Fig 1.

Structure of SurA N (blue) and C domain (red) (created from 1M5Y.pdb [14]). (A) Residues mutated in this study are labeled and shown in a ball-and-stick model in green. (B) Residues that are replaced by Cys to introduce a disulfide bond are highlighted: A30-I425 (1), V42-I70 (2), V89-I137 (3), and V146-A410 (4). (C) The same structure as that shown in panel B but rotated 90 degree along a vertical axis. The black oval indicates the location of a three-stranded antiparallel β-sheet formed by two strands from the N terminus and one strand from the C terminus. (D) A zoomed-in view of the β-sheet. Side chains of A30, V37, and I425 are shown in ball-and-stick models.