The UAS(MAL) is a Bidirectional Promotor Element Required for the Expression of Both the MAL61 and MAL62 Genes of the Saccharomyces MAL6 Locus

Overview

Journal Curr Genet

Specialty Genetics

Date 1992 Sep 1

PMID 1525871

Citations 18

Authors

J Levine

L Tanouye

C A Michels

Affiliations

Soon will be listed here.

Abstract

Maltose fermentation in Saccharomyces yeasts requires one of five unlinked MAL loci: MAL1, 2, 3, 4, or 6. Each locus consists of three genes encoding maltose permease, maltase and the MAL activator. At MAL6 the genes are called MAL61, MAL62 and MAL63, respectively. Transcription of MAL61 and MAL62 is coordinately induced by maltose and repressed by glucose and this regulation is mediated by the MAL activator. By deletion analysis of the MAL61-MAL62 intergenic region, we show that a 68-basepair region, from base pairs -515 to -582 upstream of the MAL61 start codon, contains a sequence necessary for the maltose-induced expression of MAL61 and MAL62, the UAS(MAL). This sequence contains two copies of an 11-basepair dyad which may be the active elements of the UAS(MAL). Using heterologous gene plasmid constructs, we demonstrate that the UAS(MAL) sequence is sufficient for maltose inducibility of MAL62 and that this regulated expression requires a functional MAL activator. Our results suggest that the MAL61-MAL62 intergenic region contains additional distinct elements which function to precisely regulate MAL61 and/or MAL62 expression. Among these are repressing sequences, including a glucose-responsive element located between base pairs -583 and -638, which is partially responsible for mediating glucose-repression of MAL62 expression.

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