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TitleStructure of a unique PSII-Pcb tetrameric megacomplex in a chlorophyll -containing cyanobacterium.
Journal, issue, pagesSci Adv, Vol. 10, Issue 8, Page eadk7140, Year 2024
Publish dateFeb 23, 2024
AuthorsLiangliang Shen / Yuanzhu Gao / Kailu Tang / Ruxi Qi / Lutang Fu / Jing-Hua Chen / Wenda Wang / Xiaomin Ma / Peiyao Li / Min Chen / Tingyun Kuang / Xing Zhang / Jian-Ren Shen / Peiyi Wang / Guangye Han /
PubMed Abstract is a unique cyanobacterium using chlorophyll (Chl ) as its major pigment and thus can use far-red light for photosynthesis. Photosystem II (PSII) of associates with a number of prochlorophyte Chl- ... is a unique cyanobacterium using chlorophyll (Chl ) as its major pigment and thus can use far-red light for photosynthesis. Photosystem II (PSII) of associates with a number of prochlorophyte Chl-binding (Pcb) proteins to act as the light-harvesting system. We report here the cryo-electron microscopic structure of a PSII-Pcb megacomplex from at a 3.6-angstrom overall resolution and a 3.3-angstrom local resolution. The megacomplex is organized as a tetramer consisting of two PSII core dimers flanked by sixteen symmetrically related Pcb proteins, with a total molecular weight of 1.9 megadaltons. The structure reveals the detailed organization of PSII core consisting of 15 known protein subunits and an unknown subunit, the assembly of 4 Pcb antennas within each PSII monomer, and possible pathways of energy transfer within the megacomplex, providing deep insights into energy transfer and dissipation mechanisms within the PSII-Pcb megacomplex involved in far-red light utilization.
External linksSci Adv / PubMed:38394197 / PubMed Central
MethodsEM (single particle)
Resolution3.3 - 3.6 Å
Structure data

33929

7ymi

EMDB-33929, PDB-7ymi:
PSII-Pcb Dimer of Acaryochloris Marina
Method: EM (single particle) / Resolution: 3.3 Å

33933

7ymm

EMDB-33933, PDB-7ymm:
PSII-Pcb Tetramer of Acaryochloris Marina
Method: EM (single particle) / Resolution: 3.6 Å

Chemicals

ChemComp-CL7:
CHLOROPHYLL D

ChemComp-PHO:
PHEOPHYTIN A

ChemComp-8CT:
(6'R,11cis,11'cis,13cis,15cis)-4',5'-didehydro-5',6'-dihydro-beta,beta-carotene

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

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

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

ChemComp-DGD:
DIGALACTOSYL DIACYL GLYCEROL (DGDG)

ChemComp-FE2:
Unknown entry

ChemComp-BCT:
BICARBONATE ION

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-HEM:
PROTOPORPHYRIN IX CONTAINING FE

ChemComp-ZEX:
(1R,2S)-4-{(1E,3E,5E,7E,9E,11E,13E,15E,17E)-18-[(4S)-4-hydroxy-2,6,6-trimethylcyclohex-1-en-1-yl]-3,7,12,16-tetramethyloctadeca-1,3,5,7,9,11,13,15,17-nonaen-1-yl}-2,5,5-trimethylcyclohex-3-en-1-ol

Source
  • acaryochloris marina mbic11017 (bacteria)
KeywordsPHOTOSYNTHESIS / Photosystem II / Pcb

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