Integrating energy calculations with functional assays to decipher the specificity of G protein-RGS protein interactions.

Published

Journal Article

The diverse Regulator of G protein Signaling (RGS) family sets the timing of G protein signaling. To understand how the structure of RGS proteins determines their common ability to inactivate G proteins and their selective G protein recognition, we combined structure-based energy calculations with biochemical measurements of RGS activity. We found a previously unidentified group of variable 'Modulatory' residues that reside at the periphery of the RGS domain-G protein interface and fine-tune G protein recognition. Mutations of Modulatory residues in high-activity RGS proteins impaired RGS function, whereas redesign of low-activity RGS proteins in critical Modulatory positions yielded complete gain of function. Therefore, RGS proteins combine a conserved core interface with peripheral Modulatory residues to selectively optimize G protein recognition and inactivation. Finally, we show that our approach can be extended to analyze interaction specificity across other large protein families.

Full Text

Duke Authors

Cited Authors

  • Kosloff, M; Travis, AM; Bosch, DE; Siderovski, DP; Arshavsky, VY

Published Date

  • June 19, 2011

Published In

Volume / Issue

  • 18 / 7

Start / End Page

  • 846 - 853

PubMed ID

  • 21685921

Pubmed Central ID

  • 21685921

Electronic International Standard Serial Number (EISSN)

  • 1545-9985

International Standard Serial Number (ISSN)

  • 1545-9993

Digital Object Identifier (DOI)

  • 10.1038/nsmb.2068

Language

  • eng