- PDB-6riu: C-terminal domain of TssA protein from T6SS of Vibrio cholerae. -
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Basic information
Entry
Database: PDB / ID: 6riu
Title
C-terminal domain of TssA protein from T6SS of Vibrio cholerae.
Components
Type VI secretion system protein TssA
Keywords
TRANSPORT PROTEIN / T6SS / Vibrio / TssA / cap
Function / homology
Type VI secretion system-associated, VCA0119 / Type VI secretion, EvfE, EvfF, ImpA, BimE, VC_A0119, VasJ / ImpA, N-terminal / ImpA, N-terminal, type VI secretion system / Type VI secretion system protein TssA / ImpA_N domain-containing protein
Function and homology information
Biological species
Vibrio cholerae (bacteria)
Method
ELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.9 Å
Journal: EMBO J / Year: 2019 Title: Diverse roles of TssA-like proteins in the assembly of bacterial type VI secretion systems. Authors: Johannes Paul Schneider / Sergey Nazarov / Ricardo Adaixo / Martina Liuzzo / Peter David Ringel / Henning Stahlberg / Marek Basler / Abstract: Protein translocation by the bacterial type VI secretion system (T6SS) is driven by a rapid contraction of a sheath assembled around a tube with associated effectors. Here, we show that TssA-like or ...Protein translocation by the bacterial type VI secretion system (T6SS) is driven by a rapid contraction of a sheath assembled around a tube with associated effectors. Here, we show that TssA-like or TagA-like proteins with a conserved N-terminal domain and varying C-terminal domains can be grouped into at least three distinct classes based on their role in sheath assembly. The proteins of the first class increase speed and frequency of sheath assembly and form a stable dodecamer at the distal end of a polymerizing sheath. The proteins of the second class localize to the cell membrane and block sheath polymerization upon extension across the cell. This prevents excessive sheath polymerization and bending, which may result in sheath destabilization and detachment from its membrane anchor and thus result in failed secretion. The third class of these proteins localizes to the baseplate and is required for initiation of sheath assembly. Our work shows that while various proteins share a conserved N-terminal domain, their roles in T6SS biogenesis are fundamentally different.
EMPIAR-10271 (Title: Cryo electron microscopy of TssA protein from T6SS of Vibrio cholerae. Data size: 1.3 TB Data #1: Frame-averaged micrographs of TssA protein from T6SS of Vibrio cholerae [micrographs - single frame] Data #2: Aligned multi-frame micrographs of TssA protein from T6SS of Vibrio cholerae [micrographs - multiframe])
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