The photosystem I (PSI) of the chloroplast is a multisubunit membrane protein complex that catalyzes the transfer of electrons from plastocyanin (or cytochrome c6) reduced in the thylakoid cavity to oxidized ferredoxin (or xanthodoxin) in the chloroplast matrix. PsaN is required for docking plastocyanin with the PSI complex. Psi-n is the only subunit located entirely on the side of the PSI lumen.
For research use only, not for clinical use.