#bdna

In B-DNA, base pairs are stacked one on top of another, with a spacing of 0.34 nm and 10 base pairs per nm helical repeat.

Figure 25.11b shows more detail of a B-DNA double helix, especially the major and minor grooves. (...) Another of the most common secondary structures of DNA is A-DNA (figure 25.11a), which forms under conditions of high salt concentration and minimal water and is also a right-handed helix. Z-DNA (figure 25.11c) is a conformation variation, which has a left-handed double helix.

Figure 25.10 shows a ribbon model of double-stranded B-DNA, the predominant form of DNA in dilute aqueous solution and thought to be the most common form in nature. (...) This displacement and the relative orientation of the glycosidic bonds linking each base to the sugar-phosphate backbone lead to two different sized grooves: a major groove and a minor groove (figure 25.10).

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