Genome-based analysis of biosynthetic aminotransferase genes of Corynebacterium glutamicum

McHardy AC, Tauch A, Rückert C, Pühler A, Kalinowski J (2003)
J Biotechnol 104(1-3): 229-240.

Zeitschriftenaufsatz | Veröffentlicht | Englisch
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Abstract / Bemerkung
Due to broad and overlapping substrate specificities, aminotransferases remain the last uncharacterized enzymes from most amino acid biosynthetic pathways in Corynebacterium glutamicum. We report here a complete description of all aminotransferases participating in the biosynthesis of the branched-chain amino acids and phenylalanine in C glutamicum. We used methods of profile analysis on the newly available genome sequence to systematically search for and characterize members of the four known aminotransferase classes. This led to the discovery of sixteen new, potential aminotransferase encoding genes in the C glutamicum genome, eleven of which were subsequently characterized experimentally with respect to their participation in different amino acid biosynthetic pathways. Disruption by insertion mutagenesis of ilvE, encoding a branched-chain amino acid aminotransferase, confirmed its function in leucine and isoleucine biosynthesis. Two double mutants lacking both ilvE and genes classified as class I aminotransferases exhibited additional auxotrophic requirements for valine and phenylalanine, respectively. In C glutamicum the branched-chain amino acid aminotransferase thus participates in four amino acid biosynthetic pathways, for which in case of valine and phenylalanine biosynthesis two additional enzymes with overlapping substrate specificity exist. The novel protein with aminotransferase activity in valine biosynthesis belongs to the very recently described MocR subfamily of GntR-type helix-turn-helix transcriptional regulators, is located upstream of a potential operon of a newly described pyridoxine biosynthetic pathway and when disrupted, gives rise to a pyridoxine auxotrophy. The theoretical and experimental data we present should further provide a solid platform for ongoing research and understanding of the network of aminotransferases which participate in amino acid biosynthesis in C glutamicum. (C) 2003 Elsevier B.V. All rights reserved.
acids; Corynebacterium glutamicum; branched-chain amino; GntR-type transcriptional regulator; HMM-based profile analysis; aminotransferase
J Biotechnol
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McHardy AC, Tauch A, Rückert C, Pühler A, Kalinowski J. Genome-based analysis of biosynthetic aminotransferase genes of Corynebacterium glutamicum. J Biotechnol. 2003;104(1-3):229-240.
McHardy, A. C., Tauch, A., Rückert, C., Pühler, A., & Kalinowski, J. (2003). Genome-based analysis of biosynthetic aminotransferase genes of Corynebacterium glutamicum. J Biotechnol, 104(1-3), 229-240.
McHardy, AC, Tauch, Andreas, Rückert, Christian, Pühler, Alfred, and Kalinowski, Jörn. 2003. “Genome-based analysis of biosynthetic aminotransferase genes of Corynebacterium glutamicum”. J Biotechnol 104 (1-3): 229-240.
McHardy, A. C., Tauch, A., Rückert, C., Pühler, A., and Kalinowski, J. (2003). Genome-based analysis of biosynthetic aminotransferase genes of Corynebacterium glutamicum. J Biotechnol 104, 229-240.
McHardy, A.C., et al., 2003. Genome-based analysis of biosynthetic aminotransferase genes of Corynebacterium glutamicum. J Biotechnol, 104(1-3), p 229-240.
A.C. McHardy, et al., “Genome-based analysis of biosynthetic aminotransferase genes of Corynebacterium glutamicum”, J Biotechnol, vol. 104, 2003, pp. 229-240.
McHardy, A.C., Tauch, A., Rückert, C., Pühler, A., Kalinowski, J.: Genome-based analysis of biosynthetic aminotransferase genes of Corynebacterium glutamicum. J Biotechnol. 104, 229-240 (2003).
McHardy, AC, Tauch, Andreas, Rückert, Christian, Pühler, Alfred, and Kalinowski, Jörn. “Genome-based analysis of biosynthetic aminotransferase genes of Corynebacterium glutamicum”. J Biotechnol 104.1-3 (2003): 229-240.

18 Zitationen in Europe PMC

Daten bereitgestellt von Europe PubMed Central.

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