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pubmed-article:17707766pubmed:abstractTextCO dehydrogenase (CO-DH) catalyzes the oxidation of CO to CO(2) in carboxydobacteria. Cell-free extracts prepared from several mycobacteria, including Mycobacterium tuberculosis H37Ra, showed NO dehydrogenase (NO-DH) activity in a reaction mixture containing sodium nitroprusside (SNP) as the source of NO. The association of the NO-DH activity with CO-DH was revealed by activity staining and confirmed by enzyme assay with purified CO-DH from Mycobacterium sp. strain JC1, a carboxydotrophic mycobacterium. SNP stimulated the production of CO-DH with a coincidental increase in NO-DH activity in the bacterium, further supporting this association and implying the existence of a possible SNP-induced CO-DH gene expression. The addition of purified CO-DH to cultures of Escherichia coli revealed that the enzyme protected E. coli from SNP-induced killing in a dose-dependant way. The present results indicate that mycobacterial CO-DH also acts as a NO-DH, which may function in the protection of mycobacterial pathogens from nitrosative stress during infection.lld:pubmed
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pubmed-article:17707766pubmed:articleTitleCarbon monoxide dehydrogenase in mycobacteria possesses a nitric oxide dehydrogenase activity.lld:pubmed
pubmed-article:17707766pubmed:affiliationDepartment of Biology, Yonsei University, Seoul 120-749, Republic of Korea.lld:pubmed
pubmed-article:17707766pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:17707766pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed
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