Table I.

K_a for activation of various effectors

No activation is seen in the presence of Rib-1,5-diphosphate, erythrose-4-P, or methyl phosphate using concentrations up to 20 mm.

Activator	Ka	Activitya	Physiological Concentrationb
		%	mm
3-PGA	0.22 ± 0.034	100	1.75
F-6-P	0.4 ± 0.09	70	0.5
G-6-P	2.7 ± 0.79	67	3.23
Glycerophosphate	3.6 ± 0.76	103
PEP	5.0 ± 1.7	37	0.27
Rib-5-P	1.0 ± 0.19	82
6-Phosphogluconic acid	6.0 ± 2.6	14
Suc-6-P	11.9 ± 7.1	50
No activator		10
Pi			6.69

^aRelative activation of AGPase by the indicated metabolite compared to that of activation by 3-PGA.

^bData taken from Liu and Shannon (1981).