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A yeast GTPase-activating protein that interacts specifically with a member of the Ypt/Rab family

Nature volume 361, pages 736–739 (1993)Cite this article

Abstract

MEMBERS of the Ras superfamily of GTP-binding proteins are involved in a variety of cellular processes, including signal transduction, cytoskeletal organization and protein transport1,2. GTP-binding proteins of the Ypt/Rab family direct vesicular protein transport in the secretory and endocytic pathways in the yeast Saccharomyces cerevisiae (Ypt proteins) and in mammalian systems (Rab proteins)3,4. The cellular activity of monomeric GTP-binding proteins is influenced by proteins that regulate GDP/GTP exchange and GTP hydrolysis5. GTPase-activating proteins (GAPs) can increase the slow intrinsic GTPase activity of GTP-binding proteins by several orders of magnitude6,7. As GAPs modulate the activity of GTP-binding proteins, they are thought to give a biochemical handle on the functioning of Ypt/Rab proteins in transport vesicle budding and docking or fusion at donor and acceptor membranes1,2. We report here the first cloned GTPase-activating protein for the Ypt/Rab protein family. The gene, GYP6 (GAP of Ypt6 protein), encodes a protein of 458 amino acids which is highly specific for the Ypt6 protein and shows little or no cross-reactivity with other Ypt/Rab family members or with H-Ras p21.

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Authors and Affiliations

  1. Department of Molecular Genetics, Max-Planck Institute of Biophysical Chemistry, PO Box 2841, D-3400, Göttingen, Germany

    Molly Strom, Petra Vollmer, Tjie J. Tan & Dieter Gallwitz

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  1. Molly Strom
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  2. Petra Vollmer
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  3. Tjie J. Tan
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  4. Dieter Gallwitz
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Strom, M., Vollmer, P., Tan, T. et al. A yeast GTPase-activating protein that interacts specifically with a member of the Ypt/Rab family. Nature 361, 736–739 (1993). https://doi.org/10.1038/361736a0

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