PMID: 22584058 , Related PDB ids: 4EFL, 4EFM

Authors:

Muraoka S, Shima F, Araki M, Inoue T, Yoshimoto A, Ijiri Y, Seki N, Tamura A, Kumasaka T, Yamamoto M, Kataoka T

Title:

Crystal structures of the state 1 conformations of the GTP-bound H-Ras protein and its oncogenic G12V and Q61L mutants.

Journal:

FEBS Lett. 2012 Jun 12;586(12):1715-8. Epub 2012 May 11.

Abstract:

GTP-bound Ras adopts two interconverting conformations, "inactive" state 1 and "active" state 2. However, the tertiary structure of wild-type (WT) state 1 remains unsolved. Here we solve the state 1 crystal structures of H-Ras WT together with its oncogenic G12V and Q61L mutants. They assume open structures characterized by impaired interactions of both Thr-35 in switch I and Gly-60 in switch II with the gamma-phosphate of GTP and possess two surface pockets of mutually different shapes unseen in state 2, a potential target for selective inhibitor development. Furthermore, they provide a structural basis for the low GTPase activity of state 1.