A plant viral "reinitiation" factor interacts with the host translational machinery
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Summary
This summary is machine-generated.Cauliflower mosaic virus transactivator (TAV) enables translation reinitiation on polycistronic RNA. TAV interacts with eukaryotic initiation factor eIF3 and ribosomal subunits, facilitating translation of viral mRNAs.
Area Of Science
- Molecular Biology
- Virology
- Plant Science
Background
- Translation reinitiation is crucial for gene expression from polycistronic mRNAs.
- Cauliflower mosaic virus transactivator (TAV) is known to control this process.
- Understanding TAV's mechanism is key to deciphering viral gene expression strategies.
Purpose Of The Study
- To elucidate the molecular mechanism by which TAV facilitates translation reinitiation.
- To identify the host factors involved in TAV-mediated translation.
- To characterize the interaction of TAV with the host translation machinery.
Main Methods
- In vitro and in vivo biochemical assays to study protein interactions.
- Polysome association studies.
- Transient expression in plant protoplasts.
- Ternary complex formation analysis.
Main Results
- TAV associates with polysomes and eukaryotic initiation factor eIF3.
- TAV physically interacts with eIF3 subunit eIF3g and 60S ribosomal protein L24.
- Expression of eIF3g and L24 impacts TAV-mediated reinitiation.
- Formation of TAV/eIF3/40S and eIF3/TAV/60S ternary complexes was demonstrated.
Conclusions
- TAV recruits eIF3 to polysomes, enabling translation reinitiation on polycistronic RNA.
- This mechanism allows the virus to overcome cellular barriers to translation.
- TAV utilizes host factors eIF3g and L24 to achieve efficient viral gene expression.