Reference: Tohe A and Oguchi T (1999) Las21 participates in extracellular/cell surface phenomena in Saccharomyces cerevisiae. Genes Genet Syst 74(5):241-56

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Abstract


Las21 (Yj1062W) is a member of the major facilitator super family, possessing multimembrane spanning domains. The LAS21 gene was identified as a responsible gene for a Saccharomyces cerevisiae mutan which shows sensitivity to a local anestheticum, tetracaine. The null las21 mutant (las21 delta) is viable but shows temperature sensitive growth. We found, in addition to this phenotype, that the las21 delta strain shows a number of defects; mating deficiency, calcofluor resistance, and formation of Zymolyase sensitive spores. Temperature sensitive growth of the las21 delta mutant was found to be suppressed by 0.1 M MgSO4. Two multicopy suppressors were obtained. They are ECM33 (YBR078W) and PIR2/HSP150 (YJR159W) both have some roles in an extracellular function. The common features of the suppressors, genetic and physiological, of the las21 delta mutation suggest that Las21 participates in a global activity of extracellular phenomena. The las 21 phenotypes are consistent with the idea that Las21/Gpi7 acts in metabolism of glycosylphosphatidylinositol.

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Journal Article
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Tohe A, Oguchi T
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