Rodrigues João V, Abreu Isabel A, Saraiva Lígia M, Teixeira Miguel
Instituto de Tecnologia Química e Biológica, Universidade Nova de Lisboa, Av. da República (EAN) Apt 127, 2781-901 Oeiras, Portugal.
Biochem Biophys Res Commun. 2005 Apr 22;329(4):1300-5. doi: 10.1016/j.bbrc.2005.02.114.
Archaeoglobus fulgidus neelaredoxin (Nlr) is an electron donor:superoxide oxidoreductase. The reaction of superoxide with reduced Nlr is almost diffusion-limited, but the overall efficiency for detoxifying superoxide in vivo depends on the rate of reduction of Nlr by electron donors. Here, we report the purification and characterization of the two type I rubredoxins from A. fulgidus (AF0880 and AF1349) and show that they act as efficient electron donors for neelaredoxin, in vitro, with a second-order rate constant of 10(7)M(-1)s(-1) at 10 degrees C and pH 7.2.
嗜热栖热放线菌的嗜热栖热放线菌尼尔雷多oxin(Nlr)是一种电子供体:超氧化物氧化还原酶。超氧化物与还原型Nlr的反应几乎受扩散限制,但体内超氧化物解毒的整体效率取决于电子供体对Nlr的还原速率。在这里,我们报告了嗜热栖热放线菌两种I型红素氧还蛋白(AF0880和AF1349)的纯化和特性,并表明它们在体外作为尼尔雷多oxin的有效电子供体,在10℃和pH 7.2下二级速率常数为10(7)M(-1)s(-1)。