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pubmed-article:15765053pubmed:abstractTextA soluble Cr(VI) reductase was purified from the cytoplasm of Escherichia coli ATCC 33456. The molecular mass was estimated to be 84 and 42 kDa by gel filtration and SDS-polyacrylamide gel electrophoresis, respectively, indicating a dimeric structure. The pI was 4.66, and optimal enzyme activity was obtained at pH 6.5 and 37 degrees C. The most stable condition existed at pH 7.0. The purified enzyme used both NADPH and NADH as electron donors for Cr(VI) reduction, while NADPH was the better, conferring 61%; higher activity than NADH. The Km values for NADPH and NADH were determined to be 47.5 and 17.2 micromol, and the Vmax values 322.2 and 130.7 micromol Cr(VI) min(-1)mg(-1) protein, respectively. The activity was strongly inhibited by N-ethylmalemide, Ag2+, Cd2+, Hg2+, and Zn2+. The antibody against the enzyme showed no immunological cross reaction with those of other Cr(VI) reducing strains.lld:pubmed
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pubmed-article:15765053pubmed:dateRevised2006-11-15lld:pubmed
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pubmed-article:15765053pubmed:year2005lld:pubmed
pubmed-article:15765053pubmed:articleTitlePurification and characterization of NADPH-dependent Cr(VI) reductase from Escherichia coli ATCC 33456.lld:pubmed
pubmed-article:15765053pubmed:affiliationDivision of Bioscience and Bioinformatics, Myongji University, Yongin, 449-728, Republic of Korea.lld:pubmed
pubmed-article:15765053pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:15765053pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed