Table 3.

PsANR reaction kinetics using cyanidin, pelargonidin or delphinidin as a substrate

Substrate	K m (μM)	V max (nmol mg −1  min −1 )	k cat (sec −1 )	k cat /K m (M −1  sec −1 )
Pelargonidin	39.0 ± 0.1a	72.5 ± 2.2a	1.2 × 10−3	30.7
Cyanidin	37.0 ± 0.2	30.2 ± 5.0	0.5 × 10−3	13.5
Delphinidin	183.6 ± 0.2	47.3 ± 6.4	0.8 × 10−3	4.3

^aData are means ± SE (n = 3).