1zw6

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Revision as of 18:35, 12 November 2007

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spinqualitylabelsall models 1zw6, resolution 1.50Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image

Crystal Structure of the GTP-bound form of RasQ61G

Contents 1 Overview 2 Disease 3 About this Structure 4 Reference

Overview

The flexibility of the conserved 57DTAGQ61 motif is essential for Ras, proper cycling in response to growth factors. Here, we increase the, flexibility of the 57DTAGQ61 motif by mutating Gln61 to Gly. The crystal, structure of the RasQ61G mutant reveals a new conformation of switch 2, that bears remarkable structural homology to an intermediate for GTP, hydrolysis revealed by targeted molecular dynamics simulations. The, mutation increased retention of GTP and inhibited Ras binding to the, catalytic site, but not to the distal site of Sos. Most importantly, the, thermodynamics of RafRBD binding to Ras are altered even though the, structure of switch 1 is not affected by the mutation. Our results suggest, that interplay and transmission of structural information between the, switch regions are important factors for Ras function. They propose that, initiation of GTP hydrolysis sets off the separation of the Ras/effector, complex even before the GDP conformation is reached.

Disease

Known diseases associated with this structure: Bladder cancer, somatic OMIM:[190020], Costello syndrome OMIM:[190020], Thyroid carcinoma, follicular, somatic OMIM:[190020]

About this Structure

1ZW6 is a Single protein structure of sequence from Homo sapiens with MG, CA and GNP as ligands. Full crystallographic information is available from OCA.

Reference

Structure of a transient intermediate for GTP hydrolysis by ras., Ford B, Hornak V, Kleinman H, Nassar N, Structure. 2006 Mar;14(3):427-36. PMID:16531227

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