Abstract
CP-T1 is the only described generalized transducing bacteriophage for the intestinal pathogen Vibrio cholerae, yet many of its basic biological parameters remain unknown. Due to low frequencies of transduction and pseudolysogen formation, CP-T1 has not been widely used as a genetic tool. To overcome these limitations, we have isolated a conditional mutant of CP-T1 that exhibits temperature-sensitive plaque formation. Several biological properties of CP-T1ts were determined, including its restrictive temperature, adsorbance profile to host cells, burst time, and burst size. Based on these properties, an optimized transduction protocol was designed which resulted in several fold higher transduction frequencies for a variety of genetic markers from a number of chromosomal loci. Generalized transduction was also demonstrated between classical and E1 Tor biotype strains of V. cholerae.
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