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. 1987 Nov;7(11):3888–3898. doi: 10.1128/mcb.7.11.3888

Genetic and biochemical characterization of clathrin-deficient Saccharomyces cerevisiae.

G S Payne 1, T B Hasson 1, M S Hasson 1, R Schekman 1
PMCID: PMC368056  PMID: 3323882

Abstract

Clathrin is important but not essential for yeast cell growth and protein secretion. Diploid Saccharomyces cerevisiae cells heterozygous for a clathrin heavy-chain gene (CHC1) disruption give rise to viable, slow-growing, clathrin heavy-chain-deficient meiotic progeny (G. Payne and R. Schekman, Science 230:1009-1014, 1985). The possibility that extragenic suppressors account for growth of clathrin-deficient cells was examined by deletion of CHC1 from haploid cell genomes by single-step gene transplacement and independently by introduction of a centromere plasmid carrying the complete CHC1 gene into diploid cells before eviction of a chromosomal CHC1 locus and subsequent tetrad analysis. Both approaches yielded clathrin-deficient haploid strains. In mutants missing at least 95% of the CHC1 coding domain, transcripts related to CHC1 were not detected. The time course of invertase modification and secretion was measured to assess secretory pathway functions in the viable clathrin-deficient cells. Core-glycosylated invertase was converted to the mature, highly glycosylated form at equivalent rates in mutant and wild-type cells. Export of mature invertase from mutant cells was delayed but not prevented. Abnormal vacuoles, accumulated vesicles, and Golgi body-derived structures were visualized in mutant cells by electron microscopy. We conclude that extragenic suppressors do not account for the viability of clathrin-deficient cells and, furthermore, that many standard laboratory strains can sustain a CHC1 disruption. Clathrin does not appear to mediate protein transfer from the endoplasmic reticulum to the Golgi body but may function at a later stage of the secretory pathway.

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Selected References

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