Sequence alignment between 5kaf(I) and UniProt seq Q8DJZ6 (PSBI_THEEB):

Q8DJZ6 (PSBI_THEEB): Photosystem II reaction center protein I from Thermosynechococcus vestitus (strain NIES-2133 / IAM M-273 / BP-1) 
                 10        20        30        
         ---------+---------+---------+--------
UniProt: METLKITVYIVVTFFVLLFVFGFLSGDPARNPKRKDLE
         X.....................................
PDB seq: XETLKITVYIVVTFFVLLFVFGFLSGDPARNPKRKD--
         ---------+---------+---------+------  
                 10        20        30