Long-range proton-coupled electron transfer in biological energy conversion: towards mechanistic understanding of respiratory complex I.

Long-range proton-coupled electron transfer in biological energy conversion: towards mechanistic understanding of respiratory complex I.
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DOI:
10.1098/rsif.2017.0916
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发表时间:
2018-04
期刊:
Journal of the Royal Society, Interface
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:
Kaila VRI

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生物能的转换是由高效的酶驱动的,这些酶能捕获、储存和远距离转移质子和电子。结构生物学的最新进展为这些类型的分子机制提供了原子尺度的蓝图,再加上生化、生物物理和计算实验,使我们第一次获得了详细的能量转导机制。在这里,我介绍了一种最复杂和最不为人所知的生物能量转换机制,呼吸复合物I,以及它的氧化还原驱动的质子泵如何催化大约300 Å距离的电荷转移。在讨论了配合物I的功能元素后,提出了其远距离作用效应的假设机制模型,并与其他氧化还原和光驱动离子泵的功能相似。
Biological energy conversion is driven by efficient enzymes that capture, store and transfer protons and electrons across large distances. Recent advances in structural biology have provided atomic-scale blueprints of these types of remarkable molecular machinery, which together with biochemical, biophysical and computational experiments allow us to derive detailed energy transduction mechanisms for the first time. Here, I present one of the most intricate and least understood types of biological energy conversion machinery, the respiratory complex I, and how its redox-driven proton-pump catalyses charge transfer across approximately 300 Å distances. After discussing the functional elements of complex I, a putative mechanistic model for its action-at-a-distance effect is presented, and functional parallels are drawn to other redox- and light-driven ion pumps.
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