10.1021/ct800152d.s001 Adrian P. Wiley Adrian P. Wiley Sarah L. Williams Sarah L. Williams Jonathan W. Essex Jonathan W. Essex Conformational Motions of HIV-1 Protease Identified Using Reversible Digitally Filtered Molecular Dynamics American Chemical Society 2009 Reversible Digitally protease AIDS Molecular protein flaps HIV RDFMD MD coli dihydrofolate reductase NMR simulation 2009-04-14 00:00:00 Journal contribution https://acs.figshare.com/articles/journal_contribution/Conformational_Motions_of_HIV_1_Protease_Identified_Using_Reversible_Digitally_Filtered_Molecular_Dynamics/2864437 HIV-1 protease performs a vital step in the propagation of the HIV virus and is therefore an important drug target in the treatment of AIDS. It consists of a homodimer, with access to the active site limited by two protein flaps. NMR studies have identified two time scales of motions that occur in these flaps, and it is thought that the slower of these is responsible for a conformational change that makes the protein ligand-accessible. This motion occurs on a time scale outside that achievable using traditional molecular dynamics simulations. Reversible Digitally Filtered Molecular Dynamics (RDFMD) is a method that amplifies low frequency motions associated with conformational change and has recently been applied to, among others, <i>E. coli</i> dihydrofolate reductase, inducing a conformational change between known crystal structures. In this paper, the conformational motions of HIV-1 protease produced during MD and RDFMD simulations are presented, including movement between the known semiopen and closed conformations, and the opening and closing of the protein flaps.