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Functional Identification of Novel Genes Involved in the Glutathione-Independent Gentisate Pathway in Corynebacterium glutamicum.
- Source :
-
Applied & Environmental Microbiology . Jul2005, Vol. 71 Issue 7, p3442-3452. 11p. - Publication Year :
- 2005
-
Abstract
- Corynebacterium glutamicum used gentisate and 3-hydroxybenzoate as its sole carbon and energy source for growth. By genome-wide data mining, a gene cluster designated ncg12918-ncg12923 was proposed to encode putative proteins involved in gentisate/3-hydroxybenzoate pathway. Genes encoding gentisate l,2-dioxygenase (ncg12920) and fumarylpyruvate hydrolase (ncg12919) were identified by cloning and expression of each gene in Escherichki coli. The gene of ncg12918 encoding a hypothetical protein (Ncg12918) was proved to be essential for gentisate-3-hydroxybenzoate assimilation. Mutant strain RES167Δncg12918 lost the ability to grow on gentisate or 3-hydroxybenzoate, but this ability could be restored in C. glutamicum upon the complementation with pXMJ19-ncg12919. Cloning and expression of this ncg12918 gene in E. coli showed that Ncg12918 is a glutathione-independent maleylpyruvate isomerase. Upstream of ncg12920, the genes ncg12921-ncg12923 were located, which were essential for gentisate and/or 3-hydroxybenzoate catabolism. The Ncg12921 was able to up-regulate gentisate 1,2-dioxygenase, maleylpyruvate isomerase, and fumarylpyruvate hydrolase activities. The genes ncg12922 and ncg12923 were deduced to encode a gentisate transporter protein and a 3-hydroxy- benzoate hydroxylase, respectively, and were essential for gentisate or 3-hydroxybenzoate assimilation. Based on the results obtained in this study, a GSII-independent gentis ate pathway was proposed, and genes involved in this pathway were identified. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00992240
- Volume :
- 71
- Issue :
- 7
- Database :
- Academic Search Index
- Journal :
- Applied & Environmental Microbiology
- Publication Type :
- Academic Journal
- Accession number :
- 17745479
- Full Text :
- https://doi.org/10.1128/AEM.71.7.3442-3452.2005