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. 1989 Nov;9(11):5045–5054. doi: 10.1128/mcb.9.11.5045

Molecular analysis of the SNF4 gene of Saccharomyces cerevisiae: evidence for physical association of the SNF4 protein with the SNF1 protein kinase.

J L Celenza 1, F J Eng 1, M Carlson 1
PMCID: PMC363656  PMID: 2481228

Abstract

The SNF4 gene is required for expression of glucose-repressible genes in response to glucose deprivation in Saccharomyces cerevisiae. Previous evidence suggested that SNF4 is functionally related to SNF1, another essential gene in this global regulatory system that encodes a protein kinase. Increased SNF1 gene dosage partially compensates for a mutation in SNF4, and the SNF4 function is required for maximal SNF1 protein kinase activity in vitro. We have cloned SNF4 and identified its 1.2-kilobase RNA, which is not regulated by glucose repression. A 36-kilodalton SNF4 protein is predicted from the nucleotide sequence. Disruption of the chromosomal SNF4 locus revealed that the requirement for SNF4 function is less stringent at low temperature (23 degrees C). A bifunctional SNF4-lacZ gene fusion that includes almost the entire SNF4 coding sequence was constructed. The fusion protein was shown by immunofluorescence microscopy to be distributed throughout the cell, with partial localization to the nucleus. The SNF4-beta-galactosidase protein coimmunoprecipitated with the SNF1 protein kinase, thus providing evidence for the physical association of the two proteins.

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