The gene ncgl2918 encodes a novel maleylpyruvate isomerase that needs mycothiol as cofactor and links mycothiol biosynthesis and gentisate assimilation in Corynebacterium glutamicum

Feng J, Che YS, Milse J, Yin YJ, Liu L, Ruckert C, Shen XH, Qi SW, Kalinowski J, Liu SJ (2006)
JOURNAL OF BIOLOGICAL CHEMISTRY 281(16): 10778-10785.

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Data mining of the Corynebacterium glutamicum genome identified 4 genes analogous to the mshA, mshB, mshC, and mshD genes that are involved in biosynthesis of mycothiol in Mycobacterium tuberculosis and Mycobacterium smegmatis. Individual deletion of these genes was carried out in this study. Mutants mshC(-) and mshD(-) lost the ability to produce mycothiol, but mutant mshB(-) produced mycothiol as the wild type did. The phenotypes of mutants mshC(-) and mshD(-) were the same as the wild type when grown in LB or BHIS media, but mutants mshC(-) and mshD(-) were not able to grow in mineral medium with gentisate or 3-hydroxybenzoate as carbon sources. C. glutamicum assimilated gentisate and 3-hydroxybenzoate via a glutathione-independent gentisate pathway. In this study it was found that the maleylpyruvate isomerase, which catalyzes the conversion of maleylpyruvate into fumarylpyruvate in the glutathione-independent gentisate pathway, needed mycothiol as a cofactor. This mycothiol-dependent maleylpyruvate isomerase gene (ncgl2918) was cloned, actively expressed, and purified from Escherichia coli. The purified mycothiol-dependent isomerase is a monomer of 34 kDa. The apparent K-m and V-max values for maleylpyruvate were determined to be 148.4 +/- 11.9 mu M and 1520 +/- 57.4 mu mol/min/mg, respectively (mycothiol concentration, 2.5 mu M). Previous studies had shown that mycothiol played roles in detoxification of oxidative chemicals and antibiotics in streptomycetes and mycobacteria. To our knowledge, this is the first demonstration that mycothiol is essential for growth of C. glutamicum with gentisate or 3-hydroxybenzoate as carbon sources and the first characterization of a mycothiol-dependent maleylpyruvate isomerase.
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Feng J, Che YS, Milse J, et al. The gene ncgl2918 encodes a novel maleylpyruvate isomerase that needs mycothiol as cofactor and links mycothiol biosynthesis and gentisate assimilation in Corynebacterium glutamicum. JOURNAL OF BIOLOGICAL CHEMISTRY. 2006;281(16):10778-10785.
Feng, J., Che, Y. S., Milse, J., Yin, Y. J., Liu, L., Ruckert, C., Shen, X. H., et al. (2006). The gene ncgl2918 encodes a novel maleylpyruvate isomerase that needs mycothiol as cofactor and links mycothiol biosynthesis and gentisate assimilation in Corynebacterium glutamicum. JOURNAL OF BIOLOGICAL CHEMISTRY, 281(16), 10778-10785. doi:10.1074/jbc.M513192200
Feng, J., Che, Y. S., Milse, J., Yin, Y. J., Liu, L., Ruckert, C., Shen, X. H., Qi, S. W., Kalinowski, J., and Liu, S. J. (2006). The gene ncgl2918 encodes a novel maleylpyruvate isomerase that needs mycothiol as cofactor and links mycothiol biosynthesis and gentisate assimilation in Corynebacterium glutamicum. JOURNAL OF BIOLOGICAL CHEMISTRY 281, 10778-10785.
Feng, J., et al., 2006. The gene ncgl2918 encodes a novel maleylpyruvate isomerase that needs mycothiol as cofactor and links mycothiol biosynthesis and gentisate assimilation in Corynebacterium glutamicum. JOURNAL OF BIOLOGICAL CHEMISTRY, 281(16), p 10778-10785.
J. Feng, et al., “The gene ncgl2918 encodes a novel maleylpyruvate isomerase that needs mycothiol as cofactor and links mycothiol biosynthesis and gentisate assimilation in Corynebacterium glutamicum”, JOURNAL OF BIOLOGICAL CHEMISTRY, vol. 281, 2006, pp. 10778-10785.
Feng, J., Che, Y.S., Milse, J., Yin, Y.J., Liu, L., Ruckert, C., Shen, X.H., Qi, S.W., Kalinowski, J., Liu, S.J.: The gene ncgl2918 encodes a novel maleylpyruvate isomerase that needs mycothiol as cofactor and links mycothiol biosynthesis and gentisate assimilation in Corynebacterium glutamicum. JOURNAL OF BIOLOGICAL CHEMISTRY. 281, 10778-10785 (2006).
Feng, J, Che, YS, Milse, J, Yin, YJ, Liu, L, Ruckert, C, Shen, XH, Qi, SW, Kalinowski, Jörn, and Liu, SJ. “The gene ncgl2918 encodes a novel maleylpyruvate isomerase that needs mycothiol as cofactor and links mycothiol biosynthesis and gentisate assimilation in Corynebacterium glutamicum”. JOURNAL OF BIOLOGICAL CHEMISTRY 281.16 (2006): 10778-10785.
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