Fig 1. Crystal structures of.

A. Trigger factor (TF, PDB code: 1W26). The surface of the protein is shown as transparent wire-mesh around the backbone. The surfaces of TF domains are colored differently: N-terminal in blue, Linker in indigo, PPIase domain in red, HA1-linker in yellow, Arm1 in orange, and Arm2 in green; B. Maltose binding protein (MBP, PDB code: 1JW4). The surface of MBP is colored gray, while the structure is colored black. Truncate of MBP’s folding intermediates: C. P2 with a backbone in orange and D. P1 with a backbone in red.