How does base-stacking contribute to the structure of DNA?

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Nucleotide base pairs are spaced 3.4 Å apart, which creates a left-handed twist in the double helix and a single groove that is 12 Å wide where DNA-binding proteins can make direct contact with exposed nucleotides.

Nucleotide base pairs are spaced 3.4 Å apart, creating a twist to the double helix and two grooves within the backbone.

Nucleotide base pairs are normally spaced 3.4 Å apart, but base-stacking causes the bases to be more closely packed. This stacking causes the major groove, which is 12 Å wide, to be converted to a minor groove that is only 6 Å wide.

Nucleotide base pairs are spaced 12 Å apart in the major groove and 6 Å apart in the minor groove, creating a twist to the double helix.

 

asked May 13, 2013 in Genetics by GeneX ~Top Expert~ (7,947 points)
    

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Nucleotide base pairs are spaced 3.4 Å apart, creating a twist to the double helix and two grooves within the backbone.
answered May 13, 2013 by GeneX ~Top Expert~ (7,947 points)



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