TABLE 2.

Effects of chemical agents on the activity of purified (615.1-fold) X-PDP

Chemical agent	Relative activitya
	0.1 mM	1.0 mM
EDTA	104	101
o-Phenanthroline	104	103
Dithiothreitol	106	105
2-Mercaptoethanol	103	102
Iodoacetate	107	89
E-64	91	112
Pepstatin A	100	113
Amastatin	96	100
Bestatin	93	98
Puromycin	89	94
Phenylmethylsulfonyl fluoride	90	57
3,4-Dichloroisocoumarin	0	0

^aExpressed as a percentage of that obtained in the absence of any added chemical agent, which was given a value of 100%, corresponding to 0.014 U (μmol · h⁻¹).