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. 1991 Jun 11;19(11):2979–2986. doi: 10.1093/nar/19.11.2979

Duplex stabilities of phosphorothioate, methylphosphonate, and RNA analogs of two DNA 14-mers.

L Kibler-Herzog 1, G Zon 1, B Uznanski 1, G Whittier 1, W D Wilson 1
PMCID: PMC328260  PMID: 1711677

Abstract

The duplex stabilities of various phosphorothioate, methylphosphonate, RNA and 2'-OCH3 RNA analogs of two self-complementary DNA 14-mers are compared. Phosphorothioate and/or methylphosphonate analogs of the two sequences d(TAATTAATTAATTA) [D1] and d(TAGCTAATTAGCTA) [D2] differ in the number, position, or chirality (at the 5' terminal linkage) of the modified phosphates. Phosphorothioate derivatives of D1 are found to be less destabilized when the linkage modified is between adenines rather than between thymines. Surprisingly, no base sequence effect on duplex stabilization is observed for any methylphosphonate derivatives of D1 or D2. Highly modified phosphorothioates or methylphosphonates are less stable than their partially modified counterparts which are less stable than the unmodified parent compounds. The 'normal' (2'-OH) RNA analog of duplex D1 is slightly destabilized, whereas the 2'-OCH3 RNA derivative is significantly stabilized relative to the unmodified DNA. For the D1 sequence, at approximately physiological salt concentration, the order of duplex stability is 2'-OCH3 RNA greater than unmodified DNA greater than 'normal' RNA greater than methylphosphonate DNA greater than phosphorothioate DNA. D2 and the various D2 methylphosphonate analogs investigated all formed hairpin conformations at low salt concentrations.

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Selected References

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