##gff-version 3 Q89MB9 UniProtKB Chain 1 1254 . . . ID=PRO_0000231658;Note=Vitamin B12-dependent ribonucleotide reductase Q89MB9 UniProtKB Active site 474 474 . . . Note=Proton acceptor;Ontology_term=ECO:0000250;evidence=ECO:0000250 Q89MB9 UniProtKB Active site 476 476 . . . Note=Cysteine radical intermediate;Ontology_term=ECO:0000250;evidence=ECO:0000250 Q89MB9 UniProtKB Active site 478 478 . . . Note=Proton acceptor;Ontology_term=ECO:0000250;evidence=ECO:0000250 Q89MB9 UniProtKB Binding site 153 153 . . . Ontology_term=ECO:0000250;evidence=ECO:0000250 Q89MB9 UniProtKB Binding site 198 199 . . . Ontology_term=ECO:0000250;evidence=ECO:0000250 Q89MB9 UniProtKB Binding site 230 230 . . . Ontology_term=ECO:0000250;evidence=ECO:0000250 Q89MB9 UniProtKB Binding site 474 478 . . . Ontology_term=ECO:0000250;evidence=ECO:0000250 Q89MB9 UniProtKB Binding site 675 679 . . . Ontology_term=ECO:0000250;evidence=ECO:0000250 Q89MB9 UniProtKB Disulfide bond 199 487 . . . Note=Redox-active;Ontology_term=ECO:0000250;evidence=ECO:0000250