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Polypeptide synthesis by extracts from Escherichia coli treated with T2 ghosts
Journal of Virology
|December 1, 1972
Summary
Infection with T2 "ghosts" blocks protein synthesis in Escherichia coli. Viable bacteria extracts showed impaired polypeptide synthesis, indicating a ribosome defect that prevents translation of added RNA templates.
Area of Science:
- Molecular Biology
- Bacteriology
Background:
- Bacteriophage T2 infection can disrupt host cell processes.
- Understanding host-pathogen interactions is crucial in microbiology.
Purpose of the Study:
- To investigate the effects of deoxyribonucleic acid-less T2 "ghosts" on Escherichia coli protein synthesis.
- To identify the specific molecular mechanisms underlying protein synthesis inhibition.
Main Methods:
- Infection of Escherichia coli B with T2 "ghosts" to block protein synthesis.
- Enrichment of viable bacteria using lysozyme treatment and filtration.
- In vitro polypeptide synthesis assays using bacterial extracts and various RNA templates.
Main Results:
- "Ghost extracts" exhibited endogenous amino acid incorporation at half the rate of uninfected bacteria.
- Ghost extracts were unable to synthesize peptides using added template ribonucleic acid (RNA).
- Peptide synthesis with added RNA was only observed at high magnesium ion (Mg2+) concentrations.
Conclusions:
- T2 "ghost" infection likely causes a blockage in bacterial ribosomes during translation.
- The inability of ghost extracts to translate exogenous RNA is attributed to a defect in their ribosomes.