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Structural Basis of Rnd1 Binding to Plexin Rho GTPase Binding Domains (RBDs)
Plexin receptors regulate cell adhesion, migration, and guidance. The Rho GTPase binding domain (RBD) of plexin-A1 and -B1 can bind GTPases, including Rnd1. By contrast, plexin-C1 and -D1 reportedly bind Rnd2 but associate with Rnd1 only weakly. The structural basis of this differential Rnd1 GTPase...
Autores principales: | , , , , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
American Society for Biochemistry and Molecular Biology
2011
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3138255/ https://www.ncbi.nlm.nih.gov/pubmed/21610070 http://dx.doi.org/10.1074/jbc.M110.197053 |
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author | Wang, Hui Hota, Prasanta K. Tong, Yufeng Li, Buren Shen, Limin Nedyalkova, Lyudmila Borthakur, Susmita Kim, SoonJeung Tempel, Wolfram Buck, Matthias Park, Hee-Won |
author_facet | Wang, Hui Hota, Prasanta K. Tong, Yufeng Li, Buren Shen, Limin Nedyalkova, Lyudmila Borthakur, Susmita Kim, SoonJeung Tempel, Wolfram Buck, Matthias Park, Hee-Won |
author_sort | Wang, Hui |
collection | PubMed |
description | Plexin receptors regulate cell adhesion, migration, and guidance. The Rho GTPase binding domain (RBD) of plexin-A1 and -B1 can bind GTPases, including Rnd1. By contrast, plexin-C1 and -D1 reportedly bind Rnd2 but associate with Rnd1 only weakly. The structural basis of this differential Rnd1 GTPase binding to plexin RBDs remains unclear. Here, we solved the structure of the plexin-A2 RBD in complex with Rnd1 and the structures of the plexin-C1 and plexin-D1 RBDs alone, also compared with the previously determined plexin-B1 RBD.Rnd1 complex structure. The plexin-A2 RBD·Rnd1 complex is a heterodimer, whereas plexin-B1 and -A2 RBDs homodimerize at high concentration in solution, consistent with a proposed model for plexin activation. Plexin-C1 and -D1 RBDs are monomeric, consistent with major residue changes in the homodimerization loop. In plexin-A2 and -B1, the RBD β3-β4 loop adjusts its conformation to allow Rnd1 binding, whereas minimal structural changes occur in Rnd1. The plexin-C1 and -D1 RBDs lack several key non-polar residues at the corresponding GTPase binding surface and do not significantly interact with Rnd1. Isothermal titration calorimetry measurements on plexin-C1 and -D1 mutants reveal that the introduction of non-polar residues in this loop generates affinity for Rnd1. Structure and sequence comparisons suggest a similar mode of Rnd1 binding to the RBDs, whereas mutagenesis suggests that the interface with the highly homologous Rnd2 GTPase is different in detail. Our results confirm, from a structural perspective, that Rnd1 does not play a role in the activation of plexin-C1 and -D1. Plexin functions appear to be regulated by subfamily-specific mechanisms, some of which involve different Rho family GTPases. |
format | Online Article Text |
id | pubmed-3138255 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2011 |
publisher | American Society for Biochemistry and Molecular Biology |
record_format | MEDLINE/PubMed |
spelling | pubmed-31382552011-07-28 Structural Basis of Rnd1 Binding to Plexin Rho GTPase Binding Domains (RBDs) Wang, Hui Hota, Prasanta K. Tong, Yufeng Li, Buren Shen, Limin Nedyalkova, Lyudmila Borthakur, Susmita Kim, SoonJeung Tempel, Wolfram Buck, Matthias Park, Hee-Won J Biol Chem Protein Structure and Folding Plexin receptors regulate cell adhesion, migration, and guidance. The Rho GTPase binding domain (RBD) of plexin-A1 and -B1 can bind GTPases, including Rnd1. By contrast, plexin-C1 and -D1 reportedly bind Rnd2 but associate with Rnd1 only weakly. The structural basis of this differential Rnd1 GTPase binding to plexin RBDs remains unclear. Here, we solved the structure of the plexin-A2 RBD in complex with Rnd1 and the structures of the plexin-C1 and plexin-D1 RBDs alone, also compared with the previously determined plexin-B1 RBD.Rnd1 complex structure. The plexin-A2 RBD·Rnd1 complex is a heterodimer, whereas plexin-B1 and -A2 RBDs homodimerize at high concentration in solution, consistent with a proposed model for plexin activation. Plexin-C1 and -D1 RBDs are monomeric, consistent with major residue changes in the homodimerization loop. In plexin-A2 and -B1, the RBD β3-β4 loop adjusts its conformation to allow Rnd1 binding, whereas minimal structural changes occur in Rnd1. The plexin-C1 and -D1 RBDs lack several key non-polar residues at the corresponding GTPase binding surface and do not significantly interact with Rnd1. Isothermal titration calorimetry measurements on plexin-C1 and -D1 mutants reveal that the introduction of non-polar residues in this loop generates affinity for Rnd1. Structure and sequence comparisons suggest a similar mode of Rnd1 binding to the RBDs, whereas mutagenesis suggests that the interface with the highly homologous Rnd2 GTPase is different in detail. Our results confirm, from a structural perspective, that Rnd1 does not play a role in the activation of plexin-C1 and -D1. Plexin functions appear to be regulated by subfamily-specific mechanisms, some of which involve different Rho family GTPases. American Society for Biochemistry and Molecular Biology 2011-07-22 2011-05-24 /pmc/articles/PMC3138255/ /pubmed/21610070 http://dx.doi.org/10.1074/jbc.M110.197053 Text en © 2011 by The American Society for Biochemistry and Molecular Biology, Inc. Author's Choice—Final version full access. Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) applies to Author Choice Articles |
spellingShingle | Protein Structure and Folding Wang, Hui Hota, Prasanta K. Tong, Yufeng Li, Buren Shen, Limin Nedyalkova, Lyudmila Borthakur, Susmita Kim, SoonJeung Tempel, Wolfram Buck, Matthias Park, Hee-Won Structural Basis of Rnd1 Binding to Plexin Rho GTPase Binding Domains (RBDs) |
title | Structural Basis of Rnd1 Binding to Plexin Rho GTPase Binding Domains (RBDs) |
title_full | Structural Basis of Rnd1 Binding to Plexin Rho GTPase Binding Domains (RBDs) |
title_fullStr | Structural Basis of Rnd1 Binding to Plexin Rho GTPase Binding Domains (RBDs) |
title_full_unstemmed | Structural Basis of Rnd1 Binding to Plexin Rho GTPase Binding Domains (RBDs) |
title_short | Structural Basis of Rnd1 Binding to Plexin Rho GTPase Binding Domains (RBDs) |
title_sort | structural basis of rnd1 binding to plexin rho gtpase binding domains (rbds) |
topic | Protein Structure and Folding |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3138255/ https://www.ncbi.nlm.nih.gov/pubmed/21610070 http://dx.doi.org/10.1074/jbc.M110.197053 |
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