Sequence alignment between 4j2p(A) and UniProt seq P09142 (LUXF_PHOLE):

P09142 (LUXF_PHOLE): Non-fluorescent flavoprotein from Photobacterium leiognathi
                 10        20        30        40        50        60        70        80        90       100       110       120       130       140       150       160       170       180       190       200       210       220        
         ---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+--------
UniProt: MTKWNYGVFFLNFYHVGQQEPSLTMSNALETLRIIDEDTSIYDVVAFSEHHIDKSYNDETKLAPFVSLGKQIHILATSPETVVKAAKYGMPLLFKWDDSQQKRIELLNHYQAAAAKFNVDIAGVRHRLMLFVNVNDNPTQAKAELSIYLEDYLSYTQAETSIDEIINSNAAGNFDTCLHHVAEMAQGLNNKVDFLFCFESMKDQENKKSLMINFDKRVINYRKEHNLN
         .......................................................XXX..........................................................................................................................................................................
PDB seq: MTKWNYGVFFLNFYHVGQQEPSLTMSNALETLRIIDEDTSIYDVVAFSEHHIDKS---ETKLAPFVSLGKQIHILATSPETVVKAAKYGMPLLFKWDDSQQKRIELLNHYQAAAAKFNVDIAGVRHRLMLFVNVNDNPTQAKAELSIYLEDYLSYTQAETSIDEIINSNAAGNFDTCLHHVAEMAQGLNNKVDFLFCFESMKDQENKKSLMINFDKRVINYRKEHNLN
         ---------+---------+---------+---------+---------+-----   -+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+--------
                 10        20        30        40        50        60        70        80        90       100       110       120       130       140       150       160       170       180       190       200       210       220