Anammox organism KSU-1 expresses a NirK-type copper-containing nitrite reductase instead of a NirS-type with cytochrome cd₁

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• 作者：Daisuke Hira^a ; ^{hira@life.sojo-u.ac.jp} ; Hidehiro Toh^b ; Catharina T. Migita^c ; Hiroki Okubo^a ; Takashi Nishiyama^a ; Masahira Hattori^d ; Kenji Furukawa^e ; Takao Fujii^a
• 关键词：NIR ; nitrite reductase ; cd1NIR ; cytochrome cd1 NIR ; CuNIR ; copper-containing NIR ; EPR ; electron paramagnetic resonance ; ET ; electron transfer
• 刊名：FEBS Letters
• 出版年：2012
• 期刊代码：70_00145793
• 类别：bio
• 出版时间：4 June, 2012
• 卷：586
• 期：11
• 页码：1658-1663
• 文件大小：987 K

摘要

Anaerobic ammonium oxidation (anammox) and denitrification are two distinct microbial reactions relevant to the global nitrogen cycle. The proposed initial step of the anammox reactions, reduction of nitrite to nitric oxide, has been postulated to be identical to that in denitrification catalyzed by the dissimilatory nitrite reductase of the cytochrome cd₁-type. Here, we characterized the copper-containing nitrite reductase homolog encoded by nirK detected in the genome of an anammox bacterium strain KSU-1. We hypothesize that this NirK-type nitrite reductase, rather than a nitrite reductase of the cytochrome cd₁-type (NirS), is likely to catalyze nitrite reduction in anammox organism KSU-1.