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. 1980 Aug;21(1):205-15.
doi: 10.1016/0092-8674(80)90128-2.

Identification of 23 complementation groups required for post-translational events in the yeast secretory pathway

P Novick, C Field, R Schekman

Identification of 23 complementation groups required for post-translational events in the yeast secretory pathway

P Novick et al. Cell. 1980 Aug.

Abstract

Cells of a Saccharomyces cerevisiae mutant that is temperature-sensitive for secretion and cell surface growth become dense during incubation at the non-permissive temperature (37 degrees C). This property allows the selection of additional secretory mutants by sedimentation of mutagenized cells on a Ludox density gradient. Colonies derived from dense cells are screened for conditional growth and secretion of invertase and acid phosphatase. The sec mutant strains that accumulate an abnormally large intracellular pool of invertase at 37 degrees C (188 mutant clones) fall into 23 complementation groups, and the distribution of mutant alleles suggests that more complementation groups could be found. Bud emergence and incorporation of a plasma membrane sulfate permease activity stop quickly after a shift to 37 degrees C. Many of the mutants are thermoreversible; upon return to the permissive temperature (25 degrees C) the accumulated invertase is secreted. Electron microscopy of sec mutant cells reveals, with one exception, the temperature-dependent accumulation of membrane-enclosed secretory organelles. We suggest that these structures represent intermediates in a pathway in which secretion and plasma membrane assembly are colinear.

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Comment in

  • The mechanisms of vesicle budding and fusion.
    Bonifacino JS, Glick BS. Bonifacino JS, et al. Cell. 2004 Jan 23;116(2):153-66. doi: 10.1016/s0092-8674(03)01079-1. Cell. 2004. PMID: 14744428 Review.
  • 23 genes, 23 years later.
    Schekman R, Novick P. Schekman R, et al. Cell. 2004 Jan 23;116(2 Suppl):S13-5, 1 p following S19. doi: 10.1016/s0092-8674(03)00972-3. Cell. 2004. PMID: 15055575 No abstract available.

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