##gff-version 3 A3N3W4 UniProtKB Chain 1 250 . . . ID=PRO_0000319467;Note=1-(5-phosphoribosyl)-5-[(5-phosphoribosylamino)methylideneamino] imidazole-4-carboxamide isomerase A3N3W4 UniProtKB Active site 12 12 . . . Note=Proton acceptor;Ontology_term=ECO:0000255;evidence=ECO:0000255|HAMAP-Rule:MF_01014 A3N3W4 UniProtKB Active site 134 134 . . . Note=Proton donor;Ontology_term=ECO:0000255;evidence=ECO:0000255|HAMAP-Rule:MF_01014