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Published 7 July 2003. doi:10.1083/jcb.200301022
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© The Rockefeller University Press, 0021-9525/2003/7/85 $5.00
The Journal of Cell Biology, Volume 162, Number 1, 85-97

Article

 Lack of GTP-bound Rho1p in secretory vesicles of Saccharomyces cerevisiae

Mitsuhiro Abe, Hiroshi Qadota, Aiko Hirata and Yoshikazu Ohya

Department of Integrated Biosciences, Graduate School of Frontier Sciences, University of Tokyo, Kashiwa, Chiba 277-8562, Japan

Address correspondence to Yoshikazu Ohya, Dept. of Integrated Biosciences, Graduate School of Frontier Sciences, University of Tokyo, FSB-101, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8562, Japan. Tel.: 81-4-7136-3650. Fax: 81-4-7136-3651. E-mail: ohya{at}k-u-tokyo.ac.jp

Rho1p, an essential Rho-type GTPase in Saccharomyces cerevisiae, activates its effectors in the GTP-bound form. Here, we show that Rho1p in secretory vesicles cannot activate 1,3-ß-glucan synthase, a cell wall synthesizing enzyme, during vesicular transport to the plasma membrane. Analyses with an antibody preferentially reacting with the GTP-bound form of Rho1p revealed that Rho1p remains in the inactive form in secretory vesicles. Rom2p, the GDP/GTP exchange factor of Rho1p, is preferentially localized on the plasma membrane even when vesicular transport is blocked. Overexpression of Rom2p results in delocalization of Rom2p and accumulation of 1,3-ß-glucan in secretory vesicles. Based on these results, we propose that Rho1p is kept inactive in intracellular secretory organelles, resulting in repression of the activity of the cell wall–synthesizing enzyme within cells.

Key Words: RHO1; ROM2; budding yeast; 1,3-ß-glucan; antibody

* Abbreviations used in this paper: GEF, GDP/GTP exchange factor; GTP-{gamma}S, guanosine 5'-[{gamma}-thio]triphosphate; GS, 1,3-ß-glucan synthase.


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