Figure 4.
Computational Models of the T6SS TssB1C1 Sheath with 12-Fold Symmetry in Both Extended and Contracted Conformations
(A) Ribbon representations of the TssB1C1 sheath in an extended (left) and a contracted (right) conformation. The models are displayed as ribbons with one protofilament each in rainbow colors. The orientation of the sheaths and their dimensions are indicated. Both sheath sizes are arbitrary, each consisting of 30 whole TssB1C1 subunits.
(B) Ribbon representations of the TssB1C1 heterodimer (purple) in the extended (top left) and contracted (top right) conformations of the sheath and the R2 pyocin unit (red; PDB: 3J9Q and 3J9R) in the extended (bottom left) and contracted (bottom right) states of the pyocin sheath. The TssC1 N terminus in the extended model is indicated with dashed lines. Regions undergoing conformational changes from extended to contracted states are indicated with arrows.