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Isolation of a mutant that changes genomic packaging specificity in phi6
1Department of Microbiology, The Public Health Research Institute, 455 First Avenue, New York, New York, 10016, USA.
Virology
|January 8, 1999
Summary
A bacteriophage phi6 mutant lacking segment S was identified. This virus exhibits altered RNA packaging, suggesting procapsids may adapt to different packaging stages.
Area of Science:
- Virology
- Molecular Biology
- Structural Biology
Background:
- Bacteriophage phi6 possesses a three-segment double-stranded RNA genome within a polyhedral procapsid.
- RNA packaging follows a strict serial dependence: S, then M, then L.
Purpose of the Study:
- Investigate an anomalous bacteriophage phi6 mutant that lost its S segment.
- Characterize the packaging behavior and underlying molecular changes in this mutant.
Main Methods:
- Isolation and characterization of a bacteriophage phi6 mutant.
- Sequencing of gene 1 in segment L to identify mutations.
- In vitro packaging assays using procapsids from mutant cDNA.
Main Results:
- The mutant showed a translational change (arginine to glycine) at position 14 in gene 1 of segment L.
- In vitro packaging revealed procapsids could package S alone, but with reduced efficiency when M and L were present.
- Segments M and L packaging became independent of segment S.
Conclusions:
- The identified mutation in segment L alters procapsid structure and function.
- Mutant procapsids exhibit a modified packaging program, potentially representing an intermediate stage.
- This study provides insights into the flexibility and regulation of bacteriophage RNA packaging.