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. 1993 Nov 25;21(23):5418–5424. doi: 10.1093/nar/21.23.5418

NMR studies of G:A mismatches in oligodeoxyribonucleotide duplexes modelled after ribozymes.

M Katahira 1, H Sato 1, K Mishima 1, S Uesugi 1, S Fujii 1
PMCID: PMC310580  PMID: 8265358

Abstract

The structures of two oligodeoxyribonucleotide duplexes, the base sequences of which were modelled after both a hammerhead ribozyme and a small metalloribozyme, were studied by NMR. Both duplexes contain adjacent G:A mismatches; one has a PyGAPu:PyGAPu sequence and the other a PyGAPy:PuGAPu sequence. It is concluded on the basis of many characteristic NOEs that in both duplexes G:A base pairs are formed in the unique 'sheared' form, where an amino proton instead of an imino proton of G is involved in the hydrogen bonding, and G and A bases are arranged 'side by side' instead of 'head to head'. A photo-CIDNP experiment, which gives unique and independent information on the solvent accessibility of nucleotide bases, also supports G:A base pairing rather than a bulged-out structure of G and A residues. This is the first demonstration that not only the PyGAPu:PyGAPu sequence but also the PyGAPy:PuGAPu sequence can form the unique sheared G:A base pairs. Taking the previous studies on G:A mismatches into account, the idea is suggested that a PyGA:GAPu sequence is a minimum and essential element for the formation of the sheared G:A base pairs. The sheared G:A base pairs in the PyGAPu:PyGAPu sequence are suggested to be more stable than those in the PyGAPy:PuGAPu sequence. This is explained rationally by the idea proposed above.

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Selected References

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