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- W2053695683 abstract "In addition to the canonical base-pairs comprising the standard Watson–Crick (C:G and U:A) and wobble U:G conformations, an analysis of the base-pair types and conformations in the rRNAs in the high-resolution crystal structures of the Thermus thermophilus 30 S and Haloarcula marismortui 50 S ribosomal subunits has identified a wide variety of non-canonical base-pair types and conformations. However, the existing nomenclatures do not describe all of the observed non-canonical conformations or describe them with some ambiguity. Thus, a standardized system is required to classify all of these non-canonical conformations appropriately. Here, we propose a new, simple and systematic nomenclature that unambiguously classifies base-pair conformations occurring in base-pairs, base-triples and base-quadruples that are associated with secondary and tertiary interactions. This system is based on the topological arrangement of the two bases and glycosidic bonds in a given base-pair. Base-pairs in the internal positions of regular secondary structure helices usually form with canonical base-pair groups (C:G, U:A, and U:G) and canonical conformations (C:G WC, U:A WC, and U:G Wb). In contrast, non-helical base-pairs outside of regular structure helices usually have non-canonical base-pair groups and conformations. In addition, many non-helical base-pairs are involved in RNA motifs that form a defined set of non-canonical conformations. Thus, each rare non-canonical conformation may be functionally and structurally important. Finally, the topology-based isostericity of base-pair conformations can rationalize base-pair exchanges in the evolution of RNA molecules." @default.
- W2053695683 created "2016-06-24" @default.
- W2053695683 creator A5000884496 @default.
- W2053695683 creator A5014867905 @default.
- W2053695683 date "2004-12-01" @default.
- W2053695683 modified "2023-10-12" @default.
- W2053695683 title "Diversity of Base-pair Conformations and their Occurrence in rRNA Structure and RNA Structural Motifs" @default.
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- W2053695683 doi "https://doi.org/10.1016/j.jmb.2004.09.072" @default.
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