Fig. 5: Structure of trunk sheaths in pre- and post-contraction states.
From: Atomic structures of a bacteriocin targeting Gram-positive bacteria
Top and side views of diffocin trunks in the pre- (a) and post-contraction states (b). Only four layers, L(n-1)/(n)/(n+1)/(n+2), are shown for simplicity. Sheath proteins are presented as ribbon diagrams and tube proteins are presented as gray surfaces. The inner and outer diameters of sheath rings are labeled on the top views. Ribbon diagrams depicting interactions between neighboring sheaths in the pre- (c) and post-contraction states (d). Four β-strands from three neighboring sheath subunits jointly form the conserved handshake β-sheet. Schematic diagrams for diffocin sheath topology of the extended mesh created by the handshake interaction of augmented β-sheet in the pre- (e) and post-contraction states (f).
