Journal of Microbiology

The Microbiological Society of Korea (한국미생물학회)
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Isolation and Characterization of the Smallest Bacteriophage P4 Derivatives Packaged into P4-Size Head in Bacteriophage P2-P4 System

  • Kim, Kyoung-Jin (Department of Life Science, College of Natural Sciences, Sunmoon University) ;
  • Song, Jae-Ho (Department of Life Science, College of Natural Sciences, Sunmoon University)
  • Published : 2006.10.31
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Abstract

Bacteriophage P4, a satellite phage of coliphage P2, is a very useful experimental tool for the study of viral capsid assembly and cos-cleavage. For an in vitro cos-cleavage reaction study of the P2-P4 system, new shortened and selectable markers containing P4 derivative plasm ids were designed as a substrate molecules. They were constructed by swapping the non-essential segment of P4 DNA for either the kanamycin resistance (kmr) gene or the ampicillin resistance (apr) gene. The size of the genomes of the resulting markers were 82% (P4 ash8 delRI:: kmr) and 79% (P4 ash8 delRI:: apr) of the wild type P4 genome. To determine the lower limit of genome size that could be packaged into the small P4-size bead, these shortened P4 plasmids were converted to phage particles with infection of the helper phage P2. The conversion of plasmid P4 derivatives to bacteriophage particles was verified by the heat stability test and the burst size determination experiment. CsCl buoyant equilibrium density gradient experiments confirmed not only the genome size of the viable phage form of shortened P4 derivatives, but also their packaging into the small P4-size head. P4 ash8 delRI:: apr turned out to be the smallest P4 genome that can be packaged into P4-sized head.

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References

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