Table 5.

V_max and K_m of CD39CH23CD73 at various pH levels for NTPDase and NMPase activities

CD39CH23CD73	Km, mM	Vmax, µmol Pi/nmol/min
ATPase (pH 7.5)	0.023	2.57
UTPase (pH 7.5)	0.022	4.26
ADPase (pH 7.5)	0.019	1.93
UDPase (pH 7.5)	0.059	4.27
AMPase (pH 7.5)	0.34	8.73
UMPase (pH 7.5)	0.21	7.29
ATPase (pH 5.8)	0.047	1.19
ADPase (pH 5.8)	0.014	0.38
AMPase (pH 5.8)	0.10	3.02