Cardona Tanai, Sedoud Arezki, Cox Nicholas, Rutherford A William
Institut de Biologie et Technologies de Saclay, URA 2096 CNRS, CEA Saclay, 91191 Gif-sur-Yvette, France.
Biochim Biophys Acta. 2012 Jan;1817(1):26-43. doi: 10.1016/j.bbabio.2011.07.012. Epub 2011 Jul 30.
Our current understanding of the PSII reaction centre owes a great deal to comparisons to the simpler and better understood, purple bacterial reaction centre. Here we provide an overview of the similarities with a focus on charge separation and the electron acceptors. We go on to discuss some of the main differences between the two kinds of reaction centres that have been highlighted by the improving knowledge of PSII. We attempt to relate these differences to functional requirements of water splitting. Some are directly associated with that function, e.g. high oxidation potentials, while others are associated with regulation and protection against photodamage. The protective and regulatory functions are associated with the harsh chemistry performed during its normal function but also with requirements of the enzyme while it is undergoing assembly and repair. Key aspects of PSII reaction centre evolution are also addressed. This article is part of a Special Issue entitled: Photosystem II.
我们目前对光系统II反应中心的理解在很大程度上得益于与更简单且理解得更好的紫色细菌反应中心的比较。在此，我们将概述二者的相似之处，重点关注电荷分离和电子受体。接着，我们将讨论随着对光系统II了解的不断深入所凸显出的这两种反应中心之间的一些主要差异。我们试图将这些差异与水裂解的功能需求联系起来。其中一些差异与该功能直接相关，例如高氧化电位，而其他一些则与调节以及防止光损伤有关。这些保护和调节功能不仅与光系统II正常功能过程中所进行的严苛化学反应相关，还与该酶在组装和修复过程中的需求有关。本文还将探讨光系统II反应中心进化的关键方面。本文是名为《光系统II》的特刊的一部分。
