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Molecular Genetics and Genomics

, Volume 274, Issue 3, pp 283–294 | Cite as

Characterization of the oat1 gene of Penicillium chrysogenum encoding an ω-aminotransferase: induction by L-lysine, L-ornithine and L-arginine and repression by ammonium

  • Leopoldo Naranjo
  • Mònica Lamas-Maceiras
  • Ricardo V. Ullán
  • Sonia Campoy
  • Fernando Teijeira
  • Javier Casqueiro
  • Juan F. MartínEmail author
Original Paper

Abstract

The Penicillium chrysogenum oat1 gene, which encodes a class III ω-aminotransferase, was cloned and characterized. This enzyme converts lysine into 2-aminoadipic semialdehyde, and plays an important role in the biosynthesis of 2-aminoadipic acid, a precursor of penicillin and other β-lactam antibiotics. The enzyme is related to ornithine-5-aminotransferases and to the lysine-6-aminotransferases encoded by the lat genes found in bacterial cephamycin gene clusters. Expression of oat1 is induced by lysine, ornithine and arginine, and repressed by ammonium ions. AreA-binding GATA and GATT sequences involved in regulation by ammonium, and an 8-bp direct repeat associated with arginine induction in Emericella (Aspergillus nidulans and Saccharomyces cerevisiae, were found in the oat1 promoter region. Deletion of the oat1 gene resulted in the loss of ω-aminotransferase activity. The null mutants were unable to grow on ornithine or arginine as sole nitrogen sources and showed reduced growth on lysine. Complementation of the null mutant with the oat1 gene restored normal levels of ω-aminotransferase activity and the ability to grow on ornithine, arginine and lysine. The role of the oat1 gene in the biosynthesis of 2-aminoadipic acid is discussed.

Keywords

Ω-Aminotransferase 2-Amino-adipic acid oat1 Penicillium chrysogenum Penicillin biosynthesis 

Notes

Acknowledgements

This work was supported by grants of the CICYT (BIO2000-1729-C02-02 and FIT-01000-2001-130). R.V. Ullán and F. Teijeira received fellowships from the Diputación de León and Junta de Castilla y León, respectively, L. Naranjo was granted a fellowship of the AECI Programme (Ministerio de Asuntos Exteriores, Madrid).

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Copyright information

© Springer-Verlag 2005

Authors and Affiliations

  • Leopoldo Naranjo
    • 1
    • 3
  • Mònica Lamas-Maceiras
    • 2
  • Ricardo V. Ullán
    • 1
  • Sonia Campoy
    • 1
  • Fernando Teijeira
    • 1
  • Javier Casqueiro
    • 1
    • 2
  • Juan F. Martín
    • 1
    • 2
    Email author
  1. 1.Instituto de Biotecnología de León (INBIOTEC)Parque Científico de LeónLeónSpain
  2. 2.Área de Microbiología, Fac. CC. Biológicas y AmbientalesUniversidad de LeónLeónSpain
  3. 3.Centro de BiotecnologíaInstituto de Estudios Avanzados (IDEA)CaracasVenezuela

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