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Probing Essential Nucleobase Functional Groups in Aptamers and
Probing Essential Nucleobase Functional Groups in Aptamers and

... minor groove interaction with G22, critically depending on the presence of the N2 amino group of G22. Accordingly, a G22I mutation is detrimental to ligand binding, resulting in the absence of this mutant in the active fraction (i.e., interference value >6). On the other hand, AP is tolerated, since ...
Mossbourne Community Academy A
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AQA Biology: Genetics, populations, evolution
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Nucleic acid double helix



In molecular biology, the term double helix refers to the structure formed by double-stranded molecules of nucleic acids such as DNA. The double helical structure of a nucleic acid complex arises as a consequence of its secondary structure, and is a fundamental component in determining its tertiary structure. The term entered popular culture with the publication in 1968 of The Double Helix: A Personal Account of the Discovery of the Structure of DNA, by James Watson.The DNA double helix polymer of nucleic acids, held together by nucleotides which base pair together. In B-DNA, the most common double helical structure, the double helix is right-handed with about 10–10.5 base pairs per turn. This translates into about 20-21 nucleotides per turn. The double helix structure of DNA contains a major groove and minor groove. In B-DNA the major groove is wider than the minor groove. Given the difference in widths of the major groove and minor groove, many proteins which bind to B-DNA do so through the wider major groove.
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