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TitleStructural basis for the distinct core-antenna assembly of cryptophyte photosystem II.
Journal, issue, pagesNat Commun, Vol. 15, Issue 1, Page 6812, Year 2024
Publish dateAug 9, 2024
AuthorsLong Si / Shumeng Zhang / Xiaodong Su / Mei Li /
PubMed AbstractPhotosystem II (PSII) catalyzes the light-driven charge separation and water oxidation reactions of photosynthesis. Eukaryotic PSII core is usually associated with membrane-embedded light-harvesting ...Photosystem II (PSII) catalyzes the light-driven charge separation and water oxidation reactions of photosynthesis. Eukaryotic PSII core is usually associated with membrane-embedded light-harvesting antennae, which greatly increase the absorbance cross-section of the core. The peripheral antennae in different phototrophs vary considerably in protein composition and arrangement. Photosynthetic cryptophytes possess chlorophyll a/c binding proteins (CACs) that serve as their antennae. How these CACs assemble with the PSII core remains unclear. Here, we report the 2.57-Å resolution structure of cryptophyte PSII-CAC purified from cells at nitrogen-limited stationary growth phase. We show that each monomer of the PSII homodimer contains a core complex, six chlorophyll a/c binding proteins (CACs) and a previously unseen chlorophyll-binding protein (termed CAL-II). Six CACs are arranged as a double-layered arc-shaped non-parallel belt, and two such belts attach to the dimeric core from opposite sides. The CAL-II simultaneously interacts with a number of core subunits and five CACs. The distinct organization of CACs and the presence of CAL-II may play a critical role in stabilizing the dimeric PSII-CAC complex under stress conditions. Our study provides mechanistic insights into the assembly and function of the PSII-CAC complex as well as the possible adaptation of cryptophytes in response to environmental stresses.
External linksNat Commun / PubMed:39122741 / PubMed Central
MethodsEM (single particle)
Resolution2.57 - 2.9 Å
Structure data

38455

8xlp

EMDB-38455, PDB-8xlp:
Structure of inactive Photosystem II associated with CAC antenna from Rhodomonas Salina
Method: EM (single particle) / Resolution: 2.57 Å

EMDB-38912: Overall map of PSII-CAC
Method: EM (single particle) / Resolution: 2.57 Å

EMDB-38913: Focus refinement map of PSII-CAC
Method: EM (single particle) / Resolution: 2.9 Å

Chemicals

ChemComp-FE2:
Unknown entry

ChemComp-CLA:
CHLOROPHYLL A

ChemComp-PHO:
PHEOPHYTIN A


ChemComp, No image

ChemComp-WVN:
Unknown entry

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

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-BCT:
BICARBONATE ION / pH buffer*YM

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

ChemComp-CL:
Unknown entry

ChemComp-MN:
Unknown entry

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

ChemComp-DGD:
DIGALACTOSYL DIACYL GLYCEROL (DGDG)

ChemComp-HEM:
PROTOPORPHYRIN IX CONTAINING FE

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-HOH:
WATER

Source
  • rhodomonas salina (eukaryote)
KeywordsPHOTOSYNTHESIS / Photosystem II associated with CAC antenna from Rhodomonas Salina

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