FEATURES

DESCRIPTION

Also known as PSAC_THEVB, psaC. Apoprotein for the two 4Fe-4S centers FA and FB of photosystem I (PSI); essential for photochemical activity. FB is the terminal electron acceptor of PSI, donating electrons to ferredoxin. The C-terminus interacts with PsaA/B/D and helps assemble the protein into the PSI complex. Required for binding of PsaD and PsaE to PSI. PSI is a plastocyanin/cytochrome c6-ferredoxin oxidoreductase, converting photonic excitation into a charge separation, which transfers an electron from the donor P700 chlorophyll pair to the spectroscopically characterized acceptors A0, A1, FX, FA and FB in turn. The cyanobacterial PSI reaction center is composed of one copy each of PsaA, B, C, D, E, F, I, J, K, L, M and X, and forms trimeric complexes.

EXTERNAL LINKS

psaC

Photosystem I iron-sulfur center

psaC

Molecular Synopsis