Positive regulatory interactions of the HIS4 gene of Saccharomyces cerevisiae
- PMID: 6095062
- PMCID: PMC368915
- DOI: 10.1128/mcb.4.7.1326-1333.1984
Positive regulatory interactions of the HIS4 gene of Saccharomyces cerevisiae
Abstract
The role of cis- and trans-acting elements in the expression of HIS4 has been examined by using HIS4-lacZ fusions in which lacZ expression is dependent upon the HIS4 5' noncoding region. The cis-acting sequences involved in regulation were defined by studying the effects of the wild-type and various deletions and their revertants on regulation via the general control of amino acid biosynthesis. The role of trans-acting genes was analyzed by studying the regulation of the HIS4-lacZ fusions in strains carrying mutations in the GCN (AAS) or GCD (TRA) genes and in strains carrying the GCN genes on high-copy-number plasmids. These studies have led to the following conclusions. (i) HIS4 is positively regulated by the general control. (ii) At least one copy of the 5'TGACTC3' repeat at -136 is required in cis for this regulation. (iii) Both the GCN4 gene and at least one copy of the repeated sequence are required for expression at the repressed level. (iv) The open reading frames in the 5' noncoding region are not required in either cis or trans for the regulation of HIS4.
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