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:
Biochimica et biophysica acta. Bioenergetics
影响因子:
--
通讯作者:
Kaila VRI
Kaila VRI
中科院分区:
其他
文献类型:
--
作者:
Di Luca A;Mühlbauer ME;Saura P;Kaila VRI

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呼吸复合物I是一个氧化还原驱动的质子泵,它利用醌还原释放的自由能将质子泵过其完整的Ca。200 nm宽的膜结构域。尽管最近解决了结构和分子模拟,质子传输过程的确切机制仍然不清楚。在这里,我们结合联合收割机大规模的分子模拟与量子化学密度泛函理论(DFT)模型来研究如何在复杂的I的膜域中的相邻antiporter样亚基之间的接触影响质子转移能量学。我们的综合结果表明,开放的保守的赖氨酸/谷氨酸离子对在每个antiporter样亚基调制的横向质子转移反应的障碍。我们的工作提供了一个机制的建议,在复杂的长程力传播过程中的关键耦合效应。
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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