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TitleStructure of cryptophyte photosystem II-light-harvesting antennae supercomplex.
Journal, issue, pagesNat Commun, Vol. 15, Issue 1, Page 4999, Year 2024
Publish dateJun 12, 2024
AuthorsYu-Zhong Zhang / Kang Li / Bing-Yue Qin / Jian-Ping Guo / Quan-Bao Zhang / Dian-Li Zhao / Xiu-Lan Chen / Jun Gao / Lu-Ning Liu / Long-Sheng Zhao /
PubMed AbstractCryptophytes are ancestral photosynthetic organisms evolved from red algae through secondary endosymbiosis. They have developed alloxanthin-chlorophyll a/c2-binding proteins (ACPs) as light- ...Cryptophytes are ancestral photosynthetic organisms evolved from red algae through secondary endosymbiosis. They have developed alloxanthin-chlorophyll a/c2-binding proteins (ACPs) as light-harvesting complexes (LHCs). The distinctive properties of cryptophytes contribute to efficient oxygenic photosynthesis and underscore the evolutionary relationships of red-lineage plastids. Here we present the cryo-electron microscopy structure of the Photosystem II (PSII)-ACPII supercomplex from the cryptophyte Chroomonas placoidea. The structure includes a PSII dimer and twelve ACPII monomers forming four linear trimers. These trimers structurally resemble red algae LHCs and cryptophyte ACPI trimers that associate with Photosystem I (PSI), suggesting their close evolutionary links. We also determine a Chl a-binding subunit, Psb-γ, essential for stabilizing PSII-ACPII association. Furthermore, computational calculation provides insights into the excitation energy transfer pathways. Our study lays a solid structural foundation for understanding the light-energy capture and transfer in cryptophyte PSII-ACPII, evolutionary variations in PSII-LHCII, and the origin of red-lineage LHCIIs.
External linksNat Commun / PubMed:38866834 / PubMed Central
MethodsEM (single particle)
Resolution2.53 Å
Structure data

38596

8xr6

EMDB-38596, PDB-8xr6:
Cryo-EM structure of cryptophyte photosystem II
Method: EM (single particle) / Resolution: 2.53 Å

Chemicals

ChemComp-OEX:
CA-MN4-O5 CLUSTER

ChemComp-FE2:
Unknown entry

ChemComp-BCT:
BICARBONATE ION

ChemComp-CL:
Unknown entry

ChemComp-CLA:
CHLOROPHYLL A

ChemComp-PHO:
PHEOPHYTIN A

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

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

ChemComp-KC2:
Chlorophyll c2

ChemComp-II0:
(1~{R})-3,5,5-trimethyl-4-[(3~{E},5~{E},7~{E},9~{E},11~{E},13~{E},15~{E})-3,7,12,16-tetramethyl-18-[(4~{R})-2,6,6-trimethyl-4-oxidanyl-cyclohexen-1-yl]octadeca-3,5,7,9,11,13,15-heptaen-1,17-diynyl]cyclohex-3-en-1-ol

ChemComp-IHT:
(1~{R})-3,5,5-trimethyl-4-[(3~{E},5~{E},7~{E},9~{E},11~{E},13~{E},15~{E},17~{E})-3,7,12,16-tetramethyl-18-(2,6,6-trimethylcyclohexen-1-yl)octadeca-3,5,7,9,11,13,15,17-octaen-1-ynyl]cyclohex-3-en-1-ol

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

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

ChemComp-DGD:
DIGALACTOSYL DIACYL GLYCEROL (DGDG)

ChemComp-HEM:
PROTOPORPHYRIN IX CONTAINING FE

ChemComp-HOH:
WATER

Source
  • chroomonas placoidea (eukaryote)
KeywordsPHOTOSYNTHESIS / Cryptophyte / Photosystem II / evolution

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