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TitleThe cryo-EM structure of Photosystem I from Chromera velia with a bound superoxide dismutase heterodimer.
Journal, issue, pagesNat Commun, Vol. 17, Issue 1, Page 913, Year 2025
Publish dateDec 21, 2025
AuthorsXukun Yuan / Martin Lukeš / Pu Qian / Quentin Charras / Tomáš Smrčka / Petr Man / Lucie Kovářová / Peter Koník / Emmanuel Heilmann / Ashraf Al-Amoudi / Roman Sobotka / Andreas Naschberger /
PubMed AbstractPhotosystem I is a key component of the solar energy conversion machinery in oxygenic photosynthesis, and its core, where photochemistry occurs, is highly conserved. However, the coral-associated ...Photosystem I is a key component of the solar energy conversion machinery in oxygenic photosynthesis, and its core, where photochemistry occurs, is highly conserved. However, the coral-associated alga Chromera velia that is evolutionary linked to parasitic apicomplexans, exhibits Photosystem I with unusual features. These include the splitting of the central PsaA subunit and the binding of superoxide dismutases as regular subunits. The organization of such a unique Photosystem I was enigmatic. Here, we present the cryo-EM structure of Chromera velia Photosystem I at 1.84 Å resolution. Our work reveals a superoxide dismutase heterodimer bound to the stromal side of the core, stabilized by extensions of canonical subunits, a novel protein PsaV, and a reduced light-harvesting apparatus. We elucidate how the complex evolved to accommodate the superoxide dismutase, assemble the split PsaA, and integrate antenna proteins in a non-canonical orientation. Based on our data and prior physiological data, we propose that this specialized Photosystem I functions likely as an Mehler machine, redirecting electrons from Photosystem II back to water. This mechanism enables Chromera velia to manage redox imbalance and reduce photorespiration through localized oxygen consumption.
External linksNat Commun / PubMed:41423677 / PubMed Central
MethodsEM (single particle)
Resolution1.84 Å
Structure data

52518

9hyu

EMDB-52518, PDB-9hyu:
Cryo-EM structure of the Chromera velia PSI supercomplex at 1.84 Angstrom resolution
Method: EM (single particle) / Resolution: 1.84 Å

Chemicals

ChemComp-FE:
Unknown entry

ChemComp-CLA:
CHLOROPHYLL A

ChemComp-CL0:
CHLOROPHYLL A ISOMER

ChemComp-SF4:
IRON/SULFUR CLUSTER

ChemComp-PQN:
PHYLLOQUINONE

ChemComp-XAT:
(3S,5R,6S,3'S,5'R,6'S)-5,6,5',6'-DIEPOXY-5,6,5',6'- TETRAHYDRO-BETA,BETA-CAROTENE-3,3'-DIOL

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

ChemComp-DGD:
DIGALACTOSYL DIACYL GLYCEROL (DGDG)

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

ChemComp-BCR:
BETA-CAROTENE

ChemComp-AV0:
Lauryl Maltose Neopentyl Glycol


PDB Unreleased entry

PDB-1l6d: Crystal Structure of a Ternary Complex of E.Coli HPPK(V83G/DEL84-89) with MGAMPCPP and 6-Hydroxymethyl-7,8-Dihydropterin at 1.40 Angstrom Resolution (Monoclinic Form)

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

PDB-1i05:
CRYSTAL STRUCTURE OF MOUSE MAJOR URINARY PROTEIN (MUP-I) COMPLEXED WITH HYDROXY-METHYL-HEPTANONE

ChemComp-HOH:
WATER

Source
  • chromera velia (eukaryote)
KeywordsPHOTOSYNTHESIS / Photosystem I / PSI-FCP complex / Chrome velia / Cryo-EM.

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