The dynamics of ligand barrier crossing inside the acetylcholinesterase gorge

Jennifer M. Bui, Richard H. Henchman, J. Andrew McCammon

    Research output: Contribution to journalArticlepeer-review


    The dynamics of ligand movement through the constricted region of the acetylcholinesterase gorge is important in understanding how the ligand gains access to and is released from the active site of the enzyme. Molecular dynamics simulations of the simple ligand, tetramethylammonium, crossing this bottleneck region are conducted using umbrella potential sampling and activated flux techniques. The low potential of mean force obtained is consistent with the fast reaction rate of acetylcholinesterase observed experimentally. From the results of the activated dynamics simulations, local conformational fluctuations of the gorge residues and larger scale collective motions of the protein are found to correlate highly with the ligand crossing.
    Original languageEnglish
    Pages (from-to)2267-2272
    Number of pages5
    Issue number4
    Publication statusPublished - 1 Oct 2003


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