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pubmed-article:7039676pubmed:abstractTextThe molecular structure of the plasma membrane of the haploid strain Saccharomyces cerevisiae X-2180 1 A has been studied by means of sodium dodecyl sulfate polyacrylamide gel electrophoresis. Protein and glycoprotein components have been identified and their apparent Mr determined. A glycoprotein showing an apparent Mr of 27500 has been shown to be the main structural component. Treatment of the cells with cycloheximide prior to plasma membrane isolation resulted in a redistribution of the relative amounts of each protein band and a drastic reduction in the number of Schiff positive bands. It is postulated that treatment with this drug rids the plasma membrane of glycoprotein secretory components which are in the process of being secreted to the periplasmic space, thus allowing the study of the basic structural components of the organelle. The electrophoretic pattern of the internal membranes revealed close similarities with that of the plasma membrane and though two-dimensional electrophoresis might disclose greater differences, these similarities suggest a common origin for most of the components of both membranous systems. Finally, radioiodination techniques, have been used in studying the asymmetric disposition of some of the components of the plasma membrane. At least five polypeptides were identified as located to the outer layer of the plasma membrane and two more glycopeptides were shown to span across the bilayer.lld:pubmed
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pubmed-article:7039676pubmed:pagination329-39lld:pubmed
pubmed-article:7039676pubmed:dateRevised2006-11-15lld:pubmed
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pubmed-article:7039676pubmed:year1982lld:pubmed
pubmed-article:7039676pubmed:articleTitleThe plasma membrane of Saccharomyces cerevisiae. Molecular structure and asymmetry.lld:pubmed
pubmed-article:7039676pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:7039676pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed