Reference: Kratzer S and Schüller HJ (1995) Carbon source-dependent regulation of the acetyl-coenzyme A synthetase-encoding gene ACS1 from Saccharomyces cerevisiae. Gene 161(1):75-9

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Abstract


The yeast ACS1 gene, encoding acetyl-coenzyme A synthetase (ACS), was cloned using colony hybridization and a facA probe from Aspergillus nidulans. The complete sequence of 1.5 kb of the ACS1 upstream region was determined. Northern hybridization revealed a strong depression of ACS1 transcripts in a strain grown on the nonfermentable carbon sources, acetate or ethanol. In contrast to a previous report, delta acs1 null mutants did not exhibit a growth defect on acetate medium. Indeed, enzyme assays showed the presence of an additional constitutively expressed ACS activity in delta acs1 mutants. The carbon source-dependent expression was further investigated by the use of an ACS1::lacZ fusion gene, showing complete repression on easily fermentable sugars such as glucose, maltose, sucrose or galactose. Binding sites for the yeast general regulatory factors, Abf1p and Reb1p, together with a sequence reminiscent of the recently identified carbon source-responsive element (CSRE), could be detected in the ACS1 upstream region, presumably mediating the observed regulatory phenotype of this ACS isoenzyme.

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Journal Article | Research Support, Non-U.S. Gov't
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Kratzer S, Schüller HJ
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