EC Number   |
Reaction |
Reference |
|---|
    6.3.5.5 | 2 ATP + L-glutamine + hydrogencarbonate + H2O = 2 ADP + phosphate + L-glutamate + carbamoyl phosphate |
An ordered uni bi mechanism for glutamine hydrolysis that is consistent with the isotope effects and with the catalytic properties of the enzyme is proposed |
649994 |
| 6.3.5.5 | 2 ATP + L-glutamine + hydrogencarbonate + H2O = 2 ADP + phosphate + L-glutamate + carbamoyl phosphate |
carbamate, the product of the reaction involving ATP, bicarbonate, and ammonia, must be delivered from the site of formation to the site of utilization by traveling nearly 40 A within the enzyme. The tunnel is composed of three continuous water pockets and two narrow connecting parts, near residues A23 and G575. The two narrow parts render two free energy barriers of 6.7 and 8.4 kcal/mol, respectively. Three water pockets are filled with about 21, 9, and 9 waters, respectively, and the corresponding relative free energies of carbamate residing in these free energy minima are 5.8, 0, and 1.6 kcal/mol, respectively. The release of phosphate into solution at the site for the formation of carbamate allows the side chain of R306 to rotate toward E25, E383, and E604. This rotation is virtually prohibited by a barrier of at least 23 kcal/mol when phosphate remains bound. This conformational change not only opens the entrance of the tunnel but also shields the charge-charge repulsion from the three glutamate residues when carbamate passes through the tunnel |
715279 |
| 6.3.5.5 | 2 ATP + L-glutamine + hydrogencarbonate + H2O = 2 ADP + phosphate + L-glutamate + carbamoyl phosphate |
catalytic mechanism |
650110 |
| 6.3.5.5 | 2 ATP + L-glutamine + hydrogencarbonate + H2O = 2 ADP + phosphate + L-glutamate + carbamoyl phosphate |
effects of pressure on the partial reactions, study of the function of monomers of enzyme domains under conditions of pressure-induced dissociation |
651882 |
| 6.3.5.5 | 2 ATP + L-glutamine + hydrogencarbonate + H2O = 2 ADP + phosphate + L-glutamate + carbamoyl phosphate |
four partial reaction occurs at three active sites connected by a molecular tunnel of 100 Angstrom, reaction mechanism |
649986 |
| 6.3.5.5 | 2 ATP + L-glutamine + hydrogencarbonate + H2O = 2 ADP + phosphate + L-glutamate + carbamoyl phosphate |
in glutamine utilizing enzymes, the hydrolysis of glutamine to yield ammonia is catalyzed at a triad-type glutamine amidotransferase domain |
652351 |
| 6.3.5.5 | 2 ATP + L-glutamine + hydrogencarbonate + H2O = 2 ADP + phosphate + L-glutamate + carbamoyl phosphate |
mechanism |
650798, 652028 |
| 6.3.5.5 | 2 ATP + L-glutamine + hydrogencarbonate + H2O = 2 ADP + phosphate + L-glutamate + carbamoyl phosphate |
mechanism for the generation of ammonia within the L-glutamine amidotransferase domain of CPS, detailed overview |
695002 |
| 6.3.5.5 | 2 ATP + L-glutamine + hydrogencarbonate + H2O = 2 ADP + phosphate + L-glutamate + carbamoyl phosphate |
mechanism involves at least three steps, the first of which is an ATP-dependent formation of enzyme-bound activated carbon dioxide |
-, 1744 |
| 6.3.5.5 | 2 ATP + L-glutamine + hydrogencarbonate + H2O = 2 ADP + phosphate + L-glutamate + carbamoyl phosphate |
mechanism, formation of enzyme-bound carboxy phosphate |
1725 |
