ACT_SITE 193; /note="Charge relay system"; /evidence="ECO:0000250|UniProtKB:Q96GS6"; ACT_SITE 258; /note="Charge relay system"; /evidence="ECO:0000250|UniProtKB:O75608"; ACT_SITE 287; /note="Charge relay system"; /evidence="ECO:0000250|UniProtKB:O75608"