Photosystem I is an integral membrane protein complex that uses light energy to catalyze the transfer of electrons across the thylakoid membrane from plastocyanin to ferredoxin. (wikipedia.org)
Oxidized P700 is reduced on the lumenal side of the thylakoid membrane by plastocyanin or cytochrome c6. (cansar.ai)
P7004
Located within the antenna complex of PSI are molecules of chlorophyll called P700 reaction centers. (wikipedia.org)
However, if P700 forms a complex with other antenna molecules, it can no longer be a dimer. (wikipedia.org)
A0 accepts electrons from P700*, passes it to A1 of the same side, which then passes the electron to the quinone on the same side. (wikipedia.org)
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. (cansar.ai)
Antenna complex3
Photoexcitation of the pigment molecules in the antenna complex induces electron and energy transfer. (wikipedia.org)
The antenna complex is composed of molecules of chlorophyll and carotenoids mounted on two proteins. (wikipedia.org)
PSI consists of a core antenna complex that captures photons, and an electron transfer chain that converts photonic excitation into a charge separation. (cansar.ai)
Branches1
They are present one per PsaA/PsaB side, forming two branches electrons can take to reach Fx. (wikipedia.org)
Electron1
In one model, Fx passes an electron to Fa, which passes it on to Fb to reach the ferredoxin. (wikipedia.org)