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JCS ePress online publication date 9 Nov 2004
doi: 10.1242/jcs.01493

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Research Article

Distribution of Can1p into stable domains reflects lateral protein segregation within the plasma membrane of living S. cerevisiae cells


Katerina Malinska, Jan Malinsky, Miroslava Opekarova, and Widmar Tanner*
* Author for correspondence (e-mail: sekretariat.tanner{at}biologie.uni-regensburg.de)

Recently, lipid-raft-based subdomains within the plasma membrane of living Saccharomyces cerevisiae cells were visualized using green fluorescent protein fusions, and non-overlapping subdomains containing either Pma1p or Can1p were distinguished. In this study, the long-term stability of the subdomains was investigated. Experiments with latrunculin A and nocodazole ruled out the involvement of cytoskeletal components in the stabilization of the subdomains. Also a putative role of the cell wall was excluded, because protoplasting of the cells changed neither the pattern nor the stability of the subdomains. By contrast, the expected inner dynamics of the membrane subdomains was documented by FRAP experiments. Finally, two other proteins were localized within the frame of the Can1p/Pma1p plasma-membrane partition. We show that Fur4p (another H+ symporter) and Sur7p (a protein of unknown function) occupy the Can1p subdomain.
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