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Enhanced conformational sampling of carbohydrates by Hamiltonian replica-exchange simulation.

Authors
  • Mishra, Sushil Kumar
  • Kara, Mahmut
  • Zacharias, Martin
  • Koca, Jaroslav
Type
Published Article
Journal
Glycobiology
Publisher
Oxford University Press
Publication Date
Jan 01, 2014
Volume
24
Issue
1
Pages
70–84
Identifiers
DOI: 10.1093/glycob/cwt093
PMID: 24134878
Source
Medline
Keywords
License
Unknown

Abstract

Knowledge of the structure and conformational flexibility of carbohydrates in an aqueous solvent is important to improving our understanding of how carbohydrates function in biological systems. In this study, we extend a variant of the Hamiltonian replica-exchange molecular dynamics (MD) simulation to improve the conformational sampling of saccharides in an explicit solvent. During the simulations, a biasing potential along the glycosidic-dihedral linkage between the saccharide monomer units in an oligomer is applied at various levels along the replica runs to enable effective transitions between various conformations. One reference replica runs under the control of the original force field. The method was tested on disaccharide structures and further validated on biologically relevant blood group B, Lewis X and Lewis A trisaccharides. The biasing potential-based replica-exchange molecular dynamics (BP-REMD) method provided a significantly improved sampling of relevant conformational states compared with standard continuous MD simulations, with modest computational costs. Thus, the proposed BP-REMD approach adds a new dimension to existing carbohydrate conformational sampling approaches by enhancing conformational sampling in the presence of solvent molecules explicitly at relatively low computational cost.

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