7/24/2019 Some of the Properties of A-Form, B-Form & Z-Form of DNA

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Some of the properties of A-form, B-form & Z-form of DNA.

geometry attribute A-DNA B-DNA Z-DNA

Helix handedness right-handed right-handed left-handed

Diameter 23 (2.3 nm) 20 (2.0 nm) 18 (1.8 nm)

Rotation/bp +33 +36 -30

Mean bp/turn 11 10 12

Vertical rise/bp alongaxis

2.6 (0.26 nm) 3.4 (0.34 nm) 3.7 (0.37 nm)

Glycosyl angle anti antianti for pyrimidine and

syn for purine