Spectral deconvolution of redox species in the crotonyl-CoA-dependent NADH:ferredoxin oxidoreductase from Megasphaera elsdenii. A flavin-dependent bifurcating enzyme.

Spectral deconvolution of redox species in the crotonyl-CoA-dependent NADH:ferredoxin oxidoreductase from Megasphaera elsdenii. A flavin-dependent bifurcating enzyme.
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氧化还原物种的光谱去卷积巴豆酰辅酶A依赖的NADH:铁氧还蛋白氧化还原酶从埃氏巨球菌。一种黄素依赖性分叉酶。

DOI:
10.1016/j.abb.2021.108793
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发表时间:
2021-04-15
影响因子:
3.9
通讯作者:
Hille R
Hille R
中科院分区:
生物学3区
文献类型:
--
作者:
Vigil W Jr;Niks D;Franz-Badur S;Chowdhury N;Buckel W;Hille R

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我们对EtfAB/bcd的三个fad进行了光谱反卷积,以还原过程中所看到的光谱变化,包括电子转移和bcd黄素的阴离子和中性半醌态的光谱不同。我们还证明,与类似的系统不同,在用NAD+滴定还原的M. elsdenii EtfAB时没有观察到电荷转移络合物。最后,值得注意的是,我们发现从EtfAB中去除et FAD会导致留在蛋白质中的分叉FAD的半电位不交叉,这反映在用二亚硫酸钠还原滴定耗尽的EtfAB过程中大量FAD•−的积累中。
We have undertaken a spectral deconvolution of the three FADs of EtfAB/bcd to the spectral changes seen in the course of reduction, including the spectrally distinct anionic and neutral semiquinone states of electron-transferring and bcd flavins. We also demonstrate that, unlike similar systems, no charge-transfer complex is observed on titration of the reduced M. elsdenii EtfAB with NAD+. Finally, and significantly, we find that removal of the et FAD from EtfAB results in an uncrossing of the half-potentials of the bifurcating FAD that remains in the protein, as reflected in the accumulation of substantial FAD•− in the course of reductive titrations of the depleted EtfAB with sodium dithionite.
DOI: 10.1021/bi972864b
发表时间: 1998-05-19
期刊: BIOCHEMISTRY
影响因子: 2.9
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