PMID: 40959Nov 1, 1979

Defective F pili and other characteristics of Flac and Hfr Escherichia coli mutants resistant to bacteriophage R17

Journal of Bacteriology
J M BurkeP Fives-Taylor


Mutants resistant to the donor-specific bacteriophage R17 were isolated from Hfr and Flac-containing strains of Escherichia coli K-12. Thirty-five mutants were examined for the presence of F pili by electron microscopy. The pilus morphology was studied, as were the abilities of the cells to retract their pili and to synthesize new pili. Measurements were made of the efficiency of the conjugal deoxyribonucleic acid transfer and of M13 and R17 phage infection. All mutants had noticeable defects in pilus production, structure, or function. Mutants were found which produced unusually long pili, displayed wide variations in the number of pili per cell, and were deficient in pilus retraction and synthesis. Evidence is presented that there may be two pathways of pilus retraction.


May 18, 2012·Molecular Microbiology·Roman P JakobFranz X Schmid
Jun 4, 2014·Molecular Microbiology·Christina M BeckChristopher S Hayes

Related Concepts

Biochemical Pathway
Alkalescens-Dispar Group
Science of Morphology
Pilus Retraction
Electron Microscopy, Diagnostic
Electron Microscopy
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