5uy8

Structural highlights

Disease

PUR9_HUMAN Defects in ATIC are the cause of AICAR transformylase/IMP cyclohydrolase deficiency (AICAR) [MIM:608688. A neurologically devastating inborn error of purine biosynthesis. Patients excrete massive amounts of AICA-riboside in the urine and accumulate AICA-ribotide and its derivatives in erythrocytes and fibroblasts. AICAR causes profound mental retardation, epilepsy, dysmorphic features and congenital blindness.^{[1] [2]}

Function

PUR9_HUMAN Bifunctional enzyme that catalyzes 2 steps in purine biosynthesis.^[3]

See Also

• Bifunctional purine biosynthesis protein PURH

References

1. ↑ Cheong CG, Wolan DW, Greasley SE, Horton PA, Beardsley GP, Wilson IA. Crystal structures of human bifunctional enzyme aminoimidazole-4-carboxamide ribonucleotide transformylase/IMP cyclohydrolase in complex with potent sulfonyl-containing antifolates. J Biol Chem. 2004 Apr 23;279(17):18034-45. Epub 2004 Feb 13. PMID:14966129 doi:10.1074/jbc.M313691200
2. ↑ Marie S, Heron B, Bitoun P, Timmerman T, Van Den Berghe G, Vincent MF. AICA-ribosiduria: a novel, neurologically devastating inborn error of purine biosynthesis caused by mutation of ATIC. Am J Hum Genet. 2004 Jun;74(6):1276-81. Epub 2004 Apr 26. PMID:15114530 doi:10.1086/421475
3. ↑ Cheong CG, Wolan DW, Greasley SE, Horton PA, Beardsley GP, Wilson IA. Crystal structures of human bifunctional enzyme aminoimidazole-4-carboxamide ribonucleotide transformylase/IMP cyclohydrolase in complex with potent sulfonyl-containing antifolates. J Biol Chem. 2004 Apr 23;279(17):18034-45. Epub 2004 Feb 13. PMID:14966129 doi:10.1074/jbc.M313691200