Reference: Denis CL and Malvar T (1990) The CCR4 gene from Saccharomyces cerevisiae is required for both nonfermentative and spt-mediated gene expression. Genetics 124(2):283-91

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Abstract


Mutations in the yeast CCR4 gene inhibit expression of the glucose-repressible alcohol dehydrogenase (ADH2), as well as other nonfermentative genes, and suppress increased ADH2 expression caused by the cre1 and cre2 alleles. Both the cre1 and ccr4 alleles were shown to affect ADH II enzyme activity by altering the levels of ADH2 mRNA. Mutations in either CRE1 or CRE2 bypassed the inhibition of ADH2 expression caused by delta insertions at the ADH2 promoter which displace the ADH2 activation sequences 336 bp upstream of the TATA element. These cre1 and cre2 effects were suppressible by the ccr4 allele. The cre1 and ccr4 mutations also affected ADH2 expression when all the ADH2 regulatory sequences upstream of the TATA element were deleted. The relationship of the CRE genes to the SPT genes, which when mutated are capable of bypassing the inhibition of HIS4 expression caused by a delta promoter insertion (his4-912 delta allele), was examined. Both the cre1 and cre2 mutations allowed his4-912 delta expression. ccr4 mutations were able to suppress the ability of the cre alleles to increase his4-912 delta expression. CRE2 was shown to be allelic to the SPT6 gene, and CRE1 was found to be allelic to SPT10. We suggest that the CRE genes comprise a general transcriptional control system in yeast that requires the function of the CCR4 gene.

Reference Type
Journal Article | Research Support, Non-U.S. Gov't | Research Support, U.S. Gov't, Non-P.H.S. | Research Support, U.S. Gov't, P.H.S.
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Denis CL, Malvar T
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