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• W2005574417 abstract "The active-site dynamics of human brain aspartoacylase (hASPA) complexed with its substrate (N-acetyl-l-aspartate) has been studied using a hybrid quantum mechanical/molecular mechanical (QM/MM) approach based on the self-consistent charge-density functional tight-binding (SCC-DFTB) model. The Michaelis complex, which is constructed from a recent X-ray structure of the human brain aspartoacylase with a stable tetrahedral intermediate analogue, is reproduced in 1 ns molecular dynamics simulations at 300 K. The simulation shows that the substrate is tightly held in the active site by a hydrogen bond network and the putative nucleophilic water molecule is reasonably close to the nucleophilic center. The catalysis is further modeled with the density functional theory (DFT) in a truncated active-site model at the B3LYP/6-31G(d) level of theory. The DFT calculations indicate the reaction proceeds via a water promoted pathway with Glu178 serving as the general base and general acid. Transition state stabilization for nucleophilic addition is achieved by formations of the weak coordination bond between the substrate carbonyl oxygen atom and the zinc ion as well as of the strong hydrogen bonds between the substrate carbonyl oxygen atom and Arg63." @default.
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• W2005574417 date "2010-06-01" @default.
• W2005574417 modified "2023-10-17" @default.
• W2005574417 title "Molecular dynamics and density functional theory studies of substrate binding and catalysis of human brain aspartoacylase" @default.
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• W2005574417 doi "https://doi.org/10.1016/j.jmgm.2010.02.005" @default.
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