Histone-DNA contacts changing as a function of the number of unwrapped bps at one DNA end during stage 2.

<p>(a) H2Aa-DNA end2 contacts. (b) H2Ba-DNA end2 contacts. Plotted are the contact probabilities of each residue in the conformational ensemble. Contact is counted if at least one pair of atoms in the histone and DNA is within 4 Å of each other. (c) Close-up view of the H2Aa-DNA end2 interface. Residues 16 to 32 and 75 to 77 are shown as stick models. H2A and H2B are shown as cartoon models and are colored yellow and red, respectively. (d) Close-up view of the H2Ba-DNA end2 interface. The DNA and residues 36 to 43 are shown as space filling and stick models, respectively. H2A and H2B are shown as cartoon models and are colored yellow and red, respectively.