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J. Bacteriol., 08 1996, 4724-4726, Vol 178, No. 15
Copyright © 1996, American Society for Microbiology

Members of the Hsp70 family of proteins in the cell wall of Saccharomyces cerevisiae

JL Lopez-Ribot and WL Chaffin
Department of Microbiology and Immunology, Texas Tech University Health Sciences Center, Lubbock, 79430, USA.

Western blot (immunoblot) analysis of cell wall and cytosolic extracts obtained from parental and ssa1 and ssa2 single- and double-mutant strains of Saccharomyces cerevisiae showed that the heat shock protein 70 (Hsp70) products of these genes, previously thought to be restricted to the cell interior, are also present in the cell wall. A cell wall location was further confirmed by indirect immunofluorescence with intact cells and biotinylation of extracellular Hsp70. Hsp70s have been implicated in translocation across the membrane and as molecular chaperones, and changes in the profile of cell wall proteins suggested that these proteins may have a similar role in the cell wall.


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