Amino acid sequence of the 14-kDa protein in the photosystem I reaction center complex from Synechococcus elongatus Naegeli.

One of the small components (14 kDa) of the photosystem I reaction center complex was isolated from a thermophilic alga, Synechococcus elongatus. The amino acid sequence was determined. The protein consists of 137 amino acid residues, corresponding to the molecular mass of 15,319. Alignment of this sequence with the ferredoxin-binding proteins of photosystem I from other cyanobacteria and higher plants suggests the possible biologically important residues and the residues responsible for thermostability in the sequence.