##gff-version 3 A4G9I7 UniProtKB Chain 1 265 . . . ID=PRO_1000063212;Note=1-(5-phosphoribosyl)-5-[(5-phosphoribosylamino)methylideneamino] imidazole-4-carboxamide isomerase A4G9I7 UniProtKB Active site 8 8 . . . Note=Proton acceptor;Ontology_term=ECO:0000255;evidence=ECO:0000255|HAMAP-Rule:MF_01014 A4G9I7 UniProtKB Active site 139 139 . . . Note=Proton donor;Ontology_term=ECO:0000255;evidence=ECO:0000255|HAMAP-Rule:MF_01014