From: Cathepsin B/X is secreted by Echinometra lucunter sea urchin spines, a structure rich in granular cells and toxins
Substrate
KM(μM)
kcat(s-1)
kcat/KM(mM.s)-1
Z-R-MCA
147.2 ± 40.0
7.46 ± 0.60
51 ± 4
Abz-GIVR↓AK(Dnp)-OH
(63%)1
8.57 ± 0.51
0.29 ± 0.01
34 ± 2
Abz-GIVRA↓K(Dnp)-OH
(37%)
Abz-GIVRAKQ-EDDnp
ND2
ND