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Thermodynamics of nonsymmetric tandem mismatches adjacent to G.C base pairs in RNA.

The thermodynamic stabilities and structures of a series of RNA duplexes containing nonsymmetric tandem mismatches in the context of , where are tandem mismatches, were studied by UV melting and imino proton NMR. The contribution of one mismatch to the free energy increment for tandem mismatch formation depends on the identity of the other mismatch. Imino proton NMR indicates that this is partly because the structure of a mismatch is dependent on the adjacent mismatch. The results suggest that differences in size, shape, and hydrogen bonding of the adjacent mismatches play important roles in determining loop stability. A model for predicting stabilities of all possible tandem mismatches is proposed based on these and previous results.