Molecular and Phylogenetic Characterization of Isopropylmalate Dehydrogenase of a Thermoacidophilic Archaeon, Sulfolobus Sp. Strain 7

Overview

Journal J Bacteriol

Publisher American Society for Microbiology

Specialty Microbiology

Date 1997 Feb 1

PMID 9023199

Citations 7

Authors

T Suzuki

Y Inoki

A Yamagishi

T Iwasaki

T Wakagi

T Oshima

Affiliations

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Abstract

The archaeal leuB gene encoding isopropylmalate dehydrogenase of Sulfolobus sp. strain 7 was cloned, sequenced, and expressed in Escherichia coli. The recombinant Sulfolobus sp. enzyme was extremely stable to heat. The substrate and coenzyme specificities of the archaeal enzyme resembled those of the bacterial counterparts. Sedimentation equilibrium analysis supported an earlier proposal that the archaeal enzyme is homotetrameric, although the corresponding enzymes studied so far have been reported to be dimeric. Phylogenetic analyses suggested that the archaeal enzyme is homologous to mitochondrial NAD-dependent isocitrate dehydrogenases (which are tetrameric or octameric) as well as to isopropylmalate dehydrogenases from other sources. These results suggested that the present enzyme is the most primitive among isopropylmalate dehydrogenases belonging in the decarboxylating dehydrogenase family.

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