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. Author manuscript; available in PMC: 2015 Aug 5.
Published in final edited form as: Biochemistry. 2015 Jun 24;54(26):4050–4062. doi: 10.1021/acs.biochem.5b00414

Figure 8.

Figure 8

Four dimer models showing possible helix-turn-helix arrangements to form a dimer. Each helix is shown as a rectangle with the hydrophobic face color coded in green and the hydrophilic face exposed to solution in red. In models A and B, two monomers interact through hydrophilic surfaces in an anti-parallel and a parallel face-to-back manner, respectively. The face-to-back implies the top surface of a monomer is interacting with the back surface of another monomer. In models C and D, two monomers are stacked on top of each other, and interact through hydrophobic surfaces in the middle of the helix-turn-helix monomers.