Crosscorrelation plots for angles between tetranucleotide and pentanucleotide fragments. Crosscorrelation values for the angles between global helix axes fitted to backbone C1' atoms of successive, non-overlapping tetranucleotide fragments, and the angles between global helix axes fitted to backbone C1' atoms of successive, non-overlapping pentanucleotide fragments, for the five structures with PDB id's 1KX4, 2NZD, 2F8N, 1KX3 and 1P3I, corresponding to sequences 1, 2, 3, 4 and 5, with respect to the corresponding parameters for the best resolved crystal structrure of the nucleosome with PDB id 1KX5, corresponding to sequence 6. For the purpose of calculation, the value of the angle was assigned to the 4th/5th position in the octanucleotide/decanucleotide. The angles are assigned the sign of their dot product with the average of vectors in the x-directions of the two central basepairs.
Marathe and Bansal BMC Structural Biology 2011 11:1 doi:10.1186/1472-6807-11-1