Isolation and composition of the constitutive agglutinins from haploid Saccharomyces cerevisiae cells |
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Authors: | P C Sijmons A J A Nederbragt F M Klis H Van Den Ende |
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Institution: | (1) Department of Plant Physiology, Biotechnology Center, University of Amsterdam, Kruislaan 318, NL-1098 SM Amsterdam, The Netherlands;(2) Present address: MOGEN International BV, Einsteinweg 97, NL-2333 CB Leiden, The Netherlands |
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Abstract: | Sex-specific agglutinins from the cell surface of haploid cells of Saccharomyces cerevisiae (X2180, mta and mt ) were purified and analysed. The constitutive agglutinin from mta cells was extractable with 3 mM dithiothreitol. It was shown to be a glycoprotein (3% mannose) with an apparent Mr of 43,000 based on gel filtration, but in SDS-PAGE it behaved as a much smaller molecule (Mr between 18,000 and 26,000). About one in three amino acids was a hydroxyamino acid. Its biological activity was resistant to boiling for 1 h, but sensitive to pronase. Intact mt cells retained their agglutinability in the presence of dithiothreitol but limited trypsinizing released a biologically active agglutinin fragment. It had an apparent Mr of 320,000 (gel filtration). When analysed by SDS-PAGE, a single diffuse band with an apparent Mr of 225,000 was observed. The protein was 94% (w/w) mannose with a trace of N-acetyl glucosamine. Its biological activity was almost completely lost after boiling for 1 h. Both agglutinins behaved as monovalent molecules and specifically inhibited the biological activity of both noninduced and pheromone-induced cells. Pheromone treatment of mta cells resulted in an apparent 32-fold increase in agglutinin activity at the cell surface, whereas pheromone treatment of mt cells only doubled the apparent agglutinin activity.Abbreviations mt
mating type
- DTT
dithiothreitol
- SDS-PAGE
sodium dodecyl sulphate polyacrylamide gel electrophoresis
- YPG
yeast-peptone-glucose
- PAS
periodic-acid-Schiff reagent |
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Keywords: | Saccharomyces cerevisiae Yeast mating Cell-cell recognition Sexual agglutination Agglutinins |
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