title: Demonstration of the GC-rich common arm in yeast ribosomal 5.8S RNA via 500-MHz proton nuclear magnetic resonance and Overhauser enhancements.
abstract: In this paper we report the first 1H NMR study of the base-paired secondary structure of yeast 5.8S RNA. On the basis of a combination of homonuclear Overhauser enhancements and temperature dependence of the proton 500-MHz NMR spectrum, we are able to identify and assign eight of the nine base pairs in the most thermally stable helical arm: G116.C137-C117.G136-C118.G135- C119.G134-C120.G133-U121.G132- U122.A131-G123.C130. This arm contains an unusually temperature-stable (to 71 degrees C) segment of four consecutive G.C base pairs. This work constitutes the most direct evidence to date for the existence and base-pair sequence of the GC-rich helix, which is common to most currently popular secondary structural models for eukaryotic 5.8S ribosomal RNA.
mesh_terms: D001482:Base Composition; D001483:Base Sequence; D003596:Cytosine; D006147:Guanine; D009682:Magnetic Resonance Spectroscopy / Q000379:methods; D009690:Nucleic Acid Conformation; D012335:RNA, Ribosomal; D012441:Saccharomyces cerevisiae / Q000032:analysis*
chemical_list: D012335:RNA, Ribosomal; D006147:Guanine; D003596:Cytosine