Catalysis of the reaction: 5-carboxyamino-1-(5-phospho-D-ribosyl)imidazole = 5-amino-1-(5-phospho-D-ribosyl)imidazole-4-carboxylate.
Synonyms:
related_synonym:
5-carboxyamino-1-(5-phospho-D-ribosyl)imidazole carboxymutase activity; N5-CAIR mutase activity; N5-carboxyaminoimidazole ribonucleotide mutase activity; PurE; class I PurE