Structure of the plant photosystem I

Biochemical Society Transactions
Ido Caspy, Nathan Nelson

Abstract

Plant photosystem I (PSI) is one of the most intricate membrane complexes in nature. It comprises two complexes, a reaction center and light-harvesting complex (LHC), which together form the PSI-LHC supercomplex. The crystal structure of plant PSI was solved with two distinct crystal forms. The first, crystallized at pH 6.5, exhibited P21 symmetry; the second, crystallized at pH 8.5, exhibited P212121 symmetry. The surfaces involved in binding plastocyanin and ferredoxin are identical in both forms. The crystal structure at 2.6 Å resolution revealed 16 subunits, 45 transmembrane helices, and 232 prosthetic groups, including 143 chlorophyll a, 13 chlorophyll b, 27 β-carotene, 7 lutein, 2 xanthophyll, 1 zeaxanthin, 20 monogalactosyl diglyceride, 7 phosphatidyl diglyceride, 5 digalactosyl diglyceride, 2 calcium ions, 2 phylloquinone, and 3 iron sulfur clusters. The model reveals detailed interactions, providing mechanisms for excitation energy transfer and its modulation in one of nature's most efficient photochemical machine.

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Citations

Oct 26, 2018·Journal of Experimental Botany·John R Evans, Victoria C Clarke
Sep 6, 2020·The Plant Journal : for Cell and Molecular Biology·Heta MattilaEsa Tyystjärvi
Jan 3, 2020·Photosynthesis Research·Ravindra KaleTerry M Bricker
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Dec 10, 2020·Plant Physiology and Biochemistry : PPB·Xiaohuan Mu, Yanling Chen
Nov 2, 2019·Biochimica Et Biophysica Acta. Bioenergetics·Anja Krieger-LiszkayPierre Sétif
Jan 1, 2021·International Journal of Molecular Sciences·Joanna WójtowiczKatarzyna B Gieczewska
Feb 2, 2020·Plant Science : an International Journal of Experimental Plant Biology·Jiazhi LuYufeng Liu
Mar 11, 2021·Physical Chemistry Chemical Physics : PCCP·Yigal LahavIgor Schapiro
Nov 18, 2019·Biochimica Et Biophysica Acta. Bioenergetics·Herbert van Amerongen, Jevgenij Chmeliov
May 26, 2020·Trends in Biotechnology·Alexandra H Teodor, Barry D Bruce
Jun 23, 2020·Biochimica Et Biophysica Acta. Bioenergetics·Ido CaspyNathan Nelson
Oct 29, 2021·The Plant Journal : for Cell and Molecular Biology·Andrew HitchcockDario Leister

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