A common ancestor for oxygenic and anoxygenic photosynthetic systems: a comparison based on the structural model of photosystem I.

A common ancestor for oxygenic and anoxygenic photosynthetic systems: a comparison based on the structural model of photosystem I.
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含氧和缺氧光合系统的共同祖先:基于光系统 I 结构模型的比较。

DOI:
10.1006/jmbi.1998.1824
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发表时间:
1998
影响因子:
5.6
通讯作者:
Norbert Krauß
Norbert Krauß
中科院分区:
生物学2区
文献类型:
--
作者:
Wolf;O. Klukas;Wolfram Saenger;H. T. Witt;Petra Fromme;Norbert Krauß

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4 光系统 I (PSI) 的结构模型阐明了该蛋白质复合物的基本特征。除其他外,它证明 PSI、PsaA 和 PsaB 的核心蛋白各自由 N 端天线结合域和 C 端反应中心 (RC) 域组成。 PSI 的 RC 结构域和紫色细菌 (PbRC) 的光合 RC 结构域的比较显示出明显相似的结构。这为两种 RC 类型(I 和 II)具有共同进化起源的假设提供了结构支持。除了电子转移系统的一组相似的组成辅因子之外,类似的特征还包括可比较的辅因子排列和 RC 核心的相应二级结构基序。尽管有这些相似之处,但显着差异是显而易见的,特别是在各个辅因子之间的距离和方向以及 α 螺旋的长度和方向方面。讨论了 PSI、光系统 II (PSII)、光系统 C(PSC,绿硫细菌)和光系统 H(PSH,日光细菌)中保守氨基酸的推断作用。 I 型 RC、PsaA、PsaB、PscA 和 PshA(分别为 PSI、PSC 和 PSH)核心蛋白的 N 端天线结合结构域与 PSII 的天线结合亚基 CP43 和 CP47 之间的显着序列同源性表明 PSII 具有与 PSI 相当的模块结构。
The 4 A structural model of photosystem I (PSI) has elucidated essential features of this protein complex. Inter alia, it demonstrates that the core proteins of PSI, PsaA and PsaB each consist of an N-terminal antenna-binding domain, and a C-terminal reaction center (RC)-domain. A comparison of the RC-domain of PSI and the photosynthetic RC of purple bacteria (PbRC), reveals significantly analogous structures. This provides the structural support for the hypothesis that the two RC-types (I and II) share a common evolutionary origin. Apart from a similar set of constituent cofactors of the electron transfer system, the analogous features include a comparable cofactor arrangement and a corresponding secondary structure motif of the RC-cores. Despite these analogies, significant differences are evident, particularly as regards the distances between and the orientation of individual cofactors, and the length and orientation of alpha-helices. Inferred roles of conserved amino acids are discussed for PSI, photosystem II (PSII), photosystem C (PSC, green sulfur bacteria) and photosystem H (PSH, heliobacteria). Significant sequence homology between the N-terminal, antenna-binding domains of the core proteins of type-I RCs, PsaA, PsaB, PscA and PshA (of PSI, PSC and PSH respectively) with the antenna-binding subunits CP43 and CP47 of PSII indicate that PSII has a modular structure comparable to that of PSI.
DOI: 10.1021/bi00236a005
发表时间: 1991-06-04
期刊: BIOCHEMISTRY
影响因子: 2.9
作者:
CHANG, CH;ELKABBANI, O;SCHIFFER, M
通讯作者: SCHIFFER, M
鉴定组氨酸作为 P700 的轴向配体。
DOI: 10.1021/bi961765f
发表时间: 1996
期刊: Biochemistry.
影响因子: --
作者:
Mac,M;Tang,XS;Diner,BA;McCracken,J;Babcock,GT
通讯作者: Babcock,GT