Cloning of formate dehydrogenase gene from a methanol-utilizing bacterium Mycobacterium vaccae N10

Applied Microbiology and Biotechnology
A G GalkinK Soda

Abstract

The gene of NAD(+)-dependent formate dehydrogenase (FDH) from Mycobacterium vaccae N10 was cloned into Escherichia coli by hybridization with digoxigenin-labeled DNA probes, which were prepared by amplification of the chromosomal DNA from the bacterium by the polymerase chain reaction with degenerate primers. The primers were designed on the basis of the most conserved parts of known sequences of FDH from different organisms. An open-reading frame of 1200 bp exhibited extremely high sequence similarity to the FDH gene of Pseudomonas sp. 101. The deduced amino acid sequence of FDH from Mycobacterium vaccae N10 (McFDH) was identical to that of Pseudomonas sp. 101 (PsFDH) except for two amino acid residues: isoleucine-35 (threonine in PsFDH) and glutamate-61 (lysine in PsFDH). The physicochemical properties of both enzymes appeared to be closely similar to each other, but the thermostability of McFDH was a little lower than that of PsFDH. To examine the role of the two amino acid residues in the thermostability of the enzymes, glutamate-61 of McFDH was replaced by glutaminyl, prolyl and lysyl residues by site-directed mutagenesis. All the mutant enzymes showed higher thermostability than the wild-type McFDH. The negative charge of...Continue Reading

Citations

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