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Structure and free energy profiles of the R1617 spectrin domain. (A) structure of R1617 (PDB ID: 1CUN). Each domain consists of three helices A, B, and C. Shown are F(x, y) (B), F0(x, y) (C), and U(x, y) (D) for ε/kBT = 0.6. Structural order parameters qi(x, y) for each residue are (x, y) = (80, 40) (Ei), (x, y) = (102, 40) (Eii), (x, y) = (102, 75) (Eiii), and (x, y) = (102, 85) (Eiv).
