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. 2016 Jul 11;6:29422. doi: 10.1038/srep29422

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Copyright © 2016, Macmillan Publishers Limited

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(A) At low concentrations, Sso10a1 bends DNA by binding in cis. Increased concentrations lead to dimer-dimer interactions, which bridge two DNA segments. (B) At low concentrations, Sso10a2 bends DNA by binding in cis, similar to Sso10a1. At increased protein concentrations adjacent dimers exhibit electrostatic dimer-dimer interactions via the wing, which results in protein-DNA filaments. (C) Sso10a2 crystal structure showing possible electrostatic interactions between adjacent dimers (PDB 4WH0). Residues K57 (magenta) and E59 (grey) within the wing domain of the dimer can form electrostatic dimer-dimer interactions when bound side-by-side along the DNA.