RNA backbone: consensus all-angle conformers and modular string nomenclature (an RNA Ontology Consortium contribution).

Journal Article (Journal Article)

A consensus classification and nomenclature are defined for RNA backbone structure using all of the backbone torsion angles. By a consensus of several independent analysis methods, 46 discrete conformers are identified as suitably clustered in a quality-filtered, multidimensional dihedral angle distribution. Most of these conformers represent identifiable features or roles within RNA structures. The conformers are given two-character names that reflect the seven-angle delta epsilon zeta alpha beta gamma delta combinations empirically found favorable for the sugar-to-sugar "suite" unit within which the angle correlations are strongest (e.g., 1a for A-form, 5z for the start of S-motifs). Since the half-nucleotides are specified by a number for delta epsilon zeta and a lowercase letter for alpha beta gamma delta, this modular system can also be parsed to describe traditional nucleotide units (e.g., a1) or the dinucleotides (e.g., a1a1) that are especially useful at the level of crystallographic map fitting. This nomenclature can also be written as a string with two-character suite names between the uppercase letters of the base sequence (N1aG1gN1aR1aA1cN1a for a GNRA tetraloop), facilitating bioinformatic comparisons. Cluster means, standard deviations, coordinates, and examples are made available, as well as the Suitename software that assigns suite conformer names and conformer match quality (suiteness) from atomic coordinates. The RNA Ontology Consortium will combine this new backbone system with others that define base pairs, base-stacking, and hydrogen-bond relationships to provide a full description of RNA structural motifs.

Full Text

Duke Authors

Cited Authors

  • Richardson, JS; Schneider, B; Murray, LW; Kapral, GJ; Immormino, RM; Headd, JJ; Richardson, DC; Ham, D; Hershkovits, E; Williams, LD; Keating, KS; Pyle, AM; Micallef, D; Westbrook, J; Berman, HM; RNA Ontology Consortium,

Published Date

  • March 2008

Published In

Volume / Issue

  • 14 / 3

Start / End Page

  • 465 - 481

PubMed ID

  • 18192612

Pubmed Central ID

  • PMC2248255

Electronic International Standard Serial Number (EISSN)

  • 1469-9001

Digital Object Identifier (DOI)

  • 10.1261/rna.657708


  • eng

Conference Location

  • United States