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Science 5 March 1993:
Vol. 259. no. 5100, pp. 1466 - 1468
DOI: 10.1126/science.8451644
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Articles

Science, Vol 259, Issue 5100, 1466-1468
Copyright © 1993 by American Association for the Advancement of Science

articles

Requirement for a GTPase-activating protein in vesicle budding from the endoplasmic reticulum

T Yoshihisa, C Barlowe, and R Schekman

Howard Hughes Medical Institute, Department of Molecular and Cell Biology, University of California, Berkeley 94720.

The binding and hydrolysis of guanosine triphosphate (GTP) by the small GTP-binding protein Sar1p is required to form transport vesicles from the endoplasmic reticulum (ER) in Saccharomyces cerevisiae. Experiments revealed that an interaction between Sar1p and the Sec23p subunit of an oligomeric protein is also required for vesicle budding. The isolated Sec23p subunit and the oligomeric complex stimulated guanosine triphosphatase (GTPase) activity of Sar1p 10- to 15-fold but did not activate two other small GTP-binding proteins involved in vesicle traffic (Ypt1p and ARF). Activation of GTPase was inhibited by an antibody to Sec23p but not by an antibody that inhibits the budding activity of the other subunit of the Sec23p complex. Also, activation was thermolabile in pure samples of Sec23p that were isolated from two independent sec23 mutant strains. It appears that Sec23p represents a new class of GTPase-activating protein because its sequence shows no similarity to any known member of this family.


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