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TitleBiogenesis and structure of a type VI secretion baseplate.
Journal, issue, pagesNat Microbiol, Vol. 3, Issue 12, Page 1404-1416, Year 2018
Publish dateOct 15, 2018
AuthorsYassine Cherrak / Chiara Rapisarda / Riccardo Pellarin / Guillaume Bouvier / Benjamin Bardiaux / Fabrice Allain / Christian Malosse / Martial Rey / Julia Chamot-Rooke / Eric Cascales / Rémi Fronzes / Eric Durand /
PubMed AbstractTo support their growth in a competitive environment and cause pathogenesis, bacteria have evolved a broad repertoire of macromolecular machineries to deliver specific effectors and toxins. Among ...To support their growth in a competitive environment and cause pathogenesis, bacteria have evolved a broad repertoire of macromolecular machineries to deliver specific effectors and toxins. Among these multiprotein complexes, the type VI secretion system (T6SS) is a contractile nanomachine that targets both prokaryotic and eukaryotic cells. The T6SS comprises two functional subcomplexes: a bacteriophage-related tail structure anchored to the cell envelope by a membrane complex. As in other contractile injection systems, the tail is composed of an inner tube wrapped by a sheath and built on the baseplate. In the T6SS, the baseplate is not only the tail assembly platform, but also docks the tail to the membrane complex and hence serves as an evolutionary adaptor. Here we define the biogenesis pathway and report the cryo-electron microscopy (cryo-EM) structure of the wedge protein complex of the T6SS from enteroaggregative Escherichia coli (EAEC). Using an integrative approach, we unveil the molecular architecture of the whole T6SS baseplate and its interaction with the tail sheath, offering detailed insights into its biogenesis and function. We discuss architectural and mechanistic similarities but also reveal key differences with the T4 phage and Mu phage baseplates.
External linksNat Microbiol / PubMed:30323254
MethodsEM (single particle)
Resolution4.3 - 4.7 Å
Structure data

0008

6giy

EMDB-0008, PDB-6giy:
The baseplate complex from the type VI secretion system
Method: EM (single particle) / Resolution: 4.3 Å

0009

6gj1

EMDB-0009, PDB-6gj1:
The baseplate complex from the type VI secretion system
Method: EM (single particle) / Resolution: 4.7 Å

0010

6gj3

EMDB-0010, PDB-6gj3:
The baseplate complex from the type VI secretion system
Method: EM (single particle) / Resolution: 4.3 Å

Source
  • escherichia coli (E. coli)
KeywordsSTRUCTURAL PROTEIN / Secretion / baseplate / complex

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