@article{oai:kanazawa-u.repo.nii.ac.jp:00010195, author = {田岡 , 東 and 金森, 正明 and 福森, 義宏 and Taoka, Azuma and Yoshimatsu, Katsuhiko and Kanemori, Masaaki and Fukumori, Yoshihiro}, issue = {3}, journal = {Canadian Journal of Microbiology}, month = {Jan}, note = {We purified the nitrate reductase from the soluble fraction of Magnetospirillum magnetotacticum MS-1. The enzyme was composed of 86- and 17-kDa subunits and contained molybdenum, non-heme iron, and heme c. These properties are very similar to those of the periplasmic nitrate reductase found in Paracoccus pantotrophus. The M. magnetotacticum nap locus was clustered in seven open reading frames, napFDAGHBC. The phylogenetic analyses of NapA, NapB, and NapC suggested a close relationship between M. magnetotacticum nap genes and Escherichia coli nap genes, which is not consistent with the 16S rDNA data. This is the first finding that the ホア subclass of Proteobacteria possesses a napFDAGHBC-type nap gene cluster. The nap gene cluster had putative fumarate and nitrate reduction regulatory protein (Fnr) and NarL protein binding sites. Furthermore, we investigated the effect of molybdate deficiency in medium on the total iron content of the magnetosome fraction and discussed the physiological function of nitrate reductase in relation to the magnetite synthesis in M. magnetotacticum., ベンチャー・ビジネス・ラボラトリー, 金沢大学大学院自然科学研究科動態生理学}, pages = {197--206}, title = {Nitrate reductase from the magnetotactic bacterium Magnetospirillum magnetotacticum MS-1: Purification and sequence analyses}, volume = {49}, year = {2003} }