title: A method of determining RNA conformational ensembles using structure-based calculations of residual dipolar couplings.
abstract: We describe a method of determining the conformational fluctuations of RNA based on the incorporation of nuclear magnetic resonance (NMR) residual dipolar couplings (RDCs) as replica-averaged structural restraints in molecular dynamics simulations. In this approach, the alignment tensor required to calculate the RDCs corresponding to a given conformation is estimated from its shape, and multiple replicas of the RNA molecule are simulated simultaneously to reproduce in silico the ensemble-averaging procedure performed in the NMR measurements. We provide initial evidence that with this approach it is possible to determine accurately structural ensembles representing the conformational fluctuations of RNA by applying the reference ensemble test to the trans-activation response element of the human immunodeficiency virus type 1.
authors.affiliation: Department of Chemistry, University of Cambridge, Cambridge, United Kingdom.
authors.forename: Aditi N
authors.initials: AN
authors.lastname: Borkar
authors.forename: Alfonso
authors.initials: A
authors.lastname: De Simone
authors.forename: Rinaldo W
authors.initials: RW
authors.lastname: Montalvao
authors.forename: Michele
authors.initials: M
authors.lastname: Vendruscolo
mesh_terms: D056004:Molecular Dynamics Simulation; D019906:Nuclear Magnetic Resonance, Biomolecular; D009690:Nucleic Acid Conformation; D012313:RNA / Q000737:chemistry*
chemical_list: D012313:RNA