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Science. 2019 Aug 2;365(6452). pii: eaax4406. doi: 10.1126/science.aax4406.

The pigment-protein network of a diatom photosystem II-light-harvesting antenna supercomplex.

Pi X#1, Zhao S#2,3, Wang W#2, Liu D1, Xu C2,3, Han G2, Kuang T4, Sui SF5, Shen JR4,6.

Author information

1
State Key Laboratory of Membrane Biology, Beijing Advanced Innovation Center for Structural Biology, School of Life Sciences, Tsinghua University, Beijing 100084, China.
2
Photosynthesis Research Center, Key Laboratory of Photobiology, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China.
3
University of Chinese Academy of Sciences, Yuquan Road, Shijingshan District, Beijing 100049, China.
4
Photosynthesis Research Center, Key Laboratory of Photobiology, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China. kuangty@ibcas.ac.cn suisf@mail.tsinghua.edu.cn shen@cc.okayama-u.ac.jp.
5
State Key Laboratory of Membrane Biology, Beijing Advanced Innovation Center for Structural Biology, School of Life Sciences, Tsinghua University, Beijing 100084, China. kuangty@ibcas.ac.cn suisf@mail.tsinghua.edu.cn shen@cc.okayama-u.ac.jp.
6
Research Institute for Interdisciplinary Science, Graduate School of Natural Science and Technology, Okayama University, Okayama 700-8530, Japan.
#
Contributed equally

Abstract

Diatoms play important roles in global primary productivity and biogeochemical cycling of carbon, in part owing to the ability of their photosynthetic apparatus to adapt to rapidly changing light intensity. We report a cryo-electron microscopy structure of the photosystem II (PSII)-fucoxanthin (Fx) chlorophyll (Chl) a/c binding protein (FCPII) supercomplex from the centric diatom Chaetoceros gracilis The supercomplex comprises two protomers, each with two tetrameric and three monomeric FCPIIs around a PSII core that contains five extrinsic oxygen-evolving proteins at the lumenal surface. The structure reveals the arrangement of a huge pigment network that contributes to efficient light energy harvesting, transfer, and dissipation processes in the diatoms.

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PMID:
31371578
DOI:
10.1126/science.aax4406

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