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Origin of phospholipid in bacteriophage PM2
Abstract:
Phosphatidylethanolamine is the only phosphatide present in purified bacteriophage PM2 when obtained from bacteria grown and infected in minimal medium. The growth cycle of bacteriophage PM2 shows the basic general features described for virulent bacteriophages. PM2 infection of Pseudomonas BAL-31 causes a pronounced increase in deoxyribonucleic acid synthesis, but no detectable effect on the incorporation of phosphorus into lipid. When (32)P-prelabeled bacteria are infected with PM2, the specific activity of the phosphatide phosphorus in the virus is almost the same as that in the host bacteria labeled before infection. It is concluded that the viral phosphatide is not synthesized de novo after infection, but it probably is derived from preexisting cellular phosphatidylethanolamine.
Insights
Bacteriophage PM2, a virus infecting Pseudomonas BAL-31, utilizes existing phosphatidylethanolamine from its host. This viral lipid is not newly synthesized post-infection, indicating derivation from the host cell.
Area of Science:
- Microbiology
- Virology
- Biochemistry
Background:
- Bacteriophage PM2 is a virus that infects Pseudomonas BAL-31.
- Bacteriophages exhibit general characteristics of virulent viruses during their growth cycle.
- Phosphatidylethanolamine is a key lipid component identified in purified bacteriophage PM2.
Purpose of the Study:
- To investigate the origin of phosphatidylethanolamine in bacteriophage PM2.
- To determine if viral lipids are synthesized de novo or derived from the host cell.
Main Methods:
- Bacterial growth and infection in minimal medium.
- Analysis of bacteriophage PM2 composition.
- Deoxyribonucleic acid synthesis assays.
- Phosphorus incorporation into lipids.
- (32)P-radiolabeling of host bacteria prior to infection.
Main Results:
- Phosphatidylethanolamine was the sole phosphatide found in purified bacteriophage PM2.
- PM2 infection led to increased deoxyribonucleic acid synthesis but no change in lipid phosphorus incorporation.
- The specific activity of phosphatide phosphorus in the virus mirrored that of pre-labeled host bacteria.
Conclusions:
- Bacteriophage PM2 does not synthesize its phosphatide component de novo after infection.
- The viral phosphatidylethanolamine is likely acquired from pre-existing phosphatidylethanolamine in the host bacterium, Pseudomonas BAL-31.