Structure of the far-red light utilizing photosystem I of Acaryochloris marina.

Structure of the far-red light utilizing photosystem I of Acaryochloris marina.
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DOI:
10.1038/s41467-021-22502-8
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发表时间:
2021-04-20
影响因子:
16.6
通讯作者:
Kashino Y
Kashino Y
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Hamaguchi T;Kawakami K;Shinzawa-Itoh K;Inoue-Kashino N;Itoh S;Ifuku K;Yamashita E;Maeda K;Yonekura K;Kashino Y

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无氯蓝藻是一种能够利用远红光驱动光化学反应进行氧合光合作用的蓝藻。在这里,我们报道了滨海裸藻光系统I(PSI)反应中心的结构,这是由2.58 á分辨率的冷冻电子显微镜确定的。该结构揭示了不同于其他I类反应中心的电子载体和捕光颜料的排列。成对的叶绿素,或特殊对(在这种情况下也称为P740),是叶绿素d及其同分异构体叶绿素d‘的二聚体。主要的电子受体是叶绿酸a,一种不含金属的氯离子。我们展示了PSI反应中心的结构由11个亚基组成,并确定了有助于解释远红光的低能量产量如何有效地用于驱动氧合光合作用的关键组件。无叶绿藻光系统I(PSI)含有叶绿素d,在光谱的远红区吸收光。Marina PSI反应中心的结构显示出一些不寻常的特征,其中包括作为主要电子受体的叶黄素。
Acaryochloris marina is one of the cyanobacterial species that can use far-red light to drive photochemical reactions for oxygenic photosynthesis. Here, we report the structure of A. marina photosystem I (PSI) reaction center, determined by cryo-electron microscopy at 2.58 Å resolution. The structure reveals an arrangement of electron carriers and light-harvesting pigments distinct from other type I reaction centers. The paired chlorophyll, or special pair (also referred to as P740 in this case), is a dimer of chlorophyll d and its epimer chlorophyll d′. The primary electron acceptor is pheophytin a, a metal-less chlorin. We show the architecture of this PSI reaction center is composed of 11 subunits and we identify key components that help explain how the low energy yield from far-red light is efficiently utilized for driving oxygenic photosynthesis. Acaryochloris marina photosystem I (PSI) contains chlorophyll d and absorbs light in the far-red region of the spectrum. The structure of A. marina PSI reaction center reveals several unusual features, including pheophytin as the primary electron acceptor.
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