title: Differential binding of Mg2+, Zn2+, and Cd2+ at two sites in a hammerhead ribozyme motif, determined by 15N NMR.
abstract: A decamer duplex model of Domain II of the hammerhead ribozyme was synthesized with [8-13C-1,7,NH2-15N3]-guanosine at the known metal binding site, G10.1 and, for comparison, [2-13C-1,7,NH2-15N3]-guanosine at G16.2. The 15N NMR chemical shifts of the labeled N7s monitored during addition of Mg2+, Cd2+, and Zn2+ showed the same preference for binding at G10.1 over G16.2 for each metal. These results demonstrate that 15N labeling can be used to evaluate the binding of different metals, including Mg2+, to a given nitrogen, as well as to compare the binding potential of different sites.
authors.affiliation: Department of Chemistry and Chemical Biology, 610 Taylor Road, Rutgers, The State University of New Jersey, Piscataway, New Jersey 08854, USA.
authors.forename: Gang
authors.initials: G
authors.lastname: Wang
authors.forename: Barbara L
authors.initials: BL
authors.lastname: Gaffney
authors.forename: Roger A
authors.initials: RA
authors.lastname: Jones
mesh_terms: D001665:Binding Sites; D002104:Cadmium / Q000737:chemistry / Q000378:metabolism; D002413:Cations, Divalent / Q000737:chemistry / Q000378:metabolism; D008274:Magnesium / Q000737:chemistry / Q000378:metabolism; D008670:Metals / Q000737:chemistry* / Q000378:metabolism; D009587:Nitrogen Isotopes; D019906:Nuclear Magnetic Resonance, Biomolecular / Q000379:methods; D016337:RNA, Catalytic / Q000737:chemistry* / Q000378:metabolism; D015032:Zinc / Q000737:chemistry / Q000378:metabolism
chemical_list: D002413:Cations, Divalent; D008670:Metals; D009587:Nitrogen Isotopes; D016337:RNA, Catalytic; C427204:hammerhead ribozyme; D002104:Cadmium; D008274:Magnesium; D015032:Zinc