The inhibition of fructose 1,6-bisphosphatase by fructose 2,6-bisphosphate is enhanced by EDTA and diminished by zinc(II) |
| |
| Authors: | M J Costas J C Cameselle |
| |
| Institution: | Departamento de Bioquímica y Biología Molecular y Genética, Facultad de Medicina, Universidad de Extremadura, Badajoz, Spain. |
| |
| Abstract: | The sensitivity of the Mg(II)-dependent activity of rabbit liver fructose 1,6-bisphosphatase (FBPase, EC 3.1.3.11) to inhibition by fructose 2,6-bisphosphate (Fru-2,6-P2) was enhanced by EDTA and diminished to negligible levels by 0.5-2 microM Zn(II) added as another FBPase inhibitor. Fru-2,6-P2 was more efficient in the presence of the synergistic effector AMP: still, the Fru-2,6-P2 concentration inhibiting 50% changed from 3 microM (with EDTA) to higher than 50 microM (with Zn(II]. On the other hand, the Zn(II)-dependent FBPase activity was inhibited by Fru-2,6-P2 to a much lesser extent than the Mg(II)-dependent activity. |
| |
| Keywords: | |
|
|
