Nucleic Acids Research, 2000, Vol. 28, No. 9 1929-1934
© 2000 Oxford University Press
Thermodynamic parameters for DNA sequences with dangling ends
Department of Chemistry, Wayne State University, Detroit, MI 48202, USA
The thermodynamic contributions to duplex formation of all 32 possible single-nucleotide dangling ends on a WatsonCrick pair are reported. In most instances, dangling ends are stabilizing with free energy contributions ranging from +0.48 (
) to 0.96 kcal/mol (
). In comparison, WatsonCrick nearest-neighbor increments range from 0.58 (TA/AT) to 2.24 (GC/CG) kcal/mol. Hence, in some cases, a dangling end contributes as much to duplex stability as a WatsonCrick A-T base pair. The implications of these results for DNA probe design are discussed. Analysis of the sequence dependence of dangling-end stabilities show that the nature of the closing base pair largely determines the stabilization. For a given closing base pair, however, adenine dangling ends are always more or equally as stable as the other dangling nucleotides. Moreover, 5' dangling ends are more or equally as stabilizing as their 3' counterparts. Comparison of DNA with RNA dangling-end motifs shows that DNA motifs with 5' dangling ends contribute to stability equally or more than their RNA counterparts. Conversely, RNA 3' dangling ends contribute to stability equally or more than their DNA counterparts. This data set has been incorporated into a DNA secondary structure prediction algorithm (DNA MFOLD) (http://mfold2.wustl.edu/~mfold/dna/form1.cgi ) as well as a DNA hybridization prediction algorithm (HYT HERTM) (http://jsl1.chem.wayne.edu/Hyther/hythermenu.html ).
* To whom correspondence should be addressed. Tel: +1 313 577 0101; Fax: +1 313 577 8822; Email: jsl@chem.wayne.edu
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