rgs-11 Antibody

Development of RGS-11 Antibody

The RGS-11 antibody was generated using a glutathione S-transferase (GST) fusion protein containing the GGL domain (amino acids 219–292) of human RGS11. Key steps included:

• Immunogen preparation: The GST-RGS11 fusion protein was expressed in E. coli and purified .

• Antibody production: Rabbits were immunized with the purified protein, and polyclonal antibodies were affinity-purified using GST-RGS11-coupled resin .

• Validation: Specificity was confirmed via immunoprecipitation and Western blotting in COS-7 cells transfected with RGS11 and Gβ5, showing selective interaction .

Key Research Applications

The RGS-11 antibody has been instrumental in:

Protein Interaction Studies

• Gβ5 binding: Coimmunoprecipitation experiments demonstrated that RGS11 forms a stable complex with Gβ5 subunits, dependent on its GGL domain .

• Subcellular localization: RGS11 and Gβ5 colocalize in cytoplasmic and particulate fractions of Sf9 insect cells .

Cancer Research

• Metastasis association: Overexpression of RGS11 in lung adenocarcinoma correlates with nodal metastasis, advanced disease stages, and poor prognosis .

• Functional role: RGS11 promotes Rac1-dependent cell migration via c-Raf/ERK/FAK signaling but requires urokinase–plasminogen activator for invasion .

Neuroscience

• Retinal signaling: In retinal ON bipolar cells, RGS11 (with RGS7) regulates the mGluR6-TRPM1 pathway, influencing light response kinetics .

• Knockout models: Double-knockout mice (RGS7⁻/⁻RGS11⁻/⁻) show intact synaptic structure but altered G protein signaling dynamics .

Table 1: Key Studies Using RGS-11 Antibody

Technical Considerations

• Specificity: The antibody recognizes the GGL domain of RGS11, with no cross-reactivity to other R7 subfamily members (e.g., RGS6, RGS7) .

• Limitations:

  • Requires coexpression with Gβ5 for stabilization in some cell lines .

  • Aggregation observed in full-length RGS11/Gβ5 complexes during gel filtration .

Clinical Implications

RGS11 is a potential biomarker for aggressive cancers, particularly lung adenocarcinoma . Its role in GPCR signaling also makes it a target for neurological and sensory disorders . Future studies may explore therapeutic modulation of RGS11-Gβ5 interactions to disrupt pathological signaling.