Penambatan Molekuler α, β, dan γ-mangostin Sebagai Inhibitor α-amilase Pankreas Manusia

In silico studies on interactions between the human pancreatic α-amylase (HPA) enzyme with α, β, and γ-mangostin ligands has been carried out using the molecular docking method. Ligands α, β, and γ-mangostin interact through the formation of hydrogen and van der waals bonds with residues on the enzyme active side. The α-mangostin ligands form seven hydrogen and six van der waals bonds with residues involved were Trp59, Gln63, Trp96, Thr163, Thr164, Ala198, His201, Glu233, and Asp300; β-mangostin forms five hydrogen and eight van der waals bonds with residues involved were Gln63, Trp96, Thr163, Thr164, Arg195, Asp197, His201, Glu233, Asp300, and His305; while γ-mangostin forms nine hydrogen and five van der waals bonds with residues involved were Trp59, Gln63, Trp96, Thr163, Asp197, Ala198, His201, Glu233, and Asp300. The binding afinity of α, β, and γ-mangostin to the HPA obtained were -7.0; -6.6; and -7.4 kcal/mol with RMSD value were 1,850; 1,956; and 1,811 Å, respectively. The number of hydrogen bonds that can be formed was responsible to the binding affinity. Ligand γ-mangostin has potential activity as an inhibitor of HPA enzyme due to the stable complexes formation with lower binding affinity (validated with RMSD value) when compared to α and β-mangostin.