Anti-Rabex-5 Antibody, clone G32

Rab5 GDP/GTP exchange factor (UniProt: Q9UJ41; also known as RAP1, Rabaptin-5-associated exchange factor for Rab5, Rabex-5) is encoded by the RABGEF1 (also known as RABEX5) gene (Gene ID: 27342) in human. Rabex-5 is a guanine nucleotide exchange factor that catalyzes the exchange of GTP for GDP on the Rab5 subfamily of low molecular weight GTPases. It forms a tight complex with Rabaptin-5 that augments its exchange activity and generates GTP-bound, membrane-associated Rab5, which in turn binds Rabaptin-5 and stabilizes the Rabex-5- Rabaptin-5 complex on endosomes. It is involved in endocytic membrane fusion and membrane trafficking of recycling endosomes. It can also act as a ubiquitin ligase. It binds to ubiquitin (Ub) through two independent ubiquitin-binding domains (UBDs). These UBDs determine a number of properties of Rabex-5, including its coupled monoubiquitination and interaction in vivo with ubiquitinated epidermal growth factor receptors. The first Ub binding region is localized in amino acids 2-49 and is named as RUZ domain (Rabex-5 ubiquitin binding zinc finger). The second Ub binding region is highly conserved and is localized in amino acids 48-74. In this domain Ala58 is shown to be critical for Ub binding and A58G mutagenesis causes significant reduction in its binding to Ub. (Ref.; Penengo, L., et al. (2006). Cell. 124. 1183-1195; Mattera, R., et al. (2006). J. Biol. Chem. 281(10); 6874-6883).

Clone G32 is a mouse monoclonal antibody that detects Rabex-5. It targets an epitope within 49 amino acids from the N-terminal region.

GST-tagged full length recombinant human Rabex-5.

Quality Control Testing

Evaluated by Western Blotting in lysates from HeLa cells.

Western Blotting Analysis (WB): A 1:1,000 dilution of this antibody detected Rabex-5 in lysates from HeLa cells transfected with either Rabex-5 siRNA or Lamin siRNA. Higher expression was detected in Lamin siRNA transfected HeLa cells.

Tested Applications

Western Blotting Analysis: A representative lot detected Rabex-5 in Western Blotting applications (Penengo, L., et al. (2006). Cell. 124(6): 1183-95).

Note: Actual optimal working dilutions must be determined by end user as specimens, and experimental conditions may vary with the end user

Anti-Rabex-5, clone G32, Cat. No. MABE1805, is a mouse monoclonal antibody that detects Rebex-5 and is tested for use in Western Blotting.

Purified mouse monoclonal antibody IgG2a in buffer containing 0.1 M Tris-Glycine (pH 7.4), 150 mM NaCl with 0.05% sodium azide.

Recommend storage at +2°C to +8°C. For long term storage antibodies can be kept at -20°C. Avoid repeated freeze-thaws.

Concentration: Please refer to the Certificate of Analysis for the lot-specific concentration.

Unless otherwise stated in our catalog or other company documentation accompanying the product(s), our products are intended for research use only and are not to be used for any other purpose, which includes but is not limited to, unauthorized commercial uses, in vitro diagnostic uses, ex vivo or in vivo therapeutic uses or any type of consumption or application to humans or animals.