Crystal structure and function of 5-formaminoimidazole-4-carboxamide ribonucleotide synthetase from Methanocaldococcus jannaschii.
Zhang, Y., White, R.H., Ealick, S.E.(2008) Biochemistry 47: 205-217
- PubMed: 18069798 
- DOI: 10.1021/bi701406g
- Primary Citation of Related Structures:  
2R7K, 2R7L, 2R7M, 2R7N, 2R84, 2R85, 2R86, 2R87 - PubMed Abstract: 
Purine biosynthesis requires 10 enzymatic steps in higher organisms, while prokaryotes require an additional enzyme for step 6. In most organisms steps 9 and 10 are catalyzed by the purH gene product, a bifunctional enzyme with both 5-formaminoimidazole-4-carboxamide ribonucleotide (FAICAR) synthase and inosine monophosphate (IMP) cyclohydrolase activity ...