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. 1981 Nov;40(2):551–559. doi: 10.1128/jvi.40.2.551-559.1981

Isolation and characterization of a new bacteriophage, Cp-1, infecting Streptococcus pneumoniae.

C Ronda, R López, E García
PMCID: PMC256658  PMID: 6275103

Abstract

Several pneumococcal phages showing a morphology completely different from those of all other previously found pneumococcal bacteriophages have been isolated. Bacteriophage Cp-1, one of the phages isolated, showed an irregular hexagonal structure and a short tail of 20 nm. The virion density was 1.46 g/cm3. Sodium dodecyl sulfate-polyacrylamide gel electrophoresis revealed the presence of nine polypeptides. The polypeptide showing a molecular weight of 39,000 accounted for more than the 90% of the total protein. The nucleic acid of Cp-1 was linear, double-stranded DNA with a mean length of 6.3 microns and a guanine-plus-cytosine content of 41%; its buoyant density was 1.699 and 1.422 g/cm3 in CsCl and CS2SO4, respectively. Its sedimentation coefficient (S20,w) was 19S. Cp-1 DNA showed a remarkable resistance to a large number of restriction endonucleases. A total of 12 fragments, ranging in molecular weight from 1.3 X 10(6) to 0.09 X 10(6), were produced by AluI, two fragments (molecular weight, 5.5 X 10(6) and 0.9 X 10(6)) were generated by HindIII, and two fragments (molecular weight, 6.0 X 10(6) and 5.7 X 10(6)) were produced by HaeIII. The easy visualization of th plaques produced by Cp-1, the small size of Cp-1 DNA (12 X 10(6) daltons), and other biological and physiochemical properties make this phage potentially useful for genetic studies.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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