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Title: Direct regulation of p190RhoGEF by activated Rho and Rac GTPases

Abstract

Rho family GTPases regulate a wide range of cellular processes. This includes cellular dynamics where three subfamilies, Rho, Rac, and Cdc42, are known to regulate cell shape and migration though coordinate action. Activation of Rho proteins largely depends on Rho Guanine nucleotide Exchange Factors (RhoGEFs) through a catalytic Dbl homology (DH) domain linked to a pleckstrin homology (PH) domain that subserves various functions. The PH domains from Lbc RhoGEFs, which specifically activate RhoA, have been shown to bind to activated RhoA. Here, p190RhoGEF is shown to also bind Rac1·GTP. Crystal structures reveal that activated Rac1 and RhoA use their effector-binding surfaces to associate with the same hydrophobic surface on the PH domain. Additionally, both activated RhoA and Rac1 can stimulate exchange of nucleotide on RhoA by localization of p190RhoGEF to its substrate, RhoA·GDP, in vitro. The binding of activated RhoA provides a mechanism for positive feedback regulation as previously proposed for the family of Lbc RhoGEFs. In contrast, the novel interaction between activated Rac1 and p190RhoGEF reveals a potential mechanism for cross-talk regulation where Rac can directly effect stimulation of RhoA. The greater capacity of Rac1 to stimulate p190RhoGEF among the Lbc RhoGEFs suggests functional specialization.

Authors:
 [1];  [1];  [1];  [1];  [1]
  1. Univ. of Texas Southwestern Medical Center, Dallas, TX (United States)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Org.:
National Institutes of Health (NIH); USDOE Office of Science (SC), Biological and Environmental Research (BER)
OSTI Identifier:
1511722
Alternate Identifier(s):
OSTI ID: 1898932
Grant/Contract Number:  
GM31954; AC02-06CH11357
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Structural Biology
Additional Journal Information:
Journal Volume: 202; Journal Issue: 1; Journal ID: ISSN 1047-8477
Publisher:
Elsevier
Country of Publication:
United States
Language:
ENGLISH
Subject:
59 BASIC BIOLOGICAL SCIENCES; RhoGEF; PH domain; GTPase; Crosstalk; Crystal structure; Membrane localization

Citation Formats

Dada, Olugbenga, Gutowski, Stephen, Brautigam, Chad A., Chen, Zhe, and Sternweis, Paul C. Direct regulation of p190RhoGEF by activated Rho and Rac GTPases. United States: N. p., 2017. Web. doi:10.1016/j.jsb.2017.11.014.
Dada, Olugbenga, Gutowski, Stephen, Brautigam, Chad A., Chen, Zhe, & Sternweis, Paul C. Direct regulation of p190RhoGEF by activated Rho and Rac GTPases. United States. https://doi.org/10.1016/j.jsb.2017.11.014
Dada, Olugbenga, Gutowski, Stephen, Brautigam, Chad A., Chen, Zhe, and Sternweis, Paul C. Tue . "Direct regulation of p190RhoGEF by activated Rho and Rac GTPases". United States. https://doi.org/10.1016/j.jsb.2017.11.014. https://www.osti.gov/servlets/purl/1511722.
@article{osti_1511722,
title = {Direct regulation of p190RhoGEF by activated Rho and Rac GTPases},
author = {Dada, Olugbenga and Gutowski, Stephen and Brautigam, Chad A. and Chen, Zhe and Sternweis, Paul C.},
abstractNote = {Rho family GTPases regulate a wide range of cellular processes. This includes cellular dynamics where three subfamilies, Rho, Rac, and Cdc42, are known to regulate cell shape and migration though coordinate action. Activation of Rho proteins largely depends on Rho Guanine nucleotide Exchange Factors (RhoGEFs) through a catalytic Dbl homology (DH) domain linked to a pleckstrin homology (PH) domain that subserves various functions. The PH domains from Lbc RhoGEFs, which specifically activate RhoA, have been shown to bind to activated RhoA. Here, p190RhoGEF is shown to also bind Rac1·GTP. Crystal structures reveal that activated Rac1 and RhoA use their effector-binding surfaces to associate with the same hydrophobic surface on the PH domain. Additionally, both activated RhoA and Rac1 can stimulate exchange of nucleotide on RhoA by localization of p190RhoGEF to its substrate, RhoA·GDP, in vitro. The binding of activated RhoA provides a mechanism for positive feedback regulation as previously proposed for the family of Lbc RhoGEFs. In contrast, the novel interaction between activated Rac1 and p190RhoGEF reveals a potential mechanism for cross-talk regulation where Rac can directly effect stimulation of RhoA. The greater capacity of Rac1 to stimulate p190RhoGEF among the Lbc RhoGEFs suggests functional specialization.},
doi = {10.1016/j.jsb.2017.11.014},
journal = {Journal of Structural Biology},
number = 1,
volume = 202,
place = {United States},
year = {Tue Nov 28 00:00:00 EST 2017},
month = {Tue Nov 28 00:00:00 EST 2017}
}

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Cited by: 6 works
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