A new era for electron bifurcation.

A new era for electron bifurcation.
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DOI:
10.1016/j.cbpa.2018.07.026
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发表时间:
2018-12
影响因子:
7.8
通讯作者:
--
中科院分区:
生物学2区
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--
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电子分叉,或放能和吸能氧化还原反应的耦合,是由彼得·米切尔发现的,并提供了一个优雅的机制来合理化和理解支撑呼吸链Q循环的逻辑。被认为是呼吸复合物III的独特反应近40年,大约十年前Wolfgang Buckel和Rudolf Thauer发现,黄素基电子分叉也是厌氧微生物代谢的重要组成部分。他们的发现催生了一系列研究活动,为理解黄素基分叉提供了基础,与米切尔的Q循环形成了基本的相似之处,并导致了金属基分叉酶的提出。对电子分叉机制的新认识为建立这一迷人的生物化学现象的统一原则和基本要素提供了基础。简单的电子分叉图,说明了来自电子供体(D)和随后的吸能和放能电子转移受体A1和A2的电子对的分叉。
Electron bifurcation, or the coupling of exergonic and endergonic oxidation-reduction reactions, was discovered by Peter Mitchell and provides an elegant mechanism to rationalize and understand the logic that underpins the Q cycle of the respiratory chain. Thought to be a unique reaction of respiratory complex III for nearly 40 years, about a decade ago Wolfgang Buckel and Rudolf Thauer discovered that flavin-based electron bifurcation is also an important component of anaerobic microbial metabolism. Their discovery spawned a surge of research activity, providing a basis to understand flavin-based bifurcation, forging fundamental parallels with Mitchell’s Q cycle and leading to the proposal of metal-based bifurcating enzymes. New insights into the mechanism of electron bifurcation provide a foundation to establish the unifying principles and essential elements of this fascinating biochemical phenomenon. Simple diagram of electron bifurcation illustrating the bifurcation of an electron pair from the electron donor (D) and the subsequent endergonic and exergonic electron transfers acceptors A1 and A2 respectively.
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