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Structural basis of LhcbM5-mediated state transitions in green algae, Nat Plants, 8 Jul 2021

发布时间:2021年07月08日

本文地址:http://391.293tyc.com/zxzylw/202107/t20210709_6129534.html
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Nature Plants, 8 July, 2021, DOI:真人版梭哈平台

Structural basis of LhcbM5-mediated state transitions in green algae

Xiaowei Pan, Ryutaro Tokutsu, Anjie Li, Kenji Takizawa, Chihong Song, Kazuyoshi Murata, Tomohito Yamasaki, Zhenfeng Liu, Jun Minagawa & Mei Li 

Abstract

In green algae and plants, state transitions serve as a short-term light-acclimation process in the regulation of the light-harvesting capacity of photosystems?I and II (PSI and PSII, respectively). During the process, a portion of light-harvesting complex II (LHCII) is phosphorylated, dissociated from PSII and binds with PSI to form the supercomplex PSI–LHCI–LHCII. Here, we report high-resolution structures of PSI–LHCI–LHCII from Chlamydomonas reinhardtii, revealing the mechanism of assembly between the PSI–LHCI complex and two phosphorylated LHCII trimers containing all four types of LhcbM protein. Two specific LhcbM isoforms, namely LhcbM1 and LhcbM5, directly interact with the PSI core through their phosphorylated amino terminal regions. Furthermore, biochemical and functional studies on mutant strains lacking either LhcbM1 or LhcbM5 indicate that only LhcbM5 is indispensable in supercomplex formation. The results unravel the specific interactions and potential excitation energy transfer routes between green algal PSI and two phosphorylated LHCIIs.

文章链接:http://www.262.5798983.com/articles/s41477-021-00960-8

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