RLK10 Antibody

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Description

Rab10 Antibody: Functional Role and Development

Rab10 is a small GTPase phosphorylated at Thr73 by leucine-rich repeat kinase 2 (LRRK2), a kinase linked to PD. Antibodies targeting phosphorylated Rab10 (pT73 Rab10) enable quantification of LRRK2 activity, a biomarker for PD progression and therapeutic response .

  • Key Antibodies:

    • MJFF-pRab10: A monoclonal antibody developed to detect LRRK2-phosphorylated Rab10 at Thr73. It shows no cross-reactivity with other LRRK2 substrates (e.g., Rab8A, Rab12) .

    • Phospho-specific Rab10 assays: Used in Meso Scale Discovery (MSD) platforms to measure LRRK2 activity in peripheral blood mononuclear cells (PBMCs) and neutrophils .

Performance Metrics of Rab10 Antibody Assays

Rab10 antibody assays exhibit high sensitivity and specificity in both cellular and clinical samples:

ParameterpT73 Rab10 AssayTotal Rab10 Assay
Linear Range (ng/mL)65.2–8,3500.6–45.7
Lower Limit of Detection8.36 ng/mL0.02 ng/mL
SpecificityNo cross-reactivity with RAB8A or LRRK2 KO cells Confirmed in RAB10 KO models
Clinical UtilityDetects elevated LRRK2 activity in PD patients Monitors Rab10 expression in inflammatory models

Biomarker Analysis in Parkinson’s Disease

  • LRRK2 G2019S Carriers: Rab10 phosphorylation is significantly elevated in PBMCs from patients with the G2019S mutation .

  • Protective Haplotype (N551K R1398H): Reduces Rab10 phosphorylation by 30–50% in cellular and human subject models, suggesting a mechanism for reduced PD risk .

Pharmacodynamic Studies

  • LRRK2 Inhibitors: Ex vivo treatment of PBMCs with MLi-2 (LRRK2 inhibitor) reduces pT73 Rab10 levels dose-dependently (IC₅₀ ≈ 10 nM) .

  • Neutrophil-Based Assays: Neutrophils show higher LRRK2/Rab10 expression than PBMCs, making them optimal for clinical trials .

Validation and Reproducibility

  • Standardized Protocols: Eight commercial Rab10 antibodies were validated for western blot, immunoprecipitation, and immunofluorescence using knockout cell lines .

  • Interassay Variability:

    • Total LRRK2 levels in neutrophils varied ≤8-fold across donors .

    • pT73 Rab10 signal reduced by >90% in LRRK2 KO models .

Limitations and Future Directions

  • Heterogeneity in PBMCs: Only monocytes and neutrophils express detectable LRRK2, limiting PBMC utility .

  • Need for Longitudinal Data: Current studies are cross-sectional; larger cohorts are required to establish Rab10 phosphorylation as a PD biomarker .

Product Specs

Buffer
Preservative: 0.03% Proclin 300
Composition: 50% Glycerol, 0.01M PBS, pH 7.4
Form
Liquid
Lead Time
Made-to-order (14-16 weeks)
Synonyms
RLK10 antibody; RLCK276 antibody; Os09g0511000 antibody; LOC_Os09g33630 antibody; OsJ_29979 antibody; LysM domain receptor-like kinase 10 antibody; OsLysM-RLK10 antibody; EC 2.7.11.1 antibody; LysM-containing receptor-like kinase 10 antibody; Receptor-like cytoplasmic kinase 276 antibody; OsRLCK276 antibody
Target Names
RLK10
Uniprot No.

Target Background

Database Links
Protein Families
Protein kinase superfamily, Ser/Thr protein kinase family
Subcellular Location
Cell membrane; Single-pass membrane protein.

Q&A

What is RLK10 and why is it significant in plant research?

RLK10 is a receptor-like kinase found in Oryza sativa subsp. japonica (Rice). Receptor-like kinases (RLKs) are crucial signaling molecules in plants that mediate various developmental processes and responses to environmental stimuli. Recent studies have revealed that RLKs play significant roles in mediating molecular dialogue among plant tissues, including in reproductive processes . Understanding RLK10's function through antibody-based detection methods can provide insights into plant signaling cascades and developmental biology.

What applications are RLK10 antibodies validated for?

The commercially available RLK10 antibody has been validated primarily for ELISA and Western Blot (WB) applications. These techniques allow for the identification and quantification of the antigen in research samples . While the current validation focuses on these applications, researchers should note that additional optimization may be required for other experimental techniques.

What are the optimal storage conditions for RLK10 antibodies?

RLK10 antibodies should be stored at -20°C or -80°C immediately upon receipt. It's critical to avoid repeated freeze-thaw cycles as this can compromise antibody integrity and performance. The antibody is typically supplied in a storage buffer containing 50% Glycerol, 0.01M PBS at pH 7.4, with 0.03% Proclin 300 as a preservative to maintain stability during storage .

How can researchers validate the specificity of RLK10 antibodies in their experimental system?

When working with RLK10 antibodies, specificity validation is crucial. A comprehensive validation approach should include:

  • Positive controls using recombinant Oryza sativa RLK10 protein

  • Negative controls using extracts from tissues known not to express RLK10

  • Competitive binding assays with purified antigen

  • When possible, knockout/knockdown approaches similar to those used for other antibody validations

  • Cross-reactivity testing against similar receptor-like kinases

Drawing from methodologies developed for other research antibodies, knockout cell lines have proven invaluable for antibody validation . Though the RLK10 antibody is raised against rice proteins, researchers should establish rigorous validation protocols appropriate for their specific plant model system.

What are potential cross-reactivity concerns when using RLK10 antibodies in non-rice plant species?

When applying RLK10 antibodies to different plant species, researchers should consider potential cross-reactivity issues. While the commercial RLK10 antibody is specifically raised against rice (Oryza sativa) RLK10 protein , the conservation of receptor-like kinase domains across plant species may result in cross-reactivity. Researchers should:

  • Conduct preliminary Western blot analysis to assess binding patterns

  • Compare sequence homology between rice RLK10 and the target species' potential homologs

  • Include appropriate controls when attempting cross-species applications

  • Consider epitope mapping to understand which protein regions the antibody recognizes

The approach of using knockout/knockin controls, as demonstrated with Rab10 antibodies , provides a gold standard for verifying antibody specificity in cross-species applications.

How can phosphorylation status of RLK10 be assessed in signaling studies?

While the current commercial antibody targets total RLK10 protein , researchers interested in phosphorylation-dependent signaling might consider approaches similar to those developed for other kinases. Drawing from methodologies used for phospho-specific antibodies in other systems :

  • Phosphorylation site prediction using bioinformatics tools specific for plant kinases

  • Development or commissioning of phospho-specific antibodies targeting predicted sites

  • Implementation of phosphatase treatments as controls

  • Correlation of kinase activity with biological outcomes through genetic approaches

  • Use of tyramide signal amplification for detecting low-abundance phospho-proteins

What protocol modifications are recommended for optimal Western blot results with RLK10 antibodies?

Based on technical information and drawing from methodological approaches used with other antibodies, researchers should consider these optimization steps for Western blot applications:

  • Sample preparation: Use extraction buffers containing protease inhibitors to prevent degradation

  • Protein loading: 20-50 μg of total protein is typically recommended

  • Antibody dilution: Begin with a 1:500 dilution and optimize as needed

  • Blocking: 5% non-fat dry milk or BSA in TBST

  • Incubation time: Primary antibody incubation overnight at 4°C

  • Detection system: Choose based on expected expression levels, with chemiluminescence providing good sensitivity

Researchers should verify the molecular weight of RLK10 in their specific plant system and compare results with expected patterns.

How can researchers amplify weak RLK10 signals in immunofluorescence applications?

Although the commercial RLK10 antibody is not specifically validated for immunofluorescence , researchers attempting this application might consider signal amplification techniques. Drawing from approaches used for other low-abundance proteins:

  • Tyramide signal amplification (TSA) can significantly enhance detection sensitivity, as demonstrated for phospho-Rab10 detection

  • Optimize fixation conditions, as overfixation may mask epitopes

  • Consider antigen retrieval methods appropriate for plant tissues

  • Use high-sensitivity detection systems with minimal background

  • Implement appropriate controls to distinguish specific from non-specific signals

What considerations are important when designing co-immunoprecipitation experiments with RLK10 antibodies?

For researchers planning co-immunoprecipitation (Co-IP) to study RLK10 protein interactions:

  • Antibody efficiency: Test the antibody's immunoprecipitation efficiency using recombinant RLK10

  • Buffer optimization: Membrane proteins like receptor kinases often require specialized extraction conditions

  • Cross-linking: Consider reversible cross-linking to stabilize transient interactions

  • Pre-clearing: Implement rigorous pre-clearing steps to reduce non-specific binding

  • Controls: Include appropriate negative controls (non-specific IgG, immunodepleted samples)

Successful Co-IP protocols developed for other membrane proteins might serve as useful starting points, though specific optimization for RLK10 will likely be necessary.

How can researchers address non-specific binding issues with RLK10 antibodies?

When encountering non-specific binding:

  • Increase blocking stringency using 5% BSA instead of milk proteins

  • Optimize antibody dilution through systematic testing

  • Include additional washing steps with increased detergent concentration

  • Pre-absorb the antibody with plant extracts from tissues not expressing the target

  • Compare results from multiple antibody lots if possible

The polyclonal nature of the commercial RLK10 antibody may contribute to some non-specific binding, requiring careful optimization.

What quality control measures should be implemented when using RLK10 antibodies in long-term studies?

To ensure consistent results in longitudinal studies:

  • Aliquot antibodies upon receipt to minimize freeze-thaw cycles

  • Include consistent positive controls across experiments

  • Document lot numbers and maintain reference samples

  • Periodically revalidate antibody performance, especially with new lots

  • Standardize all experimental conditions, including blocking reagents and incubation times

Following rigorous standardization protocols similar to those established for other research antibodies will enhance reproducibility.

How might RLK10 antibodies contribute to understanding plant signaling networks?

Receptor-like kinases are integral to plant signaling networks, and antibody-based approaches can provide valuable insights:

  • Proximity labeling techniques combined with RLK10 antibodies can map protein interaction networks

  • Phospho-proteomic studies may reveal downstream targets of RLK10 signaling

  • Tissue-specific and developmental expression patterns can be assessed through optimized immunohistochemistry

  • Potential roles in plant reproductive development may be explored given the involvement of RLKs in these processes

What methodological advances might enhance the utility of RLK10 antibodies in the future?

Future methodological developments might include:

  • Development of monoclonal antibodies with enhanced specificity

  • Creation of phospho-specific antibodies targeting regulatory phosphorylation sites

  • Adaptation of multiplex detection systems to study RLK10 in complex with other signaling components

  • Integration with advanced imaging techniques for subcellular localization studies

  • Development of nanobody or recombinant antibody fragments for improved tissue penetration

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