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Mol Cell Biol. 1986 December; 6(12): 4478-4485

The SPS4 gene of Saccharomyces cerevisiae encodes a major sporulation-specific mRNA.

ABSTRACT

The SPS4 gene of Saccharomyces cerevisiae, a sporulation-specific gene identified previously in a differential hybridization screen of a genomic yeast DNA library, has been characterized further. The protein encoded by this gene was inferred from its nucleotide sequence to be 38,600 daltons with an isoelectric pH of 8.2. Consistent with this, two-dimensional polyacrylamide gel electrophoresis of the in vitro translation products of RNA purified by hybridization with the cloned SPS4 DNA indicated that the SPS4 gene product is a 39-kilodalton, basic protein. This protein was found to be identical in size and charge to a major, sporulation-specific protein identified in a two-dimensional polyacrylamide gel electrophoretic comparison of the in vitro translation products of total RNA from sporulating MATa/MAT alpha cells and asporogenous MAT alpha/MAT alpha cells. A MATa/MAT alpha strain homozygous for a partial deletion of the SPS4 gene appeared, however, to be unaffected in its ability to form viable ascospores.

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