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TitleStructural basis for an early stage of the photosystem II repair cycle in Chlamydomonas reinhardtii.
Journal, issue, pagesNat Commun, Vol. 15, Issue 1, Page 5211, Year 2024
Publish dateJun 18, 2024
AuthorsAnjie Li / Tingting You / Xiaojie Pang / Yidi Wang / Lijin Tian / Xiaobo Li / Zhenfeng Liu /
PubMed AbstractPhotosystem II (PSII) catalyzes water oxidation and plastoquinone reduction by utilizing light energy. It is highly susceptible to photodamage under high-light conditions and the damaged PSII needs ...Photosystem II (PSII) catalyzes water oxidation and plastoquinone reduction by utilizing light energy. It is highly susceptible to photodamage under high-light conditions and the damaged PSII needs to be restored through a process known as the PSII repair cycle. The detailed molecular mechanism underlying the PSII repair process remains mostly elusive. Here, we report biochemical and structural features of a PSII-repair intermediate complex, likely arrested at an early stage of the PSII repair process in the green alga Chlamydomonas reinhardtii. The complex contains three protein factors associated with a damaged PSII core, namely Thylakoid Enriched Factor 14 (TEF14), Photosystem II Repair Factor 1 (PRF1), and Photosystem II Repair Factor 2 (PRF2). TEF14, PRF1 and PRF2 may facilitate the release of the manganese-stabilizing protein PsbO, disassembly of peripheral light-harvesting complexes from PSII and blockage of the Q site, respectively. Moreover, an α-tocopherol quinone molecule is located adjacent to the heme group of cytochrome b, potentially fulfilling a photoprotective role by preventing the generation of reactive oxygen species.
External linksNat Commun / PubMed:38890314 / PubMed Central
MethodsEM (single particle)
Resolution2.6 Å
Structure data

37133

8kde

EMDB-37133, PDB-8kde:
Cryo-EM structure of an intermediate-state complex during the process of photosystem II repair
Method: EM (single particle) / Resolution: 2.6 Å

Chemicals

ChemComp-CLA:
CHLOROPHYLL A

ChemComp-BCR:
BETA-CAROTENE

ChemComp-LMG:
1,2-DISTEAROYL-MONOGALACTOSYL-DIGLYCERIDE

ChemComp-LHG:
1,2-DIPALMITOYL-PHOSPHATIDYL-GLYCEROLE / phospholipid*YM

ChemComp-PL9:
2,3-DIMETHYL-5-(3,7,11,15,19,23,27,31,35-NONAMETHYL-2,6,10,14,18,22,26,30,34-HEXATRIACONTANONAENYL-2,5-CYCLOHEXADIENE-1,4-DIONE-2,3-DIMETHYL-5-SOLANESYL-1,4-BENZOQUINONE

ChemComp-PHO:
PHEOPHYTIN A

ChemComp-HEM:
PROTOPORPHYRIN IX CONTAINING FE

ChemComp-VTQ:
RRR-ALPHA-TOCOPHERYLQUINONE

ChemComp-DGD:
DIGALACTOSYL DIACYL GLYCEROL (DGDG)

ChemComp-SQD:
1,2-DI-O-ACYL-3-O-[6-DEOXY-6-SULFO-ALPHA-D-GLUCOPYRANOSYL]-SN-GLYCEROL

ChemComp-BCT:
BICARBONATE ION / pH buffer*YM

ChemComp-FE2:
Unknown entry

Source
  • chlamydomonas reinhardtii (plant)
KeywordsPHOTOSYNTHESIS / monomeric Photosystem II / PSII repair

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