該基因編碼一種雙功能蛋白，對從頭嘌呤生物合成途徑的最后兩個步驟進行催化。N-末端結構域具有磷酸核糖氨基咪唑甲酰胺甲酰轉移酶活性，C-末端結構域具有IMP環水解酶活性。該基因突變導致AICA核糖尿癥。[由RefSeq提供，2009年9月]
This gene encodes a bifunctional protein that catalyzes the last two steps of the de novo purine biosynthetic pathway. The N-terminal domain has phosphoribosylaminoimidazolecarboxamide formyltransferase activity, and the C-terminal domain has IMP cyclohydrolase activity. A mutation in this gene results in AICA-ribosiduria. [provided by RefSeq, Sep 2009]