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Structure of the dodecameric Yersinia enterocolitica secretin YscC and its trypsin-resistant core.
Type of publication
Peer-reviewed
Publikationsform
Original article (peer-reviewed)
Publication date
2013
Author
Kowal Julia, Chami Mohamed, Ringler Philippe, Müller Shirley A, Kudryashev Mikhail, Castaño-Díez Daniel, Amstutz Marlise, Cornelis Guy R, Stahlberg Henning, Engel Andreas,
Project
Software for Electron Microscopy of Membrane Proteins
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Original article (peer-reviewed)
Journal
Structure (London, England : 1993)
Volume (Issue)
21(12)
Page(s)
2152 - 61
Title of proceedings
Structure (London, England : 1993)
DOI
10.1016/j.str.2013.09.012
Abstract
The type III secretion system machinery, also known as the injectisome, delivers bacterial effector proteins into eukaryotic cells during infection. The outer membrane YscC secretin is a major part of Yersinia enterocolitica's injectisome and is among the first components to assemble, solely assisted by its pilotin, YscW. We have determined the three-dimensional structures of the native complex and its protease-resistant core to 12 Å resolution by cryo-electron microscopy (cryo-EM) and show that YscC forms a dodecameric complex. Cryo-EM of YscC reconstituted into proteoliposomes defines the secretin's membrane-spanning region. Native YscC consists of an outer membrane ring connected via a thin cylindrical wall to a conical, periplasmic region that exposes N-terminal petals connected by flexible linkers. These petals harbor the binding site of YscD, a component of the inner membrane ring. A change in their orientation adapts the length of the YscC secretin and facilitates its interaction with YscD.
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