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Title: Assembly and Repair of Photosystem II in Chlamydomonas reinhardtii

Journal Article · · Plants

Oxygenic photosynthetic organisms use Photosystem II (PSII) to oxidize water and reduce plastoquinone. Here, we review the mechanisms by which PSII is assembled and turned over in the model green alga Chlamydomonas reinhardtii. This species has been used to make key discoveries in PSII research due to its metabolic flexibility and amenability to genetic approaches. PSII subunits originate from both nuclear and chloroplastic gene products in Chlamydomonas. Nuclear-encoded PSII subunits are transported into the chloroplast and chloroplast-encoded PSII subunits are translated by a coordinated mechanism. Active PSII dimers are built from discrete reaction center complexes in a process facilitated by assembly factors. The phosphorylation of core subunits affects supercomplex formation and localization within the thylakoid network. Proteolysis primarily targets the D1 subunit, which when replaced, allows PSII to be reactivated and completes a repair cycle. While PSII has been extensively studied using Chlamydomonas as a model species, important questions remain about its assembly and repair which are presented here.

Sponsoring Organization:
USDOE
Grant/Contract Number:
SC0020119
OSTI ID:
2323362
Journal Information:
Plants, Journal Name: Plants Vol. 13 Journal Issue: 6; ISSN 2223-7747
Publisher:
MDPI AGCopyright Statement
Country of Publication:
Netherlands
Language:
English

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