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Control of membrane morphogenesis in bacteriophage PM2
Journal of Supramolecular Structure
|January 1, 1976
Summary
Bacteriophage PM2 mutants reveal that viral membrane formation does not require DNA or coat protein scaffolding. This finding offers insights into membrane biogenesis in both viruses and eukaryotic cells.
Area of Science:
- Virology
- Molecular Biology
- Cell Biology
Background:
- Bacteriophage PM2 membrane formation provides a model for eukaryotic membrane dynamics.
- Wild-type virions mature at the inner face of the Pseudomonas host cytoplasmic membrane before lysis.
Purpose of the Study:
- To characterize two temperature-sensitive mutants of bacteriophage PM2.
- To investigate the roles of DNA and capsid protein in viral membrane formation.
Main Methods:
- Analysis of temperature-sensitive mutants (ts 1 and ts 5) of bacteriophage PM2.
- Observation of viral morphology and membrane vesicle formation in infected Pseudomonas cells at restrictive and permissive temperatures.
- Biochemical analysis of viral capsid protein pelleting with membranes.
Main Results:
- Mutant ts 1 produced abundant, empty virus-size membrane vesicles and reduced DNA synthesis at restrictive temperatures.
- Mutant ts 5 showed defective capsid protein association with membranes and produced virus-size membrane vesicles.
- The formation of correctly sized viral membranes was observed even without DNA encapsulation or complete coat protein scaffolding.
Conclusions:
- Viral membrane formation can occur independently of a DNA core.
- The assembly of viral membranes does not necessitate outer coat protein scaffolding.
- These findings contribute to understanding fundamental principles of membrane biogenesis.