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Comparative Study
. 1991 Jan 1;88(1):204-8.
doi: 10.1073/pnas.88.1.204.

crnA encodes a nitrate transporter in Aspergillus nidulans

Affiliations
Comparative Study

crnA encodes a nitrate transporter in Aspergillus nidulans

S E Unkles et al. Proc Natl Acad Sci U S A. .

Erratum in

  • Proc Natl Acad Sci U S A 1991 May 15;88(10):4564
  • Proc Natl Acad Sci U S A 1995 Mar 28;92(7):3076

Abstract

The nucleotide sequence of the Aspergillus nidulans crnA gene for the transport of the anion nitrate has been determined. The crnA gene specifies a predicted polypeptide of 483 amino acids (molecular weight 51,769). A hydropathy plot suggests that this polypeptide has 10 membrane-spanning helices with an extensive hydrophilic region between helices six and seven. No striking homology was observed between the crnA protein and other reported membrane proteins of either prokaryotic or eukaryotic organisms, indicating that the crnA transporter may represent another class of membrane protein. Northern blotting results with wild-type cells show that (i) control of crnA expression is subject to nitrate (and nitrite) induction as well as nitrogen metabolite repression and (ii) regulation of the crnA gene is exerted at the level of mRNA accumulation, most likely at transcription, in response to the nitrogen source in the growth medium. Furthermore, similar studies with mutants of nirA and areA control genes and the niaD nitrate reductase structural gene show that crnA expression is mediated by the products of nirA (nitrate induction control gene), areA (nitrogen metabolite repression control gene), and niaD (involved in autoregulation of nitrate reductase).

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