Fig. 1. Fluorescence emission spectra of ACE with LKP at different temperatures
(a)—(c): 288, 293, 298 K, c(ACE)= 1.0×10^-6 mol·L^-1

Fig. 2. The Stern-Volmer plots of ACE with LKP

Fig. 3. UV absorption spectra of ACE with LKP at different temperatures
(a)—(c): 288, 293, 298 K,c(ACE)=1.0×10^-6 mol·L^-1,c(LKP)(0—4): 0, 0.28, 1.4, 2.8, 4.2×10^-3 mol·L^-1

Fig. 4. CD spectra of ACE with LKP
298 K, c(ACE)= 1.0×10^-6 mol·L^-1

Fig. 5. The heat flow of binding LKP to ACE
(a)—(c): 288, 293, 298 K, c(ACE)=0.4 μmol·L^-1, c(LKP)=2.8 mmol·L^-1

Fig. 6. The docking simulation of LKP binding to ACE
(a): The docking simulation of LKP binding to ACE;(b): The interaction between LKP and the residues of ACE is shown