硫化物
化学
富马酸还原酶
生物化学
氰化物
大肠杆菌
细菌
血红素
脱氢酶
酶
生物
琥珀酸脱氢酶
无机化学
有机化学
基因
血红素
遗传学
作者
Hiroomi Shibata,Kuniyuki SuzukiK. Suzuki,Shigeki Kobayashi
出处
期刊:Canadian Journal of Microbiology
[Canadian Science Publishing]
日期:2007-09-01
卷期号:53 (9): 1091-1100
被引量:17
摘要
The gene-encoding HMT2-like sulfide dehydrogenase from Bacillus stearothermophilus JCM2501 was amplified and expressed in Escherichia coli and the enzymatic features were examined. The enzyme was detected mainly in the membrane fraction. It catalyzed the sulfide-dependent menaquinone (MK) reduction showing special enzymatic features distinct from other sulfide–quinone oxidoreductases (SQRs) from autotrophic bacteria. The purified protein from E. coli brought about the sulfide-dependent 2,3-dimethyl-1,4-naphthoquinone (DMN) reduction in vitro. The reduction was accelerated in the presence of either cyanide or 2-mercaptoethanol and phospholipids. The high reduction was followed by a change in K m values for sulfide and DMN. The purified enzyme utilized MK as an electron acceptor in the membrane fraction from E. coli. Under anaerobic conditions, sulfide was oxidized with reduction of fumarate or nitrate via the MK pool. The dehydrogenase was different from SQR in autotrophic bacteria in terms of the low affinity for sulfide and the activity enhancement in the presence of cyanide or 2-mercaptoethanol. The sulfide oxidation via MK in the cellular membrane of Gram-positive bacteria was certified.
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