Cloning, sequencing, and expression of a gene encoding the monomeric isocitrate dehydrogenase of the nitrogen-fixing bacterium, Azotobacter vinelandii.

作者: Takehiko SAHARA , Yasuhiro TAKADA , Yoji TAKEUCHI , Naoto YAMAOKA , Noriyuki FUKUNAGA

DOI: 10.1271/BBB.66.489

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摘要: Isocitrate dehydrogenase (IDH: EC 1.1.1.42) of Azotobacter vinelandii was purified to an electrophoretically homogeneous state, and a gene (icd) encoding this enzyme cloned sequenced. The N-terminal amino acid sequence the consistent with that deduced from nucleotide icd gene. showed high identity (62–66%) those other bacterial monomeric IDHs. Expression in Escherichia coli examined by measuring activity mRNA level. Primer extension analyses revealed two species mRNAs different lengths 5′-untranslated regions (TS-1 TS-2) were present, which 5′-terminals TS-2 sites) cytosines located at 244 bp 101 upstream translational initiation codon, respectively. Conserved promoter elements present —35 —10 TS-1 site, whereas no such common motif found region site. De...

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