TABLE 2.

Specific activity of GpdQ towards various substrates^a

Substrate	Specific activity (μmol/min/mol of GpdQ)
	pH 5	pH 8
pNPP	9.7 × 102	1.8 × 101
bpNPP	1.5 × 104	1.0 × 104
DMP	2.4 × 102	1.5 × 102
GPE	5.5 × 104	2.6 × 104
Demeton	2.6 × 103	1.2 × 103
Paraoxon	3.1 × 101	1.2 × 102

^aAssays were conducted in 20 mM sodium acetate, pH 5.0, and 20 mM HEPES, pH 8.0, at room temperature.