Primary structure of the maltose-permease-encoding gene of Saccharomyces carlsbergensis

Gene
B YaoJ Marmur

Abstract

The MAL6 locus of Saccharomyces consists of a cluster of at least three genes: MAL6R encodes a positively acting regulatory protein; MAL6S encodes maltase; and MAL6T encodes maltose permease. A MAL6 Eco RI fragment, E1, that encompasses most of the MAL6T gene except for the first 90 bp of the ORF at its 5' end (sequenced previously), was cloned into a pGEM-Blue vector. Sequential deletions were generated and then sequenced. The MAL6T gene has a putative ORF of 1845 bp. The amino acid composition and sequence of the deduced protein shows that it is highly hydrophobic and has a size of 68.2 kDa. Computer-generated hydropathy profiles suggest that the MAL6T protein may have up to nine membrane-spanning regions. Generation of functional fusions of the MAL6T promoter region to Escherichia coli lacZ-containing vectors indicates that sequences in the intergenic region are responsible for the induction of MAL6T by maltose and for its carbon catabolite repression. We also demonstrated the suitability of E. coli lacZ as a reporter gene for promoter activity studies in yeast.

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