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บทคัดย่อ: HIV-1 protease is one of the most important drug targets commonly used to against AIDS. However, the emergence of drug resistance remains a significant limitation in the clinical treatment for AIDS. I50V mutation is one of the most significant mutations in HIV-1 protease. Molecular dynamic simulations were performed to investigate the dynamic properties and interaction of wild-type and I50V mutant HIV-1 protease as well as their binding with curcumin which is a substance in turmeric. As the crystallographic structure of the investigated complex was not available, it was built up starting with the crystallographic structure of the wild-type and I50V mutant HIV-1 PR complexed with Amprenavia (PDB entry 3NU5 and 3NU1). The curcumin was, then, introduced into the enzyme pocket using a molecular docking method. The MD simulations were performed for 3.5 ns using AMBER 9.0. From the results, we observed that the curcumin in both systems are flexible and move toward closing the flap region. This behavior generated more free space in the active site, making it possible for a few water molecules to form hydrogen bonds with active site. From RMSD results, the active site of wild-type structure had RMSD value greater than mutant structure, which implied that the mutant protease had higher structural stability than the wild-type protease. In addition, even though the flap opening was found in both systems, the flaps of the mutant open to a much greater degree than what was observed in wild-type protease due to the effect of the mutations and the loss of interactions between protease and curcumin.
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