Recognition of double helical DNA by alternate strand triple helix formation

Journal Article · Wed Jun 17 00:00:00 EDT 1992 · Journal of the American Chemical Society

DOI:https://doi.org/10.1021/ja00039a004· OSTI ID:284986

Beal, P A; Dervan, P B ^[1]

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1. California Institute of Technology, Pasadena, CA (United States)

The triplet specificities and required strand orientations of two classes of DNA triple helices can be combined to target double helical sequences containing all four base pairs by alternate strand triple helix formation. This allows for the use of oligonucleotides containing only natural 3{prime}-5{prime} phosphodiester linkages to simultaneously bind both strands of double helical DNA in the major groove. The stabilities and structures of these alternate strand triple helices depend on whether the binding site sequences is 5{prime}-(purine){sub m}(pyrimidine){sub n}-3{prime} or 5{prime}-(pyrimidine){sub m}(purine){sub n}-3{prime}. The sequence type 5{prime}-(purine){sub m}- (pyrimidine){sub n}-3{prime} was targeted with an oligonucleotide consisting of a pyrimidine domain and a purine domain linked by a 3{prime}-5{prime} phosphodiester. To bind the duplex sequence type 5{prime}-(pyrimidine){sub m}(purine){sub n}-3{prime}, the third strand requires at least two nucleotides linking binding domains at the site of crossover in the major groove. A new class of oligonucleotides capable of binding mixed duplex sequences by crossovers in the major groove may be possible. 15 refs., 13 figs.

• Sponsoring Organization: USDOE
• OSTI ID: 284986
• Journal Information: Journal of the American Chemical Society, Vol. 114, Issue 13; Other Information: PBD: 17 Jun 1992
• Country of Publication: United States
• Language: English

Related Subjects

55 BIOLOGY AND MEDICINE
BASIC STUDIES
DNA
MOLECULAR STRUCTURE