1EKD

NMR AND MOLECULAR MODELING REVEAL THAT DIFFERENT HYDROGEN BONDING PATTERNS ARE POSSIBLE FOR GU PAIRS: ONE HYDROGEN BOND FOR EACH GU PAIR IN R(GGCGUGCC)2 AND TWO FOR EACH GU PAIR IN R(GAGUGCUC)2

Summary for 1EKD

• Entry DOI: 10.2210/pdb1ekd/pdb
• Descriptor: RNA (5'-R(*GP*GP*CP*GP*UP*GP*CP*C)-3') (1 entity in total)
• Functional Keywords: rna, gu pair, hydrogen bond, double helix
• Total number of polymer chains: 2
• Total formula weight: 5115.15

Authors

Chen, X.,McDowell, J.A.,Kierzek, R.,Krugh, T.R.,Turner, D.H. (deposition date: 2000-03-07, release date: 2000-11-13, Last modification date: 2024-05-22)

Primary citation

Chen, X.,McDowell, J.A.,Kierzek, R.,Krugh, T.R.,Turner, D.H.
Nuclear magnetic resonance spectroscopy and molecular modeling reveal that different hydrogen bonding patterns are possible for G.U pairs: one hydrogen bond for each G.U pair in r(GGCGUGCC)(2) and two for each G.U pair in r(GAGUGCUC)(2).
Biochemistry, 39:8970-8982, 2000

PubMed Abstract: G.U pairs occur frequently and have many important biological functions. The stability of symmetric tandem G.U motifs depends both on the adjacent Watson-Crick base pairs, e.g., 5'G > 5'C, and the sequence of the G.U pairs, i.e., 5'-UG-3' > 5'-GU-3', where an underline represents a nucleotide in a G.U pair [Wu, M., McDowell, J. A., and Turner, D. H. (1995) Biochemistry 34, 3204-3211]. In particular, at 37 degrees C, the motif 5'-CGUG-3' is less stable by approximately 3 kcal/mol compared with other symmetric tandem G.U motifs with G-C as adjacent pairs: 5'-GGUC-3', 5'-GUGC-3', and 5'-CUGG-3'. The solution structures of r(GAGUGCUC)(2) and r(GGCGUGCC)(2) duplexes have been determined by NMR and restrained simulated annealing. The global geometry of both duplexes is close to A-form, with some distortions localized in the tandem G.U pair region. The striking discovery is that in r(GGCGUGCC)(2) each G.U pair apparently has only one hydrogen bond instead of the two expected for a canonical wobble pair. In the one-hydrogen-bond model, the distance between GO6 and UH3 is too far to form a hydrogen bond. In addition, the temperature dependence of the imino proton resonances is also consistent with the different number of hydrogen bonds in the G.U pair. To test the NMR models, U or G in various G.U pairs were individually replaced by N3-methyluridine or isoguanosine, respectively, thus eliminating the possibility of hydrogen bonding between GO6 and UH3. The results of thermal melting studies on duplexes with these substitutions support the NMR models.

PubMed: 10913310
DOI: 10.1021/bi992938e

Experimental method

SOLUTION NMR