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. Author manuscript; available in PMC: 2019 May 1.
Published in final edited form as: J Struct Biol. 2017 Dec 26;202(2):105–112. doi: 10.1016/j.jsb.2017.12.009

Figure 3.

Figure 3

SpoIIIAB shares a similar fold to homologous protein form Type II secretion system and Type IV pilus. (A) Structural overlay of SpoIIIAB27-153 with EpsF56-171, TcpE1-102 and PilC53-168 proteins in blue, orange, yellow and green, respectively (PDB codes: 3C1Q, 2WHN and 4HHX, respectively). Two SpoIIIAB27-153 regions display structural variation and are marked by black arrows; helix 6 angle and the increasing dimensions of helices 4-5 and the loop connecting them. The structures overlay is shown in three views, related by a 90° rotation. (B) Multiple sequence alignment of SpoIIIAB27-153 protein and the structural homologs, residues are numbered according to SpoIIIAB. Top and bottom secondary structures are presented according to SpoIIIAB27-153 and EpsF56-171 crystal structures, respectively.