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A point mutation within the replicase gene differentially affects coronavirus genome versus minigenome replication
Carmen Galán1, Luis Enjuanes, Fernando Almazán
1Department of Molecular and Cell Biology, Centro Nacional de Biotecnología, CSIC, Campus Universidad Autónoma, Cantoblanco. Darwin St. 3, 28049 Madrid, Spain.
Journal of Virology
|November 25, 2005
Summary
Point mutations in the transmissible gastroenteritis virus (TGEV) genome at nucleotide 637 impact virus recovery and minigenome rescue. These mutations affect proteinase cleavage, influencing TGEV replication.
Area of Science:
- Virology
- Molecular Biology
- Genetics
Background:
- Transmissible gastroenteritis virus (TGEV) research often involves genetic manipulation.
- Understanding TGEV replication mechanisms is crucial for disease control.
Purpose of the Study:
- To investigate the functional impact of point mutations at nucleotide 637 in the TGEV genome.
- To elucidate the role of this mutation in virus recovery and minigenome amplification.
Main Methods:
- Reverse genetics using TGEV full-length cDNA clones and minigenomes.
- Sequence analysis of recovered viruses.
- In vitro analysis of proteinase cleavage.
Main Results:
- Mutations at nucleotide 637 (T or A) severely impaired virus recovery from cDNA.
- These mutations were essential for minigenome rescue by helper virus.
- The G-637 to A change affected papain-like proteinase 1 (PLP-1) cleavage in vitro.
- A correlation was observed between predicted cleavage and virus rescue/minigenome amplification.
Conclusions:
- Nucleotide 637 mutations primarily affect TGEV replication at the protein level, specifically impacting PLP-1 function.
- The observed effects on virus recovery and minigenome rescue are linked to altered proteinase activity.