Compare between watson-crick and hoogsteen base pair
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Where the N3 position of thymine normally hydrogen bonds to the N1 position in adenine, in Hoogsteen pairing the N7 of adenine is bonded to the N3 of thymine. ... This type of pairing can lead to a triplex DNA oligonucleotide structure, with the Hoogsteen base pairs in the major groove of the Watson-Crick duplex structure.
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A Twist To DNA Base Pairing. Adenine (A) pairs with thymine (T) using Watson-Crick hydrogen bonds 99% of the time (left). But adenine can flip to formHoogsteen hydrogen bonds (right) 1% of the time. Guanine and cytosine base pairs undergo a similar transition.
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