Probably participates in efficiency of electron transfer from plastocyanin to P700 (or cytochrome c553 in algae and cyanobacteria). This plastocyanin-docking protein contributes to the specific association of plastocyanin to PSI (By similarity)
UniRef90
Q1XDU4 • Photosystem I reaction center subunit III
Pfam
PF02507 • Photosystem I reaction centre subunit III