Rac1/cdc42 Activation Magnetic Beads Pulldown Assay

Routinely evaluated by precipitating Rac1-GTP and cdc42-GTP from 3T3/A31 and HeLa cell lysates that had been loaded with GTPγS(lysates were loaded in vitro with GTPγS for cdc42-GTP). The precipitated Rac1-GTP and cdc42-GTP was detected by immunoblot analysis using anti-Rac1 (1 μg/ml).

Research Category
Cell Signaling

Signaling

Species Cross-reactivity: Human and mouse. Predicted to cross-react with all mammalian species.
Anti-Rac1, clone 23A8: Species Cross-reactivity: Human, mouse and rat. Other species cross-reactivity unknown.
Anti-cdc42 Species Cross-reactivity: Human, mouse, rat and dog. Other species cross-reactivity unknown.

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Rac1/cdc42 Activation Magnetic Beads Pulldown Assay (Cat. No. 17-10394) provides an effective method for detecting Rac and Cdc42 activity in cell lysates. This assay uses the downstream effector of Rac/Cdc42, p21-activated protein kinase (PAK1), to isolated the active GTP-bound form of Rac/Cdc42 from the sample. The p21 binding domain (PBD) of PAK1 is expressed as a GST-fusion protein and coupled to magnetic beads. After magnetic rack separation, an immunoblot is performed and the activated Rac/Cdc42 is detected with specific monoclonal antibodies, followed by HRP-conjugated secondary antibody and ECL reagent.

Rac1/cdc42 Assay Reagent (Pak-1PBD, Magnetic beads): 300 ug of Pak-1 PBD in 150 uL of glutathione magnetic beads, provided as a 50% beads slurry in PBS containing 50% glycerol for a final volume of 300 uL.

Anti-Rac1, clone 23A8: One vial containing 250 ug of purified IgG2akappa in 250 uL of storage buffer (0.1 M Tris-glycine, pH 7.4, 0.15 M NaCl, containing 0.05% sodium azide).

Anti-cdc42, mouse monoclonal IgG1: One vial containing 50 ug of purified mouse IgG1 in 200 uL of 10 mM sodium phosphate, pH 7.5, 75 mM NaCl, 0.75 mM sodium azide, 0.5 mg/mL BSA and 50% glycerol.

Mg2+ Lysis/Wash Buffer, 5X, Catalog # 20-168 : Two vials, each vial containing 18 mL of 5X MLB: 125 mM HEPES, pH 7.5, 750 mM NaCl, 5% Igepal CA-630, 50 mM MgCl₂, 5 mM EDTA and 10% glycerol.

100X GTPγS, 10mM, Catalog # 20-176: One vial containing 50 μL of 10 mM GTPγS, 100X stock, in 50 mM Tris-HCl, pH 7.8, non-hydrolyzable analog of GTP. Sufficient to label 5 mL of cell lysates.

100X GDP, 100mM, Catalog # 20-177: One vial containing 50 μL of 100 mM GDP, 100X stock, in 50 mM Tris-HCl, pH 7.8. GDP (Guanosine 5′-Diphosphate) for in vitro labeling of G-proteins in the inactive form. Sufficient to label 5ml of cell lysates.

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