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Science 13 October 2000:
Vol. 290. no. 5490, pp. 341 - 344
DOI: 10.1126/science.290.5490.341
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Reports

Plasma Membrane Compartmentalization in Yeast by Messenger RNA Transport and a Septin Diffusion Barrier

Peter A. Takizawa,1 Joseph L. DeRisi,2 James E. Wilhelm,1 Ronald D. Vale13*

Asymmetric localization of proteins plays a key role in many cellular processes, including cell polarity and cell fate determination. Using DNA microarray analysis, we identified a plasma membrane protein-encoding mRNA (IST2) that is transported to the bud tip by an actomyosin-based process. mRNA localization created a higher concentration of IST2 protein in the bud compared with that of the mother cell, and this asymmetry was maintained by a septin-mediated membrane diffusion barrier at the mother-bud neck. These results indicate that yeast creates distinct plasma membrane compartments, as has been described in neurons and epithelial cells.

1 Department of Cellular and Molecular Pharmacology and
2 Department of Biochemistry/Biophysics, and
3 Howard Hughes Medical Institute, University of California, San Francisco, CA 94143, USA.
*   To whom correspondence should be addressed. E-mail: vale{at}phy.ucsf.edu

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