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Infectious positive- and negative-strand transcript RNAs from bacteriophage Q beta cDNA clones
P N Shaklee1, J J Miglietta, A C Palmenberg
1Biochemistry Department, University of Wisconsin, Madison 53706.
Virology
|March 1, 1988
Summary
Researchers created infectious Q beta RNA from plasmids. They also expressed the Q beta replicase gene in E. coli, enabling infection by negative-strand Q beta RNA transcripts.
Area of Science:
- Molecular Biology
- Virology
- Genetics
Background:
- Q beta RNA phage is a small RNA virus that infects bacteria.
- Understanding viral RNA replication is crucial for developing antiviral strategies.
Purpose of the Study:
- To construct plasmids encoding the Q beta RNA phage genome for in vitro transcription.
- To express the Q beta replicase gene in Escherichia coli for functional studies.
- To investigate the infectivity of Q beta RNA transcripts in E. coli spheroplasts.
Main Methods:
- Construction of plasmids with full-length Q beta RNA phage cDNA and T7 promoters.
- In vitro transcription using T7 RNA polymerase to generate positive-strand Q beta RNA.
- Subcloning and expression of the Q beta replicase gene in E. coli using a thermoinducible plasmid.
- Transfection of negative-strand Q beta transcripts into E. coli spheroplasts expressing Q beta replicase.
Main Results:
- In vitro transcribed positive-strand Q beta RNA was infectious to E. coli spheroplasts.
- The Q beta replicase gene was successfully expressed in E. coli.
- Full-length negative-strand Q beta transcripts demonstrated infectivity in spheroplasts harboring the induced replicase gene.
Conclusions:
- Plasmids and in vitro transcription provide a method for generating infectious Q beta RNA.
- Expression of the Q beta replicase gene in E. coli facilitates the study of negative-strand RNA replication.
- This system offers a valuable tool for investigating Q beta RNA phage biology and developing potential antiviral therapies.