Question

you have been asked to design a synthetic dna motif, able to bind transcriptional regulatory proteins. the location on this motif that you will design for protein binding is the
multiple choice
phosphate backbone of the dna double helix.
minor groove of the dna double helix.
available hydrogen - bonds of bases in single - stranded dna.
major groove of the dna double helix.
sugar backbone of the dna double helix.

Explanation:

Transcriptional regulatory proteins bind to specific DNA sequences. The major groove of the DNA double - helix provides a more accessible and informative surface for protein - DNA interactions due to the exposed chemical groups of the bases. Proteins can recognize and bind to specific base - pair sequences in the major groove. The phosphate and sugar backbones are less sequence - specific binding sites, and the minor groove has less accessible information for protein recognition compared to the major groove. Single - stranded DNA is not the typical form for these regulatory protein - DNA interactions in the context of double - helix DNA motifs.

Answer:

D. major groove of the DNA double helix