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. 1974 May;118(2):534–540. doi: 10.1128/jb.118.2.534-540.1974

Porosity of the Yeast Cell Wall and Membrane1

Rene Scherrer a,2, Louise Louden a,3, Philipp Gerhardt a
PMCID: PMC246786  PMID: 4597447

Abstract

The limiting sizes of molecules that can permeate the intact cell wall and protoplast membrane of Saccharomyces cerevisiae were determined from the inflection points in a triphasic pattern of passive equilibrium uptake values obtained with a series of inert probing molecules varying in molecular size. In the phase identified with the yeast protoplast, the uptake-exclusion threshold corresponded to a monodisperse ethylene glycol of molecular weight = 110 and Einstein-Stokes hydrodynamic radius (rES) = 0.42 nm. In the cell wall phase, the threshold corresponded to a polydisperse polyethylene glycol of number-average molecular weight (¯Mn) = 620 and average radius (rES) = 0.81 nm. The third phase corresponded to complete exclusion of larger molecules. The assessment of cell wall porosity was confirmed by use of a second method involving analytical gel chromatographic analyses of the molecular weight distribution for a single polydisperse polyglycol before and after uptake by the cells, which indicated a quasi-monodisperse threshold for the cell wall of Mn = 760 and rES = 0.89 nm. The results were reconciled with two situations in which much larger protein molecules previously have been reported able to penetrate the yeast cell wall.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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