Secondary structure
In addition to its primary structure, DNA can be described in terms of its secondary structure.
The Secondary structure of DNA describes the parameters of the double stranded macromolecule as a whole. See Image Gallery (Images 1-4)
For B-DNA (Classic or Watson-Crick DNA) Secondary Structure includes such features as:
Strands:
Two strands
Plectonemically coiled (twisted around each other, in helical form)
Antiparallel (one 5' to 3'; the other 3' to 5')
Backbone:
Smooth backbone line
No irregular features
Backbone on the outside, base-pairs on the inside
Bases:
Bases paired (A-T, G-C)
Base-pairs flat, planar
10 bases per turn
The Double Helix:
Right-handed helix (clockwise)
Symmetrical
Z-DNA
For ligands, go to Z-DNA page
left-handed helix (counterclockwise)
backbone zigs and zags
12 bases per turn
bases turned and flipped
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