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Literature summary for 3.5.4.16 extracted from
- 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 (2005), J. Biochem., 138, 263-275.
Cloned(Commentary)
| Cloned (Comment) | Organism |
|---|---|
| enzyme expression in Escherichia coli strain BL21(DE3) | Thermus thermophilus |
Crystallization (Commentary)
| Crystallization (Comment) | Organism |
|---|---|
| purified enzyme complexed with 8-oxo-GTP or 8-oxo-dGTP, and as free enzyme, hanging drop vapour diffusion method, 20°C, 0.002 ml of 13.7 mg/ml protein is mixed with 0.002 ml reservoir solution containing 0.1 M HEPES, pH 6.8, 2.0 M ammonium sulfate, 3.4% PEG 400, and 15% glycerol, X-ray diffraction structure determination and analysis at 2.0 and 1.8 A or at 2.2. A resolution, respectively | Thermus thermophilus |
Inhibitors
| Inhibitors | Comment | Organism | Structure |
|---|---|---|---|
| 8-oxo-dGTP | competitive inhibition | Thermus thermophilus |  |
| 8-oxo-GTP | competitive inhibition, binds tightly to the enzyme with higher affinity than GTP, structure and binding network, overview | Thermus thermophilus | |
| ATP | competitive inhibition | Thermus thermophilus | |
| dGTP | competitive inhibition | Thermus thermophilus | |
KM Value [mM]
| KM Value [mM] | KM Value Maximum [mM] | Substrate | Comment | Organism | Structure |
|---|---|---|---|---|---|
| additional information | - |
additional information | steady-state kinetics | Thermus thermophilus | |
| 0.0042 | - |
GTP | pH 8.5, 25°C, recombinant enzyme | Thermus thermophilus | |
| 0.0143 | - |
GDP | pH 8.5, 25°C, recombinant enzyme | Thermus thermophilus | |
Metals/Ions
| Metals/Ions | Comment | Organism | Structure |
|---|---|---|---|
| Zn2+ | the zinc ion is bound by residues Cys108, His111, and Cys179 | Thermus thermophilus | |
Natural Substrates/ Products (Substrates)
| Natural Substrates | Organism | Comment (Nat. Sub.) | Natural Products | Comment (Nat. Pro.) | Rev. | Reac. |
|---|---|---|---|---|---|---|
| GTP + H2O | Thermus thermophilus | - |
formate + 2-amino-4-hydroxy-6-(erythro-1,2,3-trihydroxypropyl)-dihydropteridine triphosphate | - |
? | |
| GTP + H2O | Thermus thermophilus HB8 / ATCC 27634 / DSM 579 | - |
formate + 2-amino-4-hydroxy-6-(erythro-1,2,3-trihydroxypropyl)-dihydropteridine triphosphate | - |
? | |
Organism
| Organism | UniProt | Comment | Textmining |
|---|---|---|---|
| Thermus thermophilus | Q5SH52 | - |
- |
| Thermus thermophilus HB8 / ATCC 27634 / DSM 579 | Q5SH52 | - |
- |
Purification (Commentary)
| Purification (Comment) | Organism |
|---|---|
| recombinant enzyme from Escherichia coli strain BL21(DE3) by ion exchange chromatography | Thermus thermophilus |
Reaction
| Reaction | Comment | Organism | Reaction ID |
|---|---|---|---|
| GTP + H2O = formate + 7,8-dihydroneopterin 3'-triphosphate | substrate binding and reaction mechanism, transition state structure, modelling, overview | Thermus thermophilus |
Substrates and Products (Substrate)
| Substrates | Comment Substrates | Organism | Products | Comment (Products) | Rev. | Reac. |
|---|---|---|---|---|---|---|
| GDP + H2O | - |
Thermus thermophilus | formate + 2-amino-4-hydroxy-6-(erythro-1,2,3-trihydroxypropyl)-dihydropteridine diphosphate | i.e. dihydroneopterin 3'-triphosphate | ? | |
| GDP + H2O | - |
Thermus thermophilus HB8 / ATCC 27634 / DSM 579 | formate + 2-amino-4-hydroxy-6-(erythro-1,2,3-trihydroxypropyl)-dihydropteridine diphosphate | i.e. dihydroneopterin 3'-triphosphate | ? | |
| GTP + H2O | - |
Thermus thermophilus | formate + 2-amino-4-hydroxy-6-(erythro-1,2,3-trihydroxypropyl)-dihydropteridine triphosphate | - |
? | |
| GTP + H2O | - |
Thermus thermophilus | formate + 2-amino-4-hydroxy-6-(erythro-1,2,3-trihydroxypropyl)-dihydropteridine triphosphate | i.e. dihydroneopterin 3'-triphosphate | ? | |
| GTP + H2O | - |
Thermus thermophilus HB8 / ATCC 27634 / DSM 579 | formate + 2-amino-4-hydroxy-6-(erythro-1,2,3-trihydroxypropyl)-dihydropteridine triphosphate | - |
? | |
| GTP + H2O | - |
Thermus thermophilus HB8 / ATCC 27634 / DSM 579 | formate + 2-amino-4-hydroxy-6-(erythro-1,2,3-trihydroxypropyl)-dihydropteridine triphosphate | i.e. dihydroneopterin 3'-triphosphate | ? | |
Synonyms
| Synonyms | Comment | Organism |
|---|---|---|
| GTPCH1 | - |
Thermus thermophilus |
Temperature Optimum [°C]
| Temperature Optimum [°C] | Temperature Optimum Maximum [°C] | Comment | Organism |
|---|---|---|---|
| 25 | - |
assay at | Thermus thermophilus |
Turnover Number [1/s]
| Turnover Number Minimum [1/s] | Turnover Number Maximum [1/s] | Substrate | Comment | Organism | Structure |
|---|---|---|---|---|---|
| 0.0017 | - |
GDP | pH 8.5, 25°C, recombinant enzyme | Thermus thermophilus | |
| 0.0035 | - |
GTP | pH 8.5, 25°C, recombinant enzyme | Thermus thermophilus | |
pH Optimum
| pH Optimum Minimum | pH Optimum Maximum | Comment | Organism |
|---|---|---|---|
| 8.5 | - |
assay at | Thermus thermophilus |
Ki Value [mM]
| Ki Value [mM] | Ki Value maximum [mM] | Inhibitor | Comment | Organism | Structure |
|---|---|---|---|---|---|
| additional information | - |
additional information | inhibition kinetics | Thermus thermophilus | |
| 0.0000054 | - |
8-oxo-GTP | pH 8.5, 25°C, recombinant enzyme | Thermus thermophilus | |
| 0.00022 | - |
8-oxo-dGTP | pH 8.5, 25°C, recombinant enzyme | Thermus thermophilus | |
| 0.02 | - |
dGTP | pH 8.5, 25°C, recombinant enzyme | Thermus thermophilus | |
| 0.071 | - |
ATP | pH 8.5, 25°C, recombinant enzyme | Thermus thermophilus | |
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