Allosteric nucleotide-binding site in the mitochondrial NADH:ubiquinone oxidoreductase (respiratory complex I).

Allosteric nucleotide-binding site in the mitochondrial NADH:ubiquinone oxidoreductase (respiratory complex I).
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DOI:
10.1016/j.febslet.2011.05.039
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发表时间:
2011-07-21
期刊:
影响因子:
3.5
通讯作者:
Vinogradov AD
Vinogradov AD
中科院分区:
生物学3区
文献类型:
--
作者:
Grivennikova VG;Gladyshev GV;Vinogradov AD

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鱼藤酮不敏感的NADH:六铵盐III(HAR)氧化还原酶由牛心和解脂耶罗维菌亚线粒体颗粒或纯化的牛复合体I催化,受ATP和其他嘌呤核苷酸的刺激。脱氮副球藻质膜中哺乳动物复合体I(FP)和原核复合体I的同系物NDH-1的可溶性部分缺乏三磷酸腺苷的刺激作用。这种刺激表现为NADH和HAR的表观Km值降低。因此,真核复合体I的“辅助”亚基带有变构的ATP结合位点。
The rotenone-insensitive NADH:hexaammineruthenium III (HAR) oxidoreductase reactions catalyzed by bovine heart and Yarrowia lipolytica submitochondrial particles or purified bovine complex I are stimulated by ATP and other purine nucleotides. The soluble fraction of mammalian complex I (FP) and prokaryotic complex I homolog NDH-1 in Paracoccus denitrificans plasma membrane lack stimulation of their activities by ATP. The stimulation appears as a decrease in apparent Km values for NADH and HAR. Thus, the “accessory” subunits of eukaryotic complex I bear an allosteric ATP-binding site.
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