Constructing and evaluating energy surfaces of crystalline disaccharides

Alfred D. French, Anne Marie Kelterer, Glenn P. Johnson, Michael K. Dowd, Christopher J. Cramer

Research output: Contribution to journalArticleResearchpeer-review

Abstract

This paper focuses on the methods used to construct Ramachandran plots for disaccharides. Our recent work based on a hybrid of molecular mechanics and quantum mechanics energies pointed to the need to take extra care when making these maps. Care is also important in the quantitative validation of these energy surfaces with linkage conformations that were determined by crystallography. To successfully predict conformations that have been observed experimentally, the calculation of the energy should include stereo-electronic effects and correctly weight the hydrogen bonding. Technical concerns include the method used to scan the range of conformations, starting geometries, and finding the zero of relative potential energy on a surface where the values were collected at regular intervals. The distributions of observed conformations on energy maps of sucrose, maltose, and laminarabiose at dielectric constants of 1.5 and 7.5 illustrate the effects of an elevated dielectric constant for the MM3 component of the hybrid energy calculations. At dielectric constants of 3.5 and 7.5, the overall average energies of observed conformations of sucrose and seven disaccharides of glucose were less than 1.0 kcal mol-1. The distribution of corresponding energies of the various crystalline conformations conformed well to a Boltzmann-like equation.

Original languageEnglish
Pages (from-to)95-107
Number of pages13
JournalJournal of Molecular Graphics and Modelling
Volume18
Issue number2
DOIs
Publication statusPublished - 2000

Fingerprint

Disaccharides
Interfacial energy
surface energy
Conformations
Crystalline materials
Permittivity
sucrose
Sugar (sucrose)
permittivity
Sucrose
energy
Maltose
Molecular mechanics
Crystallography
Quantum theory
Potential energy
glucose
linkages
crystallography
Glucose

Keywords

  • Carbohydrate
  • Conformation
  • Laminarabiose
  • Maltose
  • Molecular mechanics
  • Quantum mechanics
  • Sucrose
  • Tetrahydropyran
  • Trehalose

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Spectroscopy
  • Atomic and Molecular Physics, and Optics

Cite this

Constructing and evaluating energy surfaces of crystalline disaccharides. / French, Alfred D.; Kelterer, Anne Marie; Johnson, Glenn P.; Dowd, Michael K.; Cramer, Christopher J.

In: Journal of Molecular Graphics and Modelling, Vol. 18, No. 2, 2000, p. 95-107.

Research output: Contribution to journalArticleResearchpeer-review

French, Alfred D. ; Kelterer, Anne Marie ; Johnson, Glenn P. ; Dowd, Michael K. ; Cramer, Christopher J. / Constructing and evaluating energy surfaces of crystalline disaccharides. In: Journal of Molecular Graphics and Modelling. 2000 ; Vol. 18, No. 2. pp. 95-107.
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