King Gary M
Darling Marine Center, University of Maine, Walpole, Maine 04573, USA.
Appl Environ Microbiol. 2003 Dec;69(12):7266-72. doi: 10.1128/AEM.69.12.7266-7272.2003.
Liquid culture assays revealed a previously unreported capacity for Mycobacterium bovis BCG, M. gordonae, and M. marinum to oxidize CO and for M. smegmatis to consume molecular hydrogen. M. bovis BCG, M. gordonae, M. smegmatis, and M. tuberculosis H37Ra oxidized CO at environmentally relevant concentrations (<50 ppm); H2 oxidation by M. gordonae and M. smegmatis also occurred at environmentally relevant concentrations (<10 ppm). CO was not consumed by M. avium or M. microti, although the latter appeared to possess CO dehydrogenase (CODH) genes based on PCR results with primers designed for the CODH large subunit, coxL. M. smegmatis and M. gordonae oxidized CO under suboxic (10 and 1% atmospheric oxygen) and anoxic conditions in the presence of nitrate; no oxidation occurred under anoxic conditions without nitrate. Similar results were obtained for H2 oxidation by M. smegmatis. Phylogenetic analyses of coxL PCR products indicated that mycobacterial sequences form a subclade distinct from that of other bacterial coxL, with limited differentiation among fast- and slow-growing strains.
液体培养试验显示,牛分枝杆菌卡介苗、戈登分枝杆菌和海分枝杆菌具有此前未报道的氧化一氧化碳的能力,耻垢分枝杆菌具有消耗分子氢的能力。牛分枝杆菌卡介苗、戈登分枝杆菌、耻垢分枝杆菌和结核分枝杆菌H37Ra在环境相关浓度(<50 ppm)下氧化一氧化碳;戈登分枝杆菌和耻垢分枝杆菌在环境相关浓度(<10 ppm)下也能氧化氢气。鸟分枝杆菌或田鼠分枝杆菌不消耗一氧化碳,尽管基于用针对一氧化碳脱氢酶(CODH)大亚基coxL设计的引物进行的PCR结果,后者似乎拥有CODH基因。耻垢分枝杆菌和戈登分枝杆菌在亚oxic(10%和1%大气氧)和缺氧条件下,在硝酸盐存在时氧化一氧化碳;在没有硝酸盐的缺氧条件下不发生氧化。耻垢分枝杆菌氧化氢气也得到了类似结果。coxL PCR产物的系统发育分析表明,分枝杆菌序列形成了一个与其他细菌coxL不同的亚分支,快速生长和缓慢生长菌株之间的分化有限。