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. 1991 Oct;173(20):6332–6338. doi: 10.1128/jb.173.20.6332-6338.1991

Participation of ABF-1 protein in expression of the Saccharomyces cerevisiae CAR1 gene.

L Z Kovari 1, T G Cooper 1
PMCID: PMC208964  PMID: 1917865

Abstract

DNA fragments previously shown to be required for expression of the CAR1 (arginase) gene in Saccharomyces cerevisiae and to support transcriptional activation of a reporter gene in a heterologous expression vector were shown to bind purified regulatory protein ABF-1. Two ABF-1 sites were identified in the CAR1 upstream region, one to which ABF-1 protein bound with high affinity and a second to which it bound much less avidly. The higher-affinity ABF-1 binding site upstream of CAR1 was an effective competitor of the HMRE, ARS1 B domain, and COR2-GFI binding sequences for protein binding. Point mutations in the CAR1 high-affinity ABF-1 binding site resulted in a 12-fold loss of transcriptional activation of a reporter gene compared with the wild-type CAR1 DNA fragment. These data are consistent with the suggestion that ABF-1 protein is one of the transcription factors involved in expression of the CAR1 gene.

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