The Respiratory Complex I (NDH I) from Klebsiella pneumoniae, a Sodium Pump*
The Respiratory Complex I (NDH I) from Klebsiella pneumoniae, a Sodium Pump*
复制标题
肺炎克雷伯菌的呼吸复合物 I (NDH I),钠泵*
DOI:
10.1074/jbc.m204860200
复制
发表时间:
2002
期刊:
影响因子:
--
通讯作者:
J. Steuber
中科院分区:
文献类型:
--
作者:
A. Gemperli;P. Dimroth;J. Steuber
The electrogenic NADH:Q oxidoreductase from the enterobacterium Klebsiella pneumoniae transports Na+ ions. The complex was purified with an increase of the specific Na+ transport activity from 0.2 μmol min−1 mg−1 in native membrane vesicles to 4.7 μmol min−1 mg−1 in reconstituted enzyme specimens. The subunit pattern resembled that of complex I fromEscherichia coli, and two prominent polypeptides were identified as the NuoF and NuoG subunits of complex I. During purification the typical cofactors of complex I were enriched to yield ∼17 nmol mg−1 iron, 24 nmol mg−1acid-labile sulfide, and 0.79 nmol mg−1 FMN in the purified sample. The enzyme contained ∼1.2 nmol mg−1 Q6 and 1.5 nmol mg−1 Q8. The reduction of ubiquinone by NADH was Na+-dependent, which indicates coupling of the chemical and the vectorial reaction of the pump. The Na+ activation profile corresponded to the Hill equation with a Hill coefficient KH(Na+) = 1.96 and with a half-maximal saturation at 0.33 mm Na+. The reconstituted complex I from Klebsiella pneumoniae catalyzed deamino-NADH oxidation, Q1 reduction, and Na+ translocation with specific activities of 2.6 units mg−1, 2.4 units mg−1, and 4.7 units mg−1, respectively, which indicate a Na+/electron stoichiometry of one.
登录
查看更多内容
DOI:
10.1111/j.1432-1033.1994.tb19985.x
发表时间:
1994-01-15
期刊:
EUROPEAN JOURNAL OF BIOCHEMISTRY
影响因子:
--
作者:
FRIEDRICH, T;VANHEEK, P;WEISS, H
通讯作者:
WEISS, H
DOI:
10.1016/s0005-2728(98)00023-1
发表时间:
1998-05
期刊:
Biochimica et biophysica acta
影响因子:
--
作者:
Takao Yagi;Takahiro Yano;Salvatore Di Bernardo;A. Matsuno‐Yagi
通讯作者:
Takao Yagi;Takahiro Yano;Salvatore Di Bernardo;A. Matsuno‐Yagi
DOI:
10.1073/pnas.96.7.4149
发表时间:
1999-03
影响因子:
11.1
作者:
F. Schuler;T. Yano;S. Bernardo;T. Yagi;V. Yankovskaya;T. Singer;J. Casida
通讯作者:
F. Schuler;T. Yano;S. Bernardo;T. Yagi;V. Yankovskaya;T. Singer;J. Casida
DOI:
10.1016/s0005-2728(98)00026-7
发表时间:
1998
期刊:
Biochimica et biophysica acta
影响因子:
--
作者:
Vinogradov,AD
通讯作者:
Vinogradov,AD
DOI:
10.1016/s0005-2728(98)00156-x
发表时间:
1999
期刊:
Biochimica et biophysica acta
影响因子:
--
作者:
Ushakova,AV;Grivennikova,VG;Ohnishi,T;Vinogradov,AD
通讯作者:
Vinogradov,AD