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Biological Chemistry

Editor-in-Chief: Brüne, Bernhard

Editorial Board Member: Buchner, Johannes / Lei, Ming / Ludwig, Stephan / Sies, Helmut / Turk, Boris / Wittinghofer, Alfred

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Msb4p, a Protein Involved in Cdc42p-Dependent Organization of the Actin Cytoskeleton, Is a Ypt/Rab-Specific GAP

S. Albert / D. Gallwitz
Published Online: 2005-07-05 | DOI: https://doi.org/10.1515/BC.2000.059


Ypt/Rab proteins of the Ras superfamily are regulators of protein transport in exo- and endocytosis. Like Ras and Rho proteins, they have a slow intrinsic GTPase activity that can be accelerated by several orders of magnitude by GTPase-activating proteins (GAP). Here we describe a new member of a family of Ypt/Rab-specific GAPs, Msb4p/Gyp4p, that shares with other Gyp family members significant homology in the catalytic domain, recently identified in Gyp1p and Gyp7p. Purified Msb4p/Gyp4p acts primarily on Sec4p, Ypt6p and Ypt7p and might have a role in polarized secretion.

Published Online: 2005-07-05

Published in Print: 2000-06-21

Citation Information: Biological Chemistry. Volume 381, Issue 5-6, Pages 453–456, ISSN (Print) 1431-6730, DOI: https://doi.org/10.1515/BC.2000.059, July 2005

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