Time-resolved X-ray crystallographic study of the conformational change in Ha-Ras p21 protein on GTP hydrolysis
- 1 May 1990
- journal article
- research article
- Published by Springer Nature in Nature
- Vol. 345 (6273), 309-315
- https://doi.org/10.1038/345309a0
Abstract
Crystals of Ha-Ras p21 with caged GTP at the active site have been used to investigate the conformational changes of p21 on GTP hydrolysis. The structure of the short-lived p21-GTP complex was determined by Laue diffraction methods. After GTP hydrolysis, substantial structural changes occur in the parts of the molecule implicated in the interaction with GTPase-activating protein. The trigger for this process seems to be a change in coordination of the active-site Mg2+ion as a result of loss of the γ-phosphate of GTP.Keywords
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