Figure 4.
Overall structure of the Y75A and H83A mutants that is very similar to that of wt HasAp (PDB entry 3ELL). The Cα root-mean-square deviations (rmsds) from comparing the wild-type structure (A) to the structure of Y75A HasAp (B) is 0.571 Å, and that from comparing the wild-type structure to the structure of H83Amono HasAp (C) is 0.448 Å. Secondary structures are colored cyan (α-helices), magenta (β-strands), and gray (loops). Residues Ser2–Ala183 were used to calculate the rmsds using the secondary structure matching algorithm in Superpose58 via the CCP4 interface.59