass spectrometry to confirm the identity of the detected protein

What considerations are important when comparing results across different species?

When working with RASL11B across species:

• Sequence homology assessment:

  • Human and zebrafish Rasl11b maintain core functional domains but have some sequence differences

  • Zebrafish studies provide insight into developmental roles, but findings need verification in mammalian systems

• Antibody cross-reactivity:

  • C-3 antibody detects RASL11B in mouse, rat, and human samples

  • PACO62199 and 1B5 antibodies are validated for human samples only

  • Always validate antibodies for your species of interest

• Expression pattern differences:

  • In zebrafish, Rasl11b plays roles in endoderm and prechordal plate formation

  • In humans, RASL11B shows predominant expression in placenta and primary macrophages

  • These differences may reflect evolutionary divergence in function

• Functional conservation testing:

  • Use cross-species rescue experiments to determine functional conservation

  • Compare phenotypes of knockdown/knockout models across species