期刊
BIOCHEMICAL JOURNAL
卷 369, 期 -, 页码 185-189出版社
PORTLAND PRESS
DOI: 10.1042/BJ20021193
关键词
haem-containing enzyme; nitrate reductase; nitrite reductase; vanadium-containing enzyme
A novel molybdenum-free nitrate reductase was isolated from the obligate chemolithoautotrophic and facultative anaerobic, (halo)alkaliphilic sulphur-oxidizing bacterium Thioalkalivibrio nitratireducens strain ALEN 2. The enzyme was found to contain vanadium and haem c as cofactors. Its native molecular mass was determined as 195 kDa, and the enzyme consists of four identical subunits with apparent molecular masses of 57 kDa. Apart from nitrate, the enzyme can utilize nitrite, chlorate, bromate, selenate and sulphite as electron acceptors. Moreover, it also has a haloperoxidase activity.
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