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Morphology and physical properties of Staphylococcus bacteriophage P11-M15
Abstract:
The Group B Staphylococcus phage P11-M15 is shown to be 51% protein and 49% deoxyribonucleic acid (DNA). The intact virion has a molecular weight of 66.7 x 10(6) daltons. The purified viral DNA has a molecular weight of 32.7 x 10(6) daltons. The intact virion is shown to be composed of a polyhedral head which is attached at one of its vertices to a flexible tail having helical symmetry. The tail structure is terminated by a complex baseplate which has sixfold symmetry. The virion contains a single molecule of double-stranded DNA which has no apparent single-strand nicks or single-stranded terminal redundancies.
Insights
Group B Staphylococcus phage P11-M15 is 51% protein and 49% DNA. Structural analysis reveals a polyhedral head, helical tail, and baseplate, with a single double-stranded DNA molecule inside.
Area of Science:
- Microbiology
- Molecular Biology
- Structural Biology
Background:
- Bacteriophages are viruses that infect bacteria.
- Staphylococcus species are significant human pathogens.
- Understanding phage structure is crucial for phage therapy and genetic research.
Purpose of the Study:
- To characterize the composition and structure of Group B Staphylococcus phage P11-M15.
- To determine the molecular weight of the intact virion and its DNA.
- To elucidate the morphological features of the phage particle.
Main Methods:
- Biochemical analysis to determine the protein and deoxyribonucleic acid (DNA) content.
- Molecular weight determination of the intact virion and purified viral DNA.
- Electron microscopy or similar techniques to visualize and analyze virion morphology.
Main Results:
- The phage P11-M15 is composed of 51% protein and 49% DNA.
- The intact virion has a molecular weight of 66.7 x 10^6 daltons.
- The viral DNA has a molecular weight of 32.7 x 10^6 daltons and is a single molecule of double-stranded DNA without apparent nicks or terminal redundancies.
- The virion exhibits a polyhedral head, a flexible tail with helical symmetry, and a baseplate with sixfold symmetry.
Conclusions:
- Phage P11-M15 possesses a complex and well-defined structure.
- The characterized DNA molecule is suitable for further genetic studies.
- This structural and compositional data provides a foundation for understanding phage-host interactions and potential applications.