Many Substrates and Functions of Type II Secretion: Lessons Learned From Legionella Pneumophila

Future Microbiol. 2009 Sep;4(7):797-805. doi: 10.2217/fmb.09.53.


Type II secretion is one of six systems that exist in Gram-negative bacteria for the purpose of secreting proteins into the extracellular milieu and/or into host cells. This article will review the various recent studies of Legionella pneumophila that have increased our appreciation of the numbers, types and novelties of proteins that can be secreted via the type II system, as well as the many ways in which type II secretion can promote bacterial physiology, growth, ecology, intracellular infection and virulence. In this context, type II secretion represents a potentially important target for industrial and biomedical applications.

Publication types

  • Research Support, N.I.H., Extramural
  • Review

MeSH terms

  • Bacterial Proteins / metabolism*
  • Humans
  • Legionella pneumophila / metabolism
  • Legionella pneumophila / pathogenicity
  • Legionella pneumophila / physiology*
  • Membrane Transport Proteins / metabolism*
  • Models, Biological
  • Protein Transport
  • Virulence Factors / metabolism*


  • Bacterial Proteins
  • Membrane Transport Proteins
  • Virulence Factors