Two independent type III secretion mechanisms for YopE in Yersinia enterocolitica

Mol Microbiol. 1997 May;24(4):757-65. doi: 10.1046/j.1365-2958.1997.3831750.x.


Pathogenic Yersinia species escape the infected host's defense mechanisms by targeting cytotoxic Yop proteins into the cytoplasm of macrophages via a type III secretion pathway. Two separate secretion signals contained in YopE were identified, each of which were sufficient but not necessary for the secretion of reporter molecules. One signal is located within the coding sequence of the first 15 amino acids and is sufficient for the secretion of fusion proteins but not required for YopE secretion. The second signal is located downstream at residues 15-100 of YopE and is only recognized by the type III machinery when it is bound to SycE. We propose the existence of two independent mechanisms that allow for the secretion of Yop proteins.

Publication types

  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Amino Acid Sequence
  • Bacterial Outer Membrane Proteins / metabolism*
  • Bacterial Proteins / metabolism
  • Bacterial Proteins / physiology
  • Biological Transport
  • Sequence Deletion
  • Structure-Activity Relationship
  • Trans-Activators / metabolism
  • Trans-Activators / physiology
  • Yersinia enterocolitica / pathogenicity*


  • Bacterial Outer Membrane Proteins
  • Bacterial Proteins
  • SycE protein, Yersinia
  • Trans-Activators
  • yopE protein, Yersinia