Binding Interface and Electron Transfer Between Nicotine Oxidoreductase and Its Cytochrome c Electron Acceptor.
Binding Interface and Electron Transfer Between Nicotine Oxidoreductase and Its Cytochrome c Electron Acceptor.
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尼古丁氧化还原酶与其细胞色素 c 电子受体之间的结合界面和电子转移。
DOI:
10.1021/acs.biochem.2c00472
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发表时间:
2022-10-18
期刊:
影响因子:
2.9
通讯作者:
Stull, Frederick
中科院分区:
文献类型:
--
作者:
Mumby, Elizabeth J.;Willoughby, Jamin A., Jr.;Vasquez, Cristian;Delavari, Niusha;Zhang, Zhiyao;Clark, Christopher T.;Stull, Frederick
The enzyme nicotine oxidoreductase (NicA2) is a member of the flavoprotein amine oxidase family that uses a cytochrome c protein (CycN) as its oxidant instead of dioxygen, which is the oxidant used by most other members of this enzyme family. We recently identified a potential binding site for CycN on the surface of NicA2 through rigid body docking [J. Biol. Chem. (2022) 298(8), 102251]. However, this potential binding interface has not been experimentally validated. In this paper, we used unnatural amino acid incorporation to probe the binding interface between NicA2 and CycN. Our results are consistent with a structural model of the NicA2-CycN complex predicted by protein-protein docking and AlphaFold, suggesting that this is the binding site for CycN on NicA2’s surface. Based on additional mutagenesis of potentially redox active residues in NicA2, we propose that electron transfer from NicA2’s flavin to CycN’s heme occurs without the assistance of a protein-derived wire.
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