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. 1992 Jul;174(14):4606–4613. doi: 10.1128/jb.174.14.4606-4613.1992

Characterization of the Streptomyces clavuligerus argC gene encoding N-acetylglutamyl-phosphate reductase: expression in Streptomyces lividans and effect on clavulanic acid production.

M Ludovice 1, J F Martin 1, P Carrachas 1, P Liras 1
PMCID: PMC206255  PMID: 1339424

Abstract

The argC gene of Streptomyces clavuligerus encoding N-acetylglutamyl-phosphate reductase (AGPR) has been cloned by complementation of argC mutants Streptomyces lividans 1674 and Escherichia coli XC33. The gene is contained in an open reading frame of 1,023 nucleotides which encodes a protein of 340 amino acids with a deduced molecular mass of 35,224 Da. The argC gene is linked to argE, as shown by complementation of argE mutants of E. coli. Expression of argC from cloned DNA fragments carrying the gene leads to high levels of AGPR in wild-type S. lividans and in the argC mutant S. lividans 1674. Formation of AGPR is repressed by addition of arginine to the culture medium. The protein encoded by the argC gene is very similar to the AGPRs of Streptomyces coelicolor, Bacillus subtilis, and E. coli and, to a lesser degree, to the homologous enzymes of Saccharomyces cerevisiae and Anabaena spp. A conserved PGCYPT domain present in all the AGPR sequences suggests that this may be the active center of the protein. Transformation of S. clavuligerus 328, an argC auxotroph deficient in clavulanic acid biosynthesis, with plasmid pULML30, carrying the cloned argC gene, restored both prototrophy and antibiotic production.

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Selected References

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