EC Number   |
Substrates |
Organism |
Products |
Reversibility |
|---|
   2.7.7.45 | 5'-guanylylimidodiphosphate + diphosphate |
- |
Artemia sp. |
GppNHppG + diphosphate |
- |
? |
| 2.7.7.45 | dGTP + dGTP |
- |
Artemia sp. |
P1,P4-bis(5'-(2'-deoxyguanosyl) tetraphosphate + diphosphate |
- |
r |
| 2.7.7.45 | dGTP + dGTP |
96% of the activity with GTP as second substrate |
Artemia sp. |
P1,P4-bis(5'-(2'-deoxyguanosyl) tetraphosphate + diphosphate |
- |
r |
| 2.7.7.45 | GDP + GDP |
rate of the reaction is low compared with synthesis of P1,P4-bis(5'-guanosyl)tetraphosphate and dependent on other small molecular weight components of yolk platelets |
Artemia salina |
P1,P3-bis(5'-guanosyl)triphosphate + diphosphate |
i.e. GP3G |
r |
| 2.7.7.45 | GDP + P1,P4-bis(5'-guanosyl)tetraphosphate |
- |
Artemia salina |
P1,P3-bis(5'-guanosyl)triphosphate |
- |
r |
| 2.7.7.45 | GTP + GTP |
- |
Artemia sp. |
P1,P4-bis(5'-guanosyl)tetraphosphate + diphosphate |
i.e. GP4G |
r |
| 2.7.7.45 | GTP + GTP |
- |
Artemia salina |
P1,P4-bis(5'-guanosyl)tetraphosphate + diphosphate |
i.e. GP4G |
r |
| 2.7.7.45 | GTP + GTP |
- |
Daphnia magna |
P1,P4-bis(5'-guanosyl)tetraphosphate + diphosphate |
i.e. GP4G |
r |
| 2.7.7.45 | GTP + GTP |
- |
Artemia sp. |
P1,P4-bis(5'-guanosyl)tetraphosphate + diphosphate |
certain phosphate analogs can substitute for diphosphate in the reverse reaction |
r |
| 2.7.7.45 | GTP + GTP |
the alpha-phosphorus group of the GMP of the covalent reaction intermediate is linked to the Nepsilon2 ring nitrogen of a histidine residue of the enzyme |
Artemia franciscana |
P1,P4-bis(5'-guanosyl)tetraphosphate + diphosphate |
i.e. GP4G |
r |
