Structural view of dimerization interfaces.

<p>A) The canonical dimer (blue and green) found in the asymmetric unit. Two dimerization helices (α8, α9 and α8’, α9’) that form four helix bundle at the interface are shown. B) A close-up view of dimerization interface (cartoon) and important residues that make interactions are shown in sticks. The crossing angle between dimerization units is shown below. C) The alternative dimer formed between one monomer of the canonical dimer (molA, cyan) and one monomer of the symmetry mate (mol A', green). D) The dimerization interface of alternative dimer shows alternative dimerization interface is contributed by two DBDs (α1 and α4).