Identification of a suppressor gene for the arginine-auxotrophic argJ mutation in Corynebacterium glutamicum

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Abstract

We recently proposed a metabolic engineering strategy for l-ornithine production based on the hypothesis that an increased intracellular supply of N-acetylglutamate may further enhance l-ornithine production in a well-defined recombinant strain of Corynebacterium glutamicum. In this work, an argJ-deficient arginine auxotrophic mutant of C. glutamicum is suppressed by a different locus of C. glutamicum ATCC13032. Overexpression of the NCgl1469 open reading frame (ORF), exhibiting N-acetylglutamate synthase (NAGS) activity, was able to complement the C. glutamicum arginine-auxotrophic argJ strain and showed increased NAGS activity from 0.03 to 0.17 units mg-1 protein. Additionally, overexpression of the NCgl1469 ORF resulted in a 39% increase in excreted l-ornithine. These results indicate that the intracellular supply of N-acetylglutamate is a rate-limiting step during l-ornithine production in C. glutamicum. © 2010 Society for Industrial Microbiology.

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Hwang, G. H., & Cho, J. Y. (2010). Identification of a suppressor gene for the arginine-auxotrophic argJ mutation in Corynebacterium glutamicum. Journal of Industrial Microbiology and Biotechnology, 37(11), 1131–1136. https://doi.org/10.1007/s10295-010-0760-3

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