ACT_SITE 44; /note="Charge relay system"; /evidence="ECO:0000250|UniProtKB:P15367"; ACT_SITE 83; /note="Charge relay system"; /evidence="ECO:0000250|UniProtKB:P15367"; ACT_SITE 108; /note="Charge relay system"; /evidence="ECO:0000250|UniProtKB:P15367"