The Saccharomyces cerevisiae SPR1 gene encodes a sporulation-specific exo-1,3-beta-glucanase which contributes to ascospore thermoresistance - PubMed (original) (raw)

Comparative Study

The Saccharomyces cerevisiae SPR1 gene encodes a sporulation-specific exo-1,3-beta-glucanase which contributes to ascospore thermoresistance

G Muthukumar et al. J Bacteriol. 1993 Jan.

Abstract

A number of genes have been shown to be transcribed specifically during sporulation in Saccharomyces cerevisiae, yet their developmental function is unknown. The SPR1 gene is transcribed during only the late stages of sporulation. We have sequenced the SPR1 gene and found that it has extensive DNA and protein sequence homology to the S. cerevisiae EXG1 gene which encodes an exo-1,3-beta-glucanase expressed during vegetative growth (C. R. Vasquez de Aldana, J. Correa, P. San Segundo, A. Bueno, A. R. Nebrada, E. Mendez, and F. del Ray, Gene 97:173-182, 1991). We show that spr1 mutant cells do not hydrolyze p-nitrophenyl-beta-D-glucoside or laminarin in a whole-cell assay for exo-1,3-beta-glucanases. In addition to the absence of this enzymatic activity, spr1 mutant spores exhibit reduced thermoresistance relative to isogenic wild-type spores. These observations are consistent with the notion that SPR1 encodes a sporulation-specific exo-1,3-beta-glucanase.

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The Saccharomyces cerevisiae SPR1 gene encodes a sporulation-specific exo-1,3-beta-glucanase which contributes to ascospore thermoresistance - PubMed (original) (raw)