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Identification of a temperature-resistant bacteriophage phi X174 mutant
K Kadowaki1, T Shibata, K Takeuchi
1Department of Agricultural Chemistry, Kyoto University, Japan.
The Journal of General Virology
|September 1, 1987
Summary
A high temperature-resistant mutant bacteriophage (phi X174am3trD) showed 10,000 times greater stability than its parent (phi X174am3). Mutations in gene G altered protein structure, enhancing thermal resistance.
Area of Science:
- Virology
- Molecular Biology
- Biochemistry
Background:
- Bacteriophages are viruses that infect bacteria.
- Bacteriophage phi X174am3 is a well-studied model organism.
- Understanding phage stability is crucial for biotechnological applications.
Purpose of the Study:
- To investigate the genetic basis of high temperature resistance in bacteriophage phi X174am3trD.
- To elucidate the structural changes in gene G protein responsible for enhanced thermal stability.
Main Methods:
- Comparative survival assays after heat treatment.
- Bacteriophage complementation tests.
- Gene sequencing and protein secondary structure analysis.
Main Results:
- Bacteriophage phi X174am3trD exhibited 10^4-fold higher stability than phi X174am3 at 54°C.
- Complementation tests implicated gene G in temperature resistance.
- Sequence analysis revealed mutations in gene G leading to amino acid changes and altered secondary structure (beta-turn to alpha-helix).
Conclusions:
- Temperature resistance of phi X174am3trD is linked to mutations in gene G.
- Structural alterations in the gene G protein, potentially increasing hydrophobicity or protein interactions, confer thermal stability.