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Sequence analysis of the respiratory syncytial virus phosphoprotein gene
Abstract:
A recombinant cDNA plasmid (pRSA3) containing an almost full-length copy of the mRNA encoding respiratory syncytial virus phosphoprotein was identified in a cDNA library prepared with mRNA from respiratory syncytial virus-infected cells. The cDNA insert was sequenced, and a protein of 27,150 daltons was deduced from the DNA sequence. The protein is relatively acidic, containing two clusters of acidic amino acids, one in the middle of the molecule and the other at the C-terminus. It is devoid of both cysteine and tryptophan. There was no other potential reading frame within the phosphoprotein gene of respiratory syncytial virus. This situation is unlike that with Sendai virus, a paramyxovirus, which has a nonstructural C protein encoded by a second overlapping reading frame near the 5' end of the mRNA for phosphoprotein.
Insights
Researchers identified a respiratory syncytial virus (RSV) phosphoprotein gene. The deduced protein is acidic, lacks cysteine and tryptophan, and has no overlapping reading frame, unlike Sendai virus.
Area of Science:
- Virology
- Molecular Biology
- Protein Chemistry
Background:
- Respiratory syncytial virus (RSV) is a significant respiratory pathogen.
- Understanding viral gene expression is crucial for developing antivirals.
- The phosphoprotein (P) gene in paramyxoviruses plays a key role in viral replication.
Purpose of the Study:
- To characterize the gene encoding the RSV phosphoprotein.
- To determine the primary structure of the RSV phosphoprotein.
- To compare the RSV phosphoprotein gene organization with other paramyxoviruses.
Main Methods:
- Construction and screening of a cDNA library from RSV-infected cells.
- DNA sequencing of the identified cDNA insert (pRSA3).
- Deduction of the amino acid sequence and analysis of protein properties.
Main Results:
- An almost full-length cDNA copy of the RSV phosphoprotein mRNA was isolated.
- The deduced RSV phosphoprotein has a molecular mass of 27,150 daltons.
- The protein is acidic, contains two acidic clusters, and lacks cysteine and tryptophan.
- No overlapping reading frame was found within the RSV phosphoprotein gene.
Conclusions:
- The RSV phosphoprotein gene encodes a single protein.
- The genetic organization of the RSV phosphoprotein gene differs from that of Sendai virus.
- This finding provides insights into RSV gene expression and potential targets for therapeutic intervention.