Table 3.

Specific activities in cell extracts with various phosphomonoesters Each reaction mixture contained 10 mM substrate, 25 mM MgCl₂, 0.1% BSA in 100 mM imidazole/HCl (pH 6.5)

Substrates	Activity (unit × 103/mg protein)
	Knock-out strain	Wild-type strain
IMP	0.4	16.6
AMP	1.2	0.7
GMP	0.6	0.5
UMP	0.5	0.4
CMP	0.4	0.3
Phenylphosphate	11.7	11.2
1-Glycerophosphate	106.4	98.8