翻訳と辞書 Words near each other ・ Nickel Plate 587 ・ Nickel Plate 759 ・ Nickel Plate 765 ・ Nickel Plate 779 ・ Nickel Plate Depot (Chicago) ・ Nickel Plate Limited ・ Nickel Plate Provincial Park ・ Nickel Plate Road 190 ・ Nickel Plate Trail ・ Nickel plating ・ Nickel Project ・ Nickel Queen ・ Nickel selenide ・ Nickel silver ・ Nickel sulfide ・ Nickel superoxide dismutase ・ Nickel tetracarbonyl ・ Nickel Theatre ・ Nickel titanium ・ Nickel titanium rotary file ・ Nickel Trophy ・ Nickel(II) acetate ・ Nickel(II) acetylacetonate ・ Nickel(II) bromide ・ Nickel(II) carbonate ・ Nickel(II) chloride ・ Nickel(II) fluoride ・ Nickel(II) hydroxide ・ Nickel(II) iodide ・ Nickel(II) nitrate Dictionary Lists mini英和辞書 mini和英辞書 Webster 1913 Latin-English FOLDOC Wikipedia English ウィキペディア

翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Nickel superoxide dismutase ： ウィキペディア英語版 Nickel superoxide dismutase Nickel superoxide dismutase (Ni-SOD) is a metalloenzyme that, like the other superoxide dismutases, protects cells from oxidative damage by catalyzing the disproportionation of the cytotoxic superoxide radical (O2-) to hydrogen peroxide and molecular oxygen. Superoxide is a reactive oxygen species that is produced in large amounts during photosynthesis and aerobic cellular respiration.〔 The equation for the disproportionation of superoxide is shown below: $\backslash rm\; 2O\_2^-\; +\; 2H^+\; \backslash xrightarrow\; H\_2O\_2\; +\; O\_2$ Ni-SOD was first isolated in 1996 from ''Streptomyces'' bacteria and is primarily found in prokaryotic organisms.〔 It has since been observed in cyanobacteria and a number of other aquatic microbes.〔 Ni-SOD is homohexameric, meaning that it has six identical subunits.〔 Each subunit has a single nickel containing active site.〔 The disproportionation mechanism involves a reduction-oxidation cycle where a single electron transfer is catalyzed by the Ni2+/Ni3+ redox couple.〔〔 Ni-SOD catalyzes close to the barrier of diffusion, making it an incredibly efficient enzyme.〔 ==Structure== Ni-SOD is a globular protein and is shaped like a hollow sphere. It is homohexameric, meaning that it is made up of six identical subunits. Each subunit is a bundle of four right-handed α-helixes and has a molecular mass of 13.4 kDa (117 amino acids). The subunits align to give Ni-SOD a three-fold axis of symmetry.〔 There are six nickel cofactors in total (one for each subunit). The subunits also have a hydrophobic core, which helps drive protein folding. The core is made up of 17 aliphatic amino acids. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Nickel superoxide dismutase」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.