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Mol Cell Biol. 1988 March; 8(3): 1376-1379

The structural gene for a phosphorus-repressible phosphate permease in Neurospora crassa can complement a mutation in positive regulatory gene nuc-1.

Department of Physiological Chemistry, University of Wisconsin, Madison 53706.

ABSTRACT

van+, a gene encoding a phosphorus-repressible phosphate permease, was isolated by its ability to complement nuc-1, a positive regulatory locus that normally regulates van+ expression. This was unexpected because the nuc-1 host already contained a resident van+ gene. Plasmids carrying van+ complemented a nuc-2 mutation as well. Probing of RNA from untransformed wild-type (nuc-1+) and constitutive (nuc-1c) strains by van+ probes indicated that levels of the van+ transcript were subject to control by nuc-1+. Probing of the same RNAs with a cosmid clone, containing approximately 15 kilobases of upstream and downstream DNA, revealed no other detectable phosphorus-regulated transcripts within this 40-kilobase region of the chromosome.

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