TABLE 3.

Effect of protease inhibitors on PoS1 activity

Inhibitor (concn)	Residual activity (%)
HgCl2 (1 mM)	93
FeCl3 (1 mM)	100
CuSO4 (1 mM)	77
EDTA (1 mM)	100
o-Phenanthroline (1 mM)	100
p-Hydroxymercuribenzoate (1 mM)	100
p-Chloromercuribenzoate (1 mM)	100
E-64 (0.1 mM)	93
Chimostatin (0.1 mM)	17
Antipain (1 mM)	2
Pepstatin A (1 mM)	100
DCIa (0.5 mM)	6
PMSF (1 mM)	1
APMSFb (1 mM)	6
Aprotinin (1 mM)	54

^aDCI, 3,4-dichloroisocoumarin. 

^bAPMSF, 4-amidinophenyl-methanesulfonyl fluoride.