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. 1996 Jun 15;24(12):2395–2403. doi: 10.1093/nar/24.12.2395

Interactions of the yeast centromere and promoter factor, Cpf1p, with the cytochrome c1 upstream region and functional implications on regulated gene expression.

U Oechsner 1, W Bandlow 1
PMCID: PMC145936  PMID: 8710512

Abstract

The upstream activation site (UAS) of the cytochrome c1 gene, CYT1, contains sequences for DNA-binding of several transcription factors. Among them are the heme-dependent protein, Hap1p, and the multiprotein complex, Hap2/3/4/5, which mediate transcriptional induction under aerobic conditions and after exhaustion of glucose, respectively. The multiple interactions of nuclear proteins with the UAS region of CYT1 observed in electrophoretic mobility shift experiments are influenced by carbon source and oxygen tension, but are independent of both regulators, Hap1p and Hap2/3/4/5. All protein-DNA complexes obtained are solely due to the association of the centromere and promoter factor 1 (Cpf1p) with the centromere determining element (CDE I)-like motif at the 5' boundary of the UAS(CYT1). This motif overlaps with a consensus sequence for the binding of the general factor Abf1p. Functional analyses after the separate introduction of point mutations into both elements reveal no role for the latter protein and only a minor role for Cpf1p in the regulated expression of CYT1/lacZ chimaeric proteins. However, in cpf1-mutants, induction of CYT1 reaches higher steady state levels and adaptation to aerobic conditions occurs faster than in wild-type. Thus, Cpf1p seems to reduce CYT1 promoter activity under partly inducing conditions, e.g. when only one of the activators, Hap1p or the Hap2 complex, exerts its function.

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Selected References

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