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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Hadas, Jana Dada, Olugbenga Gutowski, Stephen Carter, Angela M. Medina, Frank Sternweis, Paul C. Chen, Zhe |
| Description | Author Affiliation: Medina F ( Department of Pharmacology, University of Texas Southwestern Medical Center, Dallas, Texas 75390, USA.) |
| Abstract | The monomeric Rho GTPases are essential for cellular regulation including cell architecture and movement. A direct mechanism for hormonal regulation of the RhoA-type GTPases is their modulation by the G12 and G13 proteins via RH (RGS homology) containing RhoGEFs. In addition to the interaction of the G protein subunits with the RH domain, activated RhoA also binds to the pleckstrin homology (PH) domain of PDZRhoGEF. The latter interaction is now extended to all seven members of the homologous Lbc family of RhoGEFs which includes the RH-RhoGEFs. This is evinced by direct measurements of binding or through effects on selected signaling pathways in cells. Overexpression of these PH domains alone can block RhoA-dependent signaling in cells to various extents. Whereas activated RhoA does not modulate the intrinsic activity of the RhoGEFs, activated RhoA associated with phospholipid vesicles can facilitate increased activity of soluble RhoGEFs on vesicle-delimited substrate (RhoA-GDP). This demonstrates feasibility of the hypothesis that binding of activated RhoA to the PH domains acts as a positive feedback mechanism. This is supported by cellular studies in which mutation of this binding site on PH strongly attenuates the stimulation of RhoA observed by overexpression of five of the RhoGEF DH-PH domains. This mutation is even more dramatic in the context of full-length p115RhoGEF. The utilization of this mechanism by multiple RhoGEFs suggests that this regulatory paradigm may be a common feature in the broader family of RhoGEFs. |
| ISSN | 00219258 |
| e-ISSN | 1083351X |
| Journal | Journal of Biological Chemistry |
| Issue Number | 16 |
| Volume Number | 288 |
| Language | English |
| Publisher | American Society for Biochemistry and Molecular Biology (United States) |
| Publisher Date | 2013-04-19 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | A Kinase Anchor Proteins Metabolism Guanine Nucleotide Exchange Factors Proto-Oncogene Proteins Signal Transduction Physiology RhoA GTP-Binding Protein Genetics Animals HeLa Cells Mice Minor Histocompatibility Antigens Mutation Phospholipids Protein Structure, Tertiary Rho Guanine Nucleotide Exchange Factors Research Support, N.I.H., Extramural Research Support, Non-U.S. Gov't Biochemistry Molecular Biology |
| Content Type | Text |
| Resource Type | Article |
| Subject | Cell Biology Biochemistry Molecular Biology |
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