ジャーナル: Sci Adv / 年: 2019 タイトル: A 192-heme electron transfer network in the hydrazine dehydrogenase complex. 著者: M Akram / A Dietl / U Mersdorf / S Prinz / W Maalcke / J Keltjens / C Ferousi / N M de Almeida / J Reimann / B Kartal / M S M Jetten / K Parey / T R M Barends / 要旨: Anaerobic ammonium oxidation (anammox) is a major process in the biogeochemical nitrogen cycle in which nitrite and ammonium are converted to dinitrogen gas and water through the highly reactive ...Anaerobic ammonium oxidation (anammox) is a major process in the biogeochemical nitrogen cycle in which nitrite and ammonium are converted to dinitrogen gas and water through the highly reactive intermediate hydrazine. So far, it is unknown how anammox organisms convert the toxic hydrazine into nitrogen and harvest the extremely low potential electrons (-750 mV) released in this process. We report the crystal structure and cryo electron microscopy structures of the responsible enzyme, hydrazine dehydrogenase, which is a 1.7 MDa multiprotein complex containing an extended electron transfer network of 192 heme groups spanning the entire complex. This unique molecular arrangement suggests a way in which the protein stores and releases the electrons obtained from hydrazine conversion, the final step in the globally important anammox process.
温度: 293 K / 手法: 蒸気拡散法, ハンギングドロップ法 詳細: 1+1 ul hanging drops against a reservoir solution containing 8-9% (w/v) polyethylene glycol 4000, 0.25 M (NH4)2SO4.
解像度: 2.8→93.71 Å / Cor.coef. Fo:Fc: 0.923 / Cor.coef. Fo:Fc free: 0.915 / SU B: 19.245 / SU ML: 0.338 / 交差検証法: THROUGHOUT / ESU R Free: 0.352 / 詳細: HYDROGENS HAVE BEEN USED IF PRESENT IN THE INPUT