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Isolation and characterisation of genes for sulphate activation and reduction in Aspergillus nidulans: implications for evolution of an allosteric control region by gene duplication

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Abstract

A region of the Aspergillus nidulans genome carrying the sA and sC genes, encoding PAPS reductase and ATP sulphurylase, respectively, was isolated by transformation of an sA mutant with a cosmid library. The genes were subcloned and their functions confirmed by retransformation and complementation of A. nidulans strains carrying sA and sC mutations. The physical distance of 2 kb between the genes corresponds to a genetic distance of 1 cM. While the deduced amino acid sequence of the sA gene product shows homology with the equivalent MET16 gene product of Saccharomyces cerevisiae, the sC gene product resembles the equivalent MET3 yeast gene product at the N-terminal end, but differs markedly from it at the C-terminal end, showing homology to the APS kinases of several microorganisms. It is proposed that this C-terminal region does not encode a functional APS kinase, but is responsible for allosteric regulation by PAPS of the sulphate assimilation pathway in A. nidulans, and that the ATP sulphurylase encoding-gene (sC) of filamentous ascomycetes may have evolved from a bifunctional gene similar to the nodQ gene of Rhizobium meliloti.

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Author notes

  1. Andrew M. Bailey

    Present address: School of Biological Sciences, University of Bath, Claverton Down, BA2 7AY, Bath, UK

Authors and Affiliations

  1. Department of Molecular Biology and Biotechnology Krebs Institute for Biomolecular Research, University of Sheffield, P.O. Box 594, S10 2UH, Sheffield, UK

    M. Ines Borges-Walmsley, Geoffrey Turner, Andrew M. Bailey & John Brown

  2. Novo Nordisk, 2880, Bagsvaerd, Denmark

    Jan Lehmbeck & Ib G. Clausen

Authors
  1. M. Ines Borges-Walmsley
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  2. Geoffrey Turner
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  3. Andrew M. Bailey
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  4. John Brown
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  5. Jan Lehmbeck
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  6. Ib G. Clausen
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Communicated by C. van den Hondel

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Ines Borges-Walmsley, M., Turner, G., Bailey, A.M. et al. Isolation and characterisation of genes for sulphate activation and reduction in Aspergillus nidulans: implications for evolution of an allosteric control region by gene duplication. Molec. Gen. Genet. 247, 423–429 (1995). https://doi.org/10.1007/BF00293143

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  • DOI: https://doi.org/10.1007/BF00293143

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