ACT_SITE 194; /note="Charge relay system"; /evidence="ECO:0000250|UniProtKB:W3VKA4"; ACT_SITE 343; /note="Charge relay system"; /evidence="ECO:0000250|UniProtKB:W3VKA4"; ACT_SITE 376; /note="Charge relay system"; /evidence="ECO:0000250|UniProtKB:W3VKA4"