How inter-subunit contacts in the membrane domain of complex I affect proton transfer energetics.
How inter-subunit contacts in the membrane domain of complex I affect proton transfer energetics.
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DOI:
10.1016/j.bbabio.2018.06.001
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发表时间:
2018-09
期刊:
影响因子:
--
通讯作者:
Kaila VRI
中科院分区:
文献类型:
--
作者:
Di Luca A;Mühlbauer ME;Saura P;Kaila VRI
The respiratory complex I is a redox-driven proton pump that employs the free energy released from quinone reduction to pump protons across its complete ca. 200 Å wide membrane domain. Despite recently resolved structures and molecular simulations, the exact mechanism for the proton transport process remains unclear. Here we combine large-scale molecular simulations with quantum chemical density functional theory (DFT) models to study how contacts between neighboring antiporter-like subunits in the membrane domain of complex I affect the proton transfer energetics. Our combined results suggest that opening of conserved Lys/Glu ion pairs within each antiporter-like subunit modulates the barrier for the lateral proton transfer reactions. Our work provides a mechanistic suggestion for key coupling effects in the long-range force propagation process of complex I.
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DOI:
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DOI:
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发表时间:
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期刊:
The Journal of biological chemistry
影响因子:
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