PMID: 28498638

Authors:

Jin Y, Molt RW Jr, Pellegrini E, Cliff MJ, Bowler MW, Richards NGJ, Blackburn GM, Waltho JP

Title:

Assessing the Influence of Mutation on GTPase Transition States by Using X-ray Crystallography, 19 F NMR, and DFT Approaches.

Journal:

Angew Chem Int Ed Engl. 2017 Aug 7;56(33):9732-9735. doi: 10.1002/anie.201703074., Epub 2017 May 24.

Abstract:

We report X-ray crystallographic and 19 F NMR studies of the G-protein RhoA complexed with MgF3- , GDP, and RhoGAP, which has the mutation Arg85'Ala. When combined with DFT calculations, these data permit the identification of changes in transition state (TS) properties. The X-ray data show how Tyr34 maintains solvent exclusion and the core H-bond network in the active site by relocating to replace the missing Arg85' sidechain. The 19 F NMR data show deshielding effects that indicate the main function of Arg85' is electronic polarization of the transferring phosphoryl group, primarily mediated by H-bonding to O3G and thence to PG . DFT calculations identify electron-density redistribution and pinpoint why the TS for guanosine 5'-triphosphate (GTP) hydrolysis is higher in energy when RhoA is complexed with RhoGAPArg85'Ala relative to wild-type (WT) RhoGAP. This study demonstrates that 19 F NMR measurements, in combination with X-ray crystallography and DFT calculations, can reliably dissect the response of small GTPases to site-specific modifications.