ArticleExtremophiles : life under extreme conditions2018
Pcal_0632, a phosphorylating glyceraldehyde-3-phosphate dehydrogenase from Pyrobaculum calidifontis.
Article in Extremophiles : life under extreme conditions, 2018. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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6 authors at 4 institutions in 3 countries.
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Abstract
Genome sequence of the hyperthermophilic archaeon Pyrobaculum calidifontis contains an open reading frame, Pcal_0632, annotated as glyceraldehyde-3-phosphate dehydrogenase, which is partially overlapped with phosphoglycerate kinase. In the phylogenetic tree, Pcal_0632 clustered with phosphorylating glyceraldehyde-3-phosphate dehydrogenases characterized from hyperthermophilic archaea and exhibited highest identity of 54% with glyceraldehyde-3-phosphate dehydrogenase from Sulfolobus tokodaii. To examine biochemical function of the protein, Pcal_0632 gene was expressed in Escherichia coli and the gene product was purified. The recombinant enzyme catalyzed the conversion of glyceraldehyde 3-phosphate and inorganic phosphate into 1,3-bisphosphoglycerate utilizing both NAD and NADP as cofactor with a marked preference for NADP. The enzyme was highly stable against temperature and denaturants. Half-life of the enzyme was 60 min at 100 °C. It retained more than 60% of its activity even after an incubation of 72 h at room temperature in the presence of 6 M urea. High thermostability and resistance against denaturants make Pcal_0632 a novel glyceraldehyde-3-phosphate dehydrogenase.
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