Novel Reaction Mechanism of GTP Cyclohydrolase I. High-Resolution X-Ray Crystallography of Thermus thermophilus HB8 Enzyme Complexed with a Transition State Analogue, the 8-Oxoguanine Derivative.
Tanaka, Y., Nakagawa, N., Kuramitsu, S., Yokoyama, S., Masui, R.(2005) J Biochem 138: 263-275
- PubMed: 16169877 
- DOI: 10.1093/jb/mvi120
- Primary Citation of Related Structures:  
1WM9, 1WUQ, 1WUR - PubMed Abstract: 
GTP cyclohydrolase I (GTPCH1) catalyzes the conversion of GTP to dihydroneopterin 3'-triphosphate. We found that an 8-oxoguanine derivative of GTP (8-oxo-GTP) strongly bound to GTPCH1 from Thermus thermophilus HB8 (tGTPCH1) as a competitive inhibitor. The affinity of 8-oxo-GTP was three orders of magnitude greater than that of GTP ...