Density functional theory studies of MTSL nitroxide side chain conformations attached to an activation loop

Research output: Contribution to journalArticle

  • Authors:
  • Maria Grazia Concilio (Corresponding)
  • Alistair Fielding (Corresponding)
  • Richard Bayliss
  • Selena G. Burgess


A quantum mechanical (QM) method rooted on density functional theory (DFT) has been employed to determine conformations of the methane-thiosulfonate spin label (MTSL) attached to a fragment extracted from the activation loop of Aurora-A kinase. The features of the calculated energy surface revealed low energy barriers between isoenergetic minima, and the system could be described in a population of 76 rotamers that can be also considered for other systems since it was found that the χ3, χ4 and χ5 do not depend on the previous two dihedral angles. Conformational states obtained were seen to be comparable to those obtained in the α-helix systems studied previously, indicating that the protein backbone does not affect the torsional profiles significantly and suggesting the possibility to use determined conformations for other protein systems for further modelling studies.

Bibliographical metadata

Original languageEnglish
Article number97
JournalTheoretical Chemistry Accounts
Early online date23 Mar 2016
StatePublished - Apr 2016