Conjugative Pili of Plasmids in Escherichia coli K-12 and Pseudomonas Species

  • David E. Bradley


There are three basic morphological forms of conjugative pili for plasmids transferable to Escherichia coli K-12: thin flexible, thick flexible, and rigid. Plasmids determining rigid pili transfer at least 2000X more efficiently on a solid surface compared with in a liquid. The majority of such plasmids are naturally derepressefor transfer and pilus synthesis. The following Pseudomonas plasmids determine rigid pili: Rmsl48 (IncP-7), TOL (IncP-9), and R91.5 (IncP-10). Several new plasmid-specific bacteriophages have been found to adsorb to the sides or tips of conjugative pili.


Nalidixic Acid Incompatibility Group Serological Relationship Immune Electron Microscopy Rigid Pilus 
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Copyright information

© Springer Science+Business Media New York 1981

Authors and Affiliations

  • David E. Bradley
    • 1
  1. 1.Faculty of Medicine Memorial University of NewfoundlandSt. John’s, NewfoundlandCanada

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