Product Uses Include
- Cdc42 effector and GAP identification and binding studies
- Activation of Cdc42 effectors in vitro and in vivo
- Stimulation of Cdc42 phenotype by microinjection into cells
Material
The constitutively active form of human Cdc42 protein contains a glutamine to leucine substitution at residue 61. The common name for this mutant is Cdc42(Q61L) or L61Cdc42. The leucine substitution prevents endogenous and GAP-stimulated GTPase activity of Cdc42, hence the protein is always in the active, GTP-bound, state. A similar mutation in Ras (Ras(Q61L)) behaves as an oncogenic mutation.
Cdc42(Q61L) has been expressed in a bacterial system. The protein is supplied as a lyophilized powder. When it is reconstituted in distilled water to 1 mg/ml, the protein is in the following buffer: 2 mM Tris pH 7.6, 0.5 mM MgCl2 0.5% sucrose and 0.1% dextran. Protein concentration is determined by the Precision Red Advanced Protein Assay Reagent (Cat. # ADV02).
The recombinant protein is 25 kDa, consisting of the 22 kDa Cdc42 constitutively active protein plus a histidine tag in the amino-terminus.
For other forms of Cdc42 as well as many other purified small G-proteins, see our main small G-protein product page.
Purity
Protein purity is determined by scanning densitometry of Coomassie Blue stained protein on a 12% polyacrylamide gel. His-Cdc42(Q61L) protein was determined to be > 70% pure.
Figure 1: His-Cdc42(Q61L) protein purity determination. A 10 ug sample of C6101 (His-Cdc42(Q61L) molecular weight approx. 25 kDa) was separated by electrophoresis in a 12% SDS-PAGE system, and stained with Coomassie Blue.
Biological Activity
His-Cdc42(Q61L) mutant protein binds GTP but its intrinsic GTPase activity has been eliminated, resulting in a constitutively active protein. The biological assay for His-Cdc42(Q61L) activity consists of a pulldown assay using PAK-PBD beads (Cat. # PAK02). The PAK protein is an effector of Cdc42 and will specifically bind to active GTP-Cdc42. Stringent quality control ensures that > 80% of His-Cdc42(Q61L) protein can be pulled down using this method.