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- W2116414064 abstract "Gluconate:NADP 5-oxidoreductase (GNO) from the acetic acid bacterium Gluconobacter oxydans subsp. oxydans DSM3503 was purified to homogeneity. This enzyme is involved in the nonphosphorylative, ketogenic oxidation of glucose and oxidizes gluconate to 5-ketogluconate. GNO was localized in the cytoplasm, had an isoelectric point of 4.3, and showed an apparent molecular weight of 75,000. In sodium dodecyl sulfate gel electrophoresis, a single band appeared corresponding to a molecular weight of 33,000, which indicated that the enzyme was composed of two identical subunits. The pH optimum of gluconate oxidation was pH 10, and apparent Km values were 20.6 mM for the substrate gluconate and 73 microM for the cosubstrate NADP. The enzyme was almost inactive with NAD as a cofactor and was very specific for the substrates gluconate and 5-ketogluconate. D-Glucose, D-sorbitol, and D-mannitol were not oxidized, and 2-ketogluconate and L-sorbose were not reduced. Only D-fructose was accepted, with a rate that was 10% of the rate of 5-ketogluconate reduction. The gno gene encoding GNO was identified by hybridization with a gene probe complementary to the DNA sequence encoding the first 20 N-terminal amino acids of the enzyme. The gno gene was cloned on a 3.4-kb DNA fragment and expressed in Escherichia coli. Sequencing of the gene revealed an open reading frame of 771 bp, encoding a protein of 257 amino acids with a predicted relative molecular mass of 27.3 kDa. Plasmid-encoded gno was functionally expressed, with 6.04 U/mg of cell-free protein in E. coli and with 6.80 U/mg of cell-free protein in G. oxydans, which corresponded to 85-fold overexpression of the G. oxydans wild-type GNO activity. Multiple sequence alignments showed that GNO was affiliated with the group II alcohol dehydrogenases, or short-chain dehydrogenases, which display a typical pattern of six strictly conserved amino acid residues." @default.
- W2116414064 created "2016-06-24" @default.
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- W2116414064 date "1995-05-01" @default.
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- W2116414064 title "Biochemical characterization and sequence analysis of the gluconate:NADP 5-oxidoreductase gene from Gluconobacter oxydans" @default.
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- W2116414064 doi "https://doi.org/10.1128/jb.177.10.2637-2643.1995" @default.
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