EC - Photosystem I

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IntEnz Enzyme Nomenclature


Accepted name:
photosystem I
Systematic name:
plastocyanin:ferredoxin oxidoreductase (light-dependent)



Contains chlorophyll, phylloquinones, carotenoids and [4Fe-4S] clusters. Cytochrome c6 can act as an alternative electron donor, and flavodoxin as an alternative acceptor in some species.

Links to other databases

Enzymes and pathways: NC-IUBMB , BRENDA , ExplorEnz , ENZYME@ExPASy , KEGG , MetaCyc , UniPathway
Structural data: CSA , EC2PDB
UniProtKB/Swiss-Prot: (457) [show] [UniProt]


  1. Takabe, T., Iwasaki, Y., Hibino, T., Ando, T.
    Subunit composition of Photosystem I complex that catalyzes light-dependent transfer of electrons from plastocyanin to ferredoxin.
    J. Biochem. 110: 622-627 (1991). [PMID: 1778985]
  2. van Thor, J. J., Geerlings, T. H., Matthijs, H. C., Hellingwerf, K. J.
    Kinetic evidence for the PsaE-dependent transient ternary complex photosystem I/Ferredoxin/Ferredoxin:NADP+ reductase in a cyanobacterium.
    Biochemistry 38: 12735-12746 (1999). [PMID: 10504244]
  3. Chitnis, P. R.
    Photosystem I: function and physiology.
    Annu. Rev. Plant Physiol. Plant Mol. Biol. 52: 593-626 (2001). [PMID: 11337410]
  4. Amunts, A., Toporik, H., Borovikova, A., Nelson, N.
    Structure determination and improved model of plant photosystem I.
    J. Biol. Chem. 285: 3478-3486 (2010). [PMID: 19923216]

[EC created 2011]