IUBMB Enzyme Nomenclature


Accepted name: photosystem I

Reaction: reduced plastocyanin + oxidized ferredoxin + = oxidized plastocyanin + reduced ferredoxin

Systematic name: plastocyanin:ferredoxin oxidoreductase (light-dependent)

Comments: 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: BRENDA, EXPASY, KEGG, Metacyc, PDB, CAS registry number:


1. Takabe, T., Iwasaki, Y., Hibino, T. and Ando, T. Subunit composition of photosystem I complex that catalyzes light-dependent transfer of electrons from plastocyanin to ferredoxin. J. Biochem. 110 (1991) 622-627. [PMID: 1778985]

2. van Thor, J.J., Geerlings, T.H., Matthijs, H.C. and Hellingwerf, K.J. Kinetic evidence for the PsaE-dependent transient ternary complex photosystem I/Ferredoxin/Ferredoxin:NADP+ reductase in a cyanobacterium. Biochemistry 38 (1999) 12735-12746. [PMID: 10504244]

3. Chitnis, P.R. Photosystem I: function and physiology. Annu. Rev. Plant Physiol. Plant Mol. Biol. 52 (2001) 593-626. [PMID: 11337410]

4. Amunts, A., Toporik, H., Borovikova, A. and Nelson, N. Structure determination and improved model of plant photosystem I. J. Biol. Chem. 285 (2010) 3478-3486. [PMID: 19923216]

[EC created 2011]

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