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Properties and primary structure of a thermostable L-malate dehydrogenase from Archaeoglobus fulgidus.

Arch. Microbiol.1997 Jul;168(1):59-67. doi:10.1007/s002030050470
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摘要


A thermostable l-malate dehydrogenase from the hyperthermophilic sulfate-reducing archaeon Archaeoglobus fulgidus was isolated and characterized, and its gene was cloned and sequenced. The enzyme is a homodimer with a molecular mass of 70 kDa and catalyzes preferentially the reduction of oxaloacetic acid with NADH. A. fulgidus L-malate dehydrogenase was stable for 5 h at 90 degrees C, and the half-life at 101 degrees C was 80 min. Thus, A. fulgidus L-malate dehydrogenase is the most thermostable L-malate dehydrogenase characterized to date. Addition of K2HPO4 (1 M) increased the thermal stability by 40%. The primary structure shows a high similarity to L-lactate dehydrogenase from Thermotoga maritima and gram-positive bacteria, and to L-malate dehydrogenase from the archaeon Haloarcula marismortui and other L-lactate-dehydrogenase-like L-malate dehydrogenases.

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