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A yeast gene (BEM1) necessary for cell polarization whose product contains two SH3 domains

Nature volume 356, pages 77–79 (1992)Cite this article

Abstract

CELL polarization requires that a cellular axis or cell-surface site be chosen and that the cytoskeleton be organized with respect to it. Details of the link between the cytoskeleton and the chosen axis or site are not clear1. Cells of the yeast Saccharomyces cerevisiae exhibit cell polarization in two phases of their life cycle, during vegetative growth and during mating, which reflects responses to intracellular and extracellular signals, respectively. Here we describe the isolation of two mutants defective specifically in cell polarization in response to peptide mating pheromones. The mutants carry special alleles (denoted bem1-s) of the BEM1 gene required for cell polarization during vegetative growth2,3. Unlike other beml mutants, the bem1-s mutants are normal for vegetative growth. Complete deletion of BEM1 leads to the defect in polarization of vegetative cells seen in beml mutants23. The predicted sequence of the BEM1 protein (Bem1p) reveals two copies of a domain (denoted SH3) that is found in many proteins associated with the cortical cytoskeleton and which may mediate binding to actin or some other component of the cell cortex4,5. The sequence of Bemlp and the properties of mutants defective in this protein indicate that it may link the cytoskeleton to morphogenetic determinants on the cell surface.

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Author information

Author notes

  1. Kathleen Corrado

    Present address: Department of Human Genetics, University of Michigan, Ann Arbor, Michigan, 48109, USA

  2. Alan Bender

    Present address: Department of Biology, Indiana University, Bloomington, Indiana, 47405, USA

  3. John Pringle

    Present address: Department of Biology, University of North Carolina, Chapel Hill, North Carolina, 27599, USA

Affiliations

  1. Department of Biochemistry and Biophysics, University of California, San Francisco, California, 94143, USA

    Janet Chenevert & Ira Herskowitz

  2. Department of Biology, University of Michigan, Ann Arbor, Michigan, 48109, USA

    Kathleen Corrado, Alan Bender & John Pringle

Authors
  1. Janet Chenevert
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  2. Kathleen Corrado
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  3. Alan Bender
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  4. John Pringle
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  5. Ira Herskowitz
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Chenevert, J., Corrado, K., Bender, A. et al. A yeast gene (BEM1) necessary for cell polarization whose product contains two SH3 domains. Nature 356, 77–79 (1992). https://doi.org/10.1038/356077a0

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