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Bacteriophage P2: genes involved in baseplate assembly
E Haggård-Ljungquist1, E Jacobsen, S Rishovd
1Department of Genetics, University of Stockholm, Sweden.
Virology
|October 20, 1995
Summary
Researchers sequenced essential tail genes (V, J, W, I) of bacteriophage P2, revealing their order and functions. Gene V mutations impact P4 phage production, with P4 sid mutations offering partial compensation.
Area of Science:
- Molecular Biology
- Virology
- Genetics
Background:
- The temperate bacteriophage P2 is a model organism for studying viral structure and replication.
- Understanding bacteriophage tail genes is crucial for deciphering infection mechanisms and phage assembly.
- Previous studies had identified V and J tail genes, but the roles of other essential tail genes remained unclear.
Purpose of the Study:
- To determine the sequences of two new essential tail genes (W and I) in bacteriophage P2.
- To elucidate the genetic organization and functional roles of bacteriophage P2 tail genes.
- To investigate the interaction between bacteriophage P2 tail gene mutations and satellite phage P4 production.
Main Methods:
- DNA sequencing to determine the nucleotide sequences of P2 tail genes.
- Genetic analysis of temperature-sensitive mutations in P2 genes.
- Phenotypic analysis of P2 and P4 phage interactions under different conditions.
Main Results:
- The nucleotide sequences of essential tail genes V, J, W, and I of bacteriophage P2 were determined.
- The determined gene order is: late gene promoter, VWJI, followed by tail fiber genes H and G, and a transcription terminator.
- The V gene product forms the tail tip spike, and the J gene product is located at the baseplate edge. The W gene product shows potential homology to T4 phage gene 25.
- A temperature-sensitive mutation in P2 gene V significantly impairs P4 satellite phage production, more so than P2 helper phage production.
- Compensatory mutations in the P4 capsid size determination gene (sid) were identified in P4 phages grown on P2 V mutants.
Conclusions:
- The study successfully identified and sequenced novel essential tail genes (W and I) of bacteriophage P2, expanding the understanding of its genome.
- The findings provide insights into the structural organization of the bacteriophage P2 tail, identifying specific gene products and their locations.
- The genetic interaction between P2 gene V and P4 sid mutations highlights a complex interplay in phage assembly and replication, offering avenues for future research.