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. 1987 Jan;7(1):541–544. doi: 10.1128/mcb.7.1.541

Biochemical and biological properties of the human N-ras p21 protein.

M Trahey, R J Milley, G E Cole, M Innis, H Paterson, C J Marshall, A Hall, F McCormick
PMCID: PMC365100  PMID: 3550423

Abstract

We characterized the normal (Gly-12) and two mutant (Asp-12 and Val-12) forms of human N-ras proteins produced by Escherichia coli. No significant differences were found between normal and mutant p21 proteins in their affinities for GTP or GDP. Examination of GTPase activities revealed significant differences between the mutant p21s: the Val-12 mutant retained 12% of wild-type GTPase activity, whereas the Asp-12 mutant retained 43%. Both mutant proteins, however, were equally potent in causing morphological transformation and increased cell motility after their microinjection into quiescent NIH 3T3 cells. This lack of correlation between transforming potency and GTPase activity or guanine nucleotide binding suggests that position 12 mutations affect other aspects of p21 function.

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Selected References

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