Recombinant human KRAS (GTPase), isoform a, encompassing amino acids 2-186 (end). In this construct the N-terminal end of the protein contains a His-tag (6xHis) followed by an optimal TEV protease target sequence that allows cleavage of the His-tag from the protein (TEV: tobacco etch virus cysteine protease Biohippo #50308). The protein also contains mutation of interest G12D. The protein was affinity purified and loaded with GDP. Unbound GDP was removed by spin column. Constructs: KRAS (G12D) (His-TEV-2-186)-(GDP)
Immunogen Region
2-186
Tag
N-terminal His-tag
Formulation
20 mM HEPES, pH 7.4, 150 mM NaCl, 1 mM DTT
Species
Human
Application
Useful for the study of enzyme kinetics, screening inhibitors, and selectivity profiling
Notes
Assay was performed according to the KRAS (G12C) Coupled Nucleotide Exchange Assay Kit (Biohippo #78004) with GDP loaded KRAS (G12C) (Biohippo #100640) and GDP loaded KRAS (G12D) (Biohippo #101312) titrated from 200 nM to 0 nM. Enzyme was incubated with SOS1; positive results show that SOS1 mediated exchange and subsequent RAS-Raf binding is successful.