RPS29B Antibody

What is RPS29 and what cellular functions does it perform?

Ribosomal Protein S29 (RPS29) is a small but essential component of the 40S ribosomal subunit with a calculated molecular weight of 56 amino acids (7 kDa) and an observed molecular weight of 7 kDa when analyzed by SDS-PAGE . The protein is encoded by the RPS29 gene, which has the NCBI Gene ID 6235 and is referenced in multiple databases including UniProt (P62273), OMIM (603633), and HGNC (10419) .

RPS29 plays a crucial role in ribosome biogenesis and protein synthesis. Beyond its structural role in ribosomes, recent research has revealed additional functions, including its involvement in protein degradation pathways. Specifically, RPS29 has been shown to increase CYP6N3 protein degradation through the proteasome pathway, suggesting a regulatory role in protein turnover . Additionally, variants in RPS29 can affect ribosome biogenesis and impact translational fidelity, demonstrating its importance in maintaining proper cellular function .

What applications is RPS29 antibody validated for?

RPS29 antibody has been validated for multiple experimental applications, with consistent performance across different techniques. The primary validated applications include:

• Western Blot (WB): Consistently detected in human cell lines including HeLa and HepG2 cells with recommended dilutions ranging from 1:1000 to 1:6000 or 1:500 to 1:2000 depending on the specific antibody preparation .

• Immunohistochemistry (IHC): Successfully detects RPS29 in tissue samples, particularly in mouse brain tissue, with recommended dilutions of 1:50 to 1:500 . For optimal results, antigen retrieval should be performed with TE buffer at pH 9.0, though citrate buffer at pH 6.0 can serve as an alternative .

• Enzyme-Linked Immunosorbent Assay (ELISA): Validated for detecting RPS29 in solution-based immunoassays .

It's important to note that antibody performance can vary between experimental systems, and titration of the antibody in each specific testing system is recommended to obtain optimal results .

What are the key species reactivity and specificity characteristics?

RPS29 antibody (17374-1-AP) shows confirmed reactivity with human and mouse samples . This cross-species reactivity makes it valuable for comparative studies between these mammalian models. The antibody is derived from rabbit hosts and is of the IgG isotype, produced as a polyclonal antibody .

The specificity of the antibody is ensured through its production method, which utilizes an RPS29 fusion protein (Ag11179) as the immunogen . Further purification is achieved through antigen affinity chromatography, resulting in a highly specific antibody preparation with ≥95% purity as determined by SDS-PAGE .

For researchers working with other species, it's advisable to perform validation experiments before proceeding with full-scale studies, as cross-reactivity with other species beyond human and mouse has not been comprehensively documented in the provided search results.

How does RPS29 contribute to metabolic insecticide resistance mechanisms?

Research has revealed a fascinating role for RPS29 in metabolic insecticide resistance mechanisms, particularly in relation to deltamethrin (DM) resistance. Through tandem affinity purification (TAP) techniques, RPS29 was found to interact with CYP6N3, a member of the cytochrome P450 superfamily known to be involved in detoxification processes .

The interaction between RPS29 and CYP6N3 has functional consequences for insecticide resistance. Experiments using cell viability assays (CCK-8) showed that cells transfected with pIB-RPS29 were more susceptible to DM exposure, while RPS29 knockdown significantly enhanced cell viability under DM exposure conditions. Conversely, CYP6N3 overexpression significantly enhanced cell viability in the presence of DM, but this protective effect was reversed by RPS29 overexpression .

The molecular mechanism underlying this interaction involves protein degradation pathways. RPS29 increases CYP6N3 protein degradation through the proteasome, effectively reducing the levels of this detoxification enzyme and thereby decreasing resistance to insecticides . This research highlights a potential regulatory mechanism where ribosomal proteins can influence metabolic resistance pathways beyond their canonical roles in protein synthesis.

What experimental approaches can detect RPS29-protein interactions?

Several robust experimental approaches have been employed to detect and characterize RPS29 interactions with other proteins:

• Tandem Affinity Purification (TAP): This technique allows for the rapid purification of protein complexes under native conditions, even when expressed at their natural levels. N-terminally TAP-tagged RPS29 was stably expressed in C6/36 cells and used to identify interacting proteins. The TAP tag consists of two IgG binding domains (streptavidin and a calmodulin binding peptide) separated by a TEV protease cleavage site .

• GST Pull-Down Assays: To confirm interactions identified by TAP, GST pull-down assays were used. RPS29 was cloned into the pGEX-6p-1 expression vector downstream of the GST sequence, while potential interacting proteins like CYP6N3 were cloned into the PET-32a expression vector downstream of the His sequence .

• Immunofluorescence: This technique was employed to visualize the co-localization of RPS29 with interacting proteins in cells. For RPS29 visualization, fusion constructs with fluorescent proteins (GFP-RPS29) were created using the pIB-V5-His vector system .

• Co-immunoprecipitation: Though not explicitly detailed in the search results, this is another common technique that could be applied to study RPS29 interactions using the available antibodies.

These methodologies can be adapted by researchers investigating novel RPS29 interactions in different biological contexts.

How do RPS29 variants impact ribosome biogenesis and function?

Research on ribosomal protein variants, including those in RPS29, has revealed that different variants in the same ribosomal protein gene can have remarkably different downstream effects, despite driving similar ribosome biogenesis defects .

Studies have shown that variants in RPS29 can affect:

These findings underscore the complex relationship between ribosomal protein variants and cellular physiology, extending beyond simple effects on protein synthesis.

What are the optimal protocols for Western blot detection of RPS29?

For optimal Western blot detection of RPS29, researchers should follow these detailed methodological considerations:

Recommended Protocol:

• Sample Preparation:

  • Extract total protein from cells (HeLa and HepG2 cells have been validated) or tissues using appropriate lysis buffers

  • Quantify protein concentration using standard methods (Bradford or BCA assay)

• Gel Electrophoresis:

  • Load 20-30 μg of protein per lane

  • Use high percentage (12-15%) SDS-PAGE gels to resolve the low molecular weight RPS29 protein (7 kDa)

• Transfer:

  • Use PVDF membranes (0.2 μm pore size recommended for small proteins)

  • Consider semi-dry transfer methods with methanol-containing transfer buffer for efficient transfer of small proteins

• Antibody Incubation:

  • Block membrane with 5% non-fat milk or BSA in TBST

  • Dilute RPS29 antibody 1:1000-1:6000 (for 17374-1-AP) or 1:500-1:2000 (for other preparations)

  • Incubate with primary antibody overnight at 4°C

  • Wash thoroughly with TBST (3-5 times, 5-10 minutes each)

  • Incubate with appropriate HRP-conjugated secondary anti-rabbit antibody

• Detection:

  • Use enhanced chemiluminescence (ECL) detection system

  • Expected band size: 7 kDa

It's important to note that the observed molecular weight of RPS29 is 7 kDa, which matches the calculated molecular weight . This consistency makes the protein identification more straightforward, but proper controls should still be included.

What are the recommended protocols for immunohistochemical detection of RPS29?

For optimal immunohistochemical detection of RPS29 in tissue samples, researchers should follow these methodological guidelines:

Recommended IHC Protocol:

• Tissue Preparation:

  • Fix tissues in 10% neutral buffered formalin

  • Embed in paraffin and section at 4-6 μm thickness

  • Mount sections on positively charged slides

• Antigen Retrieval (Critical Step):

  • Primary Recommendation: Use TE buffer at pH 9.0

  • Alternative Method: Use citrate buffer at pH 6.0

  • Heat-induced epitope retrieval (HIER) should be performed (e.g., using a pressure cooker or microwave)

• Blocking and Antibody Incubation:

  • Block endogenous peroxidase activity with 3% H₂O₂

  • Block non-specific binding with serum or protein block

  • Dilute RPS29 antibody at 1:50-1:500

  • Incubate sections with primary antibody at 4°C overnight or at room temperature for 1-2 hours

• Detection System:

  • Use appropriate detection system (e.g., HRP-polymer or ABC method)

  • Develop with DAB or other chromogen

  • Counterstain with hematoxylin

  • Dehydrate, clear, and mount with permanent mounting medium

• Controls:

  • Include positive control tissues (mouse brain tissue has been validated)

  • Include negative controls (omission of primary antibody)

The IHC protocol should be optimized for each laboratory's specific conditions and equipment. Mouse brain tissue has been specifically validated as positive control material for RPS29 immunohistochemistry .

How should RPS29 antibody be stored to maintain optimal activity?

Proper storage of RPS29 antibody is critical for maintaining its activity and specificity over time. Based on the provided search results, the following storage conditions are recommended:

• Temperature: Store at -20°C for long-term preservation .

• Buffer Composition: The antibody is supplied in PBS with 0.02% sodium azide and 50% glycerol at pH 7.3 . This formulation helps maintain antibody stability during freeze-thaw cycles.

• Aliquoting: While specifically noted as "unnecessary for -20°C storage" for 17374-1-AP preparation , it is generally good practice to aliquot antibodies to minimize freeze-thaw cycles, particularly for applications requiring high sensitivity.

• Stability: The antibody is stable for one year after shipment when stored properly . Some preparations specify a validity period of 12 months .

• Special Considerations: Some preparations (20 μl sizes) contain 0.1% BSA, which may need to be considered when designing certain experiments .

• Handling After Thawing: Once thawed, keep the antibody on ice while in use and return to -20°C as soon as possible after use.

Following these storage recommendations will help ensure consistent and reliable results when using RPS29 antibody in various experimental applications.

How can non-specific binding be reduced in RPS29 antibody applications?

Non-specific binding can significantly impact the quality and reliability of experimental results. To reduce non-specific binding when using RPS29 antibody, researchers should consider the following approaches:

• Optimize Blocking Conditions:

  • Test different blocking agents (BSA, non-fat milk, normal serum, commercial blocking buffers)

  • Increase blocking time or concentration if background is high

  • Consider adding 0.1-0.3% Triton X-100 or Tween-20 to reduce hydrophobic interactions

• Antibody Dilution Optimization:

  • Titrate antibody concentrations to find the optimal signal-to-noise ratio

  • For Western blot, dilutions between 1:1000-1:6000 are recommended

  • For IHC, dilutions between 1:50-1:500 should be tested

  • Always follow the principle that "this reagent should be titrated in each testing system to obtain optimal results"

• Washing Protocols:

  • Increase the number and duration of washing steps

  • Use appropriate detergent concentration in wash buffers

  • Ensure complete buffer removal between washing steps

• Pre-absorption:

  • For polyclonal antibodies like the RPS29 antibody, pre-absorption with the immunizing peptide or recombinant RPS29 protein can reduce non-specific binding

• Sample-Specific Considerations:

  • For IHC applications, optimize antigen retrieval conditions (TE buffer pH 9.0 is recommended for RPS29 antibody, with citrate buffer pH 6.0 as an alternative)

  • For tissues with high endogenous peroxidase activity, ensure complete quenching

By systematically addressing these factors, researchers can minimize non-specific binding and improve the quality of their experimental results with RPS29 antibody.

What controls should be included when using RPS29 antibody in experiments?

Proper experimental controls are essential for interpreting results with RPS29 antibody. The following controls should be considered:

• Positive Controls:

  • Cell lines: HeLa and HepG2 cells have been validated for Western blot applications

  • Tissues: Mouse brain tissue has been validated for IHC applications

  • Include samples known to express RPS29 at detectable levels

• Negative Controls:

  • Primary antibody omission: Replace primary antibody with antibody diluent

  • Isotype control: Use non-specific rabbit IgG at the same concentration

  • RPS29 knockdown or knockout samples (when available) serve as specificity controls

• Loading Controls for Western Blot:

  • Use housekeeping proteins (e.g., actin, GAPDH) to normalize protein loading

  • In the cited study, actin was used as a loading control when examining RPS29-related protein expression

• Validation Controls:

  • If studying RPS29 interactions, include appropriate controls for protein-protein interaction assays

  • For TAP experiments, include control purifications with untagged proteins

  • For GST pull-down assays, include GST-only controls

• Experimental Validation:

  • Confirm results with alternative methods or alternative antibodies when possible

  • Consider using recombinant RPS29 protein as a reference standard

• Technical Replicates:

  • Perform experiments in triplicate to ensure reproducibility, as was done for RT-PCR experiments in the referenced study

Including these controls will enhance the validity and reliability of experiments using RPS29 antibody and facilitate accurate interpretation of results.

How can RPS29 antibody be used to study protein-protein interactions in complex cellular contexts?

RPS29 antibody can be leveraged in multiple sophisticated approaches to study protein-protein interactions in complex cellular contexts:

• Co-Immunoprecipitation (Co-IP):

  • Use RPS29 antibody coupled to protein A/G beads to pull down RPS29 and its interacting partners

  • Analyze precipitated complexes by mass spectrometry or Western blot

  • This approach can identify both direct and indirect interactions within native protein complexes

• Proximity Ligation Assay (PLA):

  • Combine RPS29 antibody with antibodies against suspected interaction partners

  • This technique can visualize protein interactions in situ with single-molecule resolution

  • Particularly useful for detecting transient or weak interactions in their cellular context

• Immunofluorescence Co-localization:

  • Combine RPS29 antibody with antibodies against potential interacting proteins

  • Analyze co-localization using confocal microscopy

  • This approach was used in the referenced study to confirm the interaction between RPS29 and CYP6N3

• Tandem Affinity Purification (TAP):

  • While this typically uses tagged proteins, the RPS29 antibody can be used to validate TAP results

  • The referenced study used TAP with N-terminally tagged RPS29 to identify interacting proteins

• Functional Validation Approaches:

  • Use RPS29 antibody to monitor protein levels in overexpression or knockdown experiments

  • Combine with functional assays to correlate protein interaction with cellular outcomes

  • In the referenced study, cell viability assays (CCK-8) were used to assess the functional consequences of RPS29-CYP6N3 interaction

• FRET/BRET Analysis:

  • Use fluorescently labeled secondary antibodies against RPS29 primary antibody and antibodies against interaction partners

  • Measure energy transfer as indicator of close physical association

These approaches can be combined for comprehensive analysis of RPS29 interactions, contributing to a deeper understanding of its roles beyond canonical ribosomal functions.

How might RPS29 antibodies contribute to understanding ribosomal protein variants in disease?

RPS29 antibodies have significant potential to advance our understanding of how ribosomal protein variants contribute to disease mechanisms:

• Differential Expression Analysis:

  • RPS29 antibodies can be used to detect altered expression levels of RPS29 in various disease states

  • Western blot and IHC analyses can reveal tissue-specific or cell-type-specific changes in RPS29 expression

• Variant-Specific Studies:

  • Research has demonstrated that different variants in the same ribosomal protein gene can drive similar ribosome biogenesis defects yet have markedly different downstream consequences

  • RPS29 antibodies could be used to study how different variants affect protein stability, localization, and interaction patterns

• Cancer Research Applications:

  • The search results mention a family with multiple cancer incidences carrying an RPL9 missense variant

  • Similar approaches could be applied to study potential RPS29 variants in cancer biology

  • RPS29 antibodies would be valuable tools for investigating altered ribosome composition in cancer cells

• Translational Fidelity Assessment:

  • Some ribosomal protein variants affect translational fidelity by increasing frameshifting and stop codon readthrough

  • RPS29 antibodies could help characterize ribosomes containing variant RPS29 proteins and correlate structural changes with functional alterations

• Metabolic Profiling:

  • Different ribosomal protein variants lead to distinct metabolic signatures

  • RPS29 antibodies could help identify which cellular fractions contain variant proteins and correlate with observed metabolic changes

• Therapeutic Development:

  • Understanding how RPS29 variants contribute to disease could lead to targeted therapeutic approaches

  • RPS29 antibodies would be essential tools for screening and validating such therapeutics

By applying RPS29 antibodies in these research directions, scientists can gain deeper insights into the complex relationship between ribosomal protein variants and human disease.

What emerging techniques might enhance the utility of RPS29 antibodies in research?

Several emerging techniques have the potential to significantly enhance the utility of RPS29 antibodies in cutting-edge research:

• Single-Cell Proteomics:

  • Integration of RPS29 antibodies with single-cell analysis platforms could reveal cell-to-cell variability in RPS29 expression and localization

  • This approach would be particularly valuable for studying heterogeneous tissues or differentiation processes

• Super-Resolution Microscopy:

  • Techniques like STORM, PALM, or STED microscopy combined with RPS29 antibodies could reveal the precise subcellular localization of RPS29

  • This could provide insights into potential extraribosomal functions or localization changes under different cellular conditions

• Spatial Transcriptomics Integration:

  • Combining RPS29 antibody staining with spatial transcriptomics could correlate protein expression with localized mRNA profiles

  • This integrated approach would provide a more comprehensive view of RPS29 regulation and function

• Cryo-Electron Microscopy:

  • RPS29 antibodies could be used to identify and isolate specific ribosome subpopulations for structural analysis by cryo-EM

  • This could reveal how variants in RPS29 affect ribosome structure and potentially function

• Ribosome Profiling Enhancement:

  • RPS29 antibodies could be used to immunoprecipitate specific ribosome populations before ribosome profiling

  • This approach could reveal how RPS29 variants affect the translation of specific mRNA subsets

• Live-Cell Imaging Techniques:

  • Development of non-interfering antibody derivatives (e.g., nanobodies) against RPS29 could enable live-cell imaging of ribosome dynamics

  • This could provide insights into how RPS29 variants affect ribosome assembly and function in real-time

• Multi-Parametric Flow Cytometry:

  • Integration of RPS29 antibodies into multi-parametric flow cytometry panels could correlate RPS29 expression with other cellular markers

  • This approach was referenced in the search results for erythroid cell culture assays, which used various antibodies for FACS analysis

These emerging techniques, combined with the continuing development of more specific and sensitive RPS29 antibodies, will expand our understanding of this important ribosomal protein and its roles in health and disease.