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TitleStructural insights into cyanobacterial photosystem II intermediates associated with Psb28 and Tsl0063.
Journal, issue, pagesNat Plants, Vol. 7, Issue 8, Page 1132-1142, Year 2021
Publish dateJul 5, 2021
AuthorsYanan Xiao / Guoqiang Huang / Xin You / Qingjun Zhu / Wenda Wang / Tingyun Kuang / Guangye Han / Sen-Fang Sui / Jian-Ren Shen /
PubMed AbstractPhotosystem II (PSII) is a multisubunit pigment-protein complex and catalyses light-induced water oxidation, leading to the conversion of light energy into chemical energy and the release of dioxygen. ...Photosystem II (PSII) is a multisubunit pigment-protein complex and catalyses light-induced water oxidation, leading to the conversion of light energy into chemical energy and the release of dioxygen. We analysed the structures of two Psb28-bound PSII intermediates, Psb28-RC47 and Psb28-PSII, purified from a psbV-deletion strain of the thermophilic cyanobacterium Thermosynechococcus vulcanus, using cryo-electron microscopy. Both Psb28-RC47 and Psb28-PSII bind one Psb28, one Tsl0063 and an unknown subunit. Psb28 is located at the cytoplasmic surface of PSII and interacts with D1, D2 and CP47, whereas Tsl0063 is a transmembrane subunit and binds at the side of CP47/PsbH. Substantial structural perturbations are observed at the acceptor side, which result in conformational changes of the quinone (Q) and non-haem iron binding sites and thus may protect PSII from photodamage during assembly. These results provide a solid structural basis for understanding the assembly process of native PSII.
External linksNat Plants / PubMed:34226692
MethodsEM (single particle)
Resolution3.14 Å
Structure data

30902

7dxa

EMDB-30902, PDB-7dxa:
PSII intermediate Psb28-RC47
Method: EM (single particle) / Resolution: 3.14 Å

30909

7dxh

EMDB-30909, PDB-7dxh:
Cryo-EM structure of PSII intermediate Psb28-PSII complex
Method: EM (single particle) / Resolution: 3.14 Å

Chemicals

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

ChemComp-CLA:
CHLOROPHYLL A

ChemComp-PHO:
PHEOPHYTIN A

ChemComp-BCR:
BETA-CAROTENE

ChemComp-CL:
Unknown entry

ChemComp-MGE:
(1S)-2-(ALPHA-L-ALLOPYRANOSYLOXY)-1-[(TRIDECANOYLOXY)METHYL]ETHYL PALMITATE


ChemComp, No image

ChemComp-UNL:
Unknown ligand

ChemComp-LMT:
DODECYL-BETA-D-MALTOSIDE / detergent*YM

ChemComp-FE2:
Unknown entry

ChemComp-PQ9:
5-[(2E,6E,10E,14E,18E,22E)-3,7,11,15,19,23,27-HEPTAMETHYLOCTACOSA-2,6,10,14,18,22,26-HEPTAENYL]-2,3-DIMETHYLBENZO-1,4-QUINONE

ChemComp-HTG:
heptyl 1-thio-beta-D-glucopyranoside / detergent*YM

ChemComp-DGD:
DIGALACTOSYL DIACYL GLYCEROL (DGDG)

ChemComp-HEM:
PROTOPORPHYRIN IX CONTAINING FE

Source
  • thermosynechococcus vulcanus (bacteria)
KeywordsPLANT PROTEIN / Photosystem II; Cryo-EM; assembly; repair; Psb28; Tsl0063

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