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• W2000739851 abstract "The recently published X-ray structure of LeuT, a Na+/Cl−-dependent neurotransmitter transporter, has provided fresh impetus to efforts directed at understanding the molecular principles governing specific neurotransmitter transport. The combination of the LeuT crystal structure with the results of molecular simulations enables the functional data on specific binding and transport to be related to molecular structure. All-atom FEP and molecular dynamics (MD) simulations of LeuT embedded in an explicit membrane were performed alongside a decomposition analysis to dissect the molecular determinants of the substrate specificity of LeuT. It was found that the ligand must be in a zwitterionic (ZW) form to bind tightly to the transporter. The theoretical results on the absolute binding-free energies for leucine, alanine, and glycine show that alanine can be a potent substrate for LeuT, although leucine is preferred, which is consistent with the recent experimental data (Singh et al., Nature 2007;448:952–956). Furthermore, LeuT displays robust specificity for leucine over glycine. Interestingly, the ability of LeuT to discriminate between substrates relies on the dynamics of residues that form its binding pocket (e.g., F253 and Q250) and the charged side chains (R30-D404) from a second coordination shell. The water-mediated R30-D404 salt bridge is thought to be part of the extracellular (EC) gate of LeuT. The introduction of a polar ligand such as glycine to the water-depleted binding pocket of LeuT gives rise to structural rearrangements of the R30-D404-Q250 hydrogen-bonding network and leads to increased hydration of the binding pocket. Conformational changes associated with the broken hydrogen bond between Q250 and R30 are shown to be important for tight and selective ligand binding to LeuT. Proteins 2008. © 2008 Wiley-Liss, Inc." @default.
• W2000739851 created "2016-06-24" @default.
• W2000739851 creator A5029235749 @default.
• W2000739851 date "2008-06-05" @default.
• W2000739851 modified "2023-09-27" @default.
• W2000739851 title "Molecular mechanism of substrate specificity in the bacterial neutral amino acid transporter LeuT" @default.
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• W2000739851 doi "https://doi.org/10.1002/prot.22108" @default.
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