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Comparison of avian MC29 and MC31 viral onc proteins
Abstract:
Lysates of [35S]methionine-labelled quail cells transformed by MC31 virus were immunoprecipitated with anti-myc or anti-gag serum and analysed in SDS-PAGE. A protein with a molecular weight 110K was found in both immunoprecipitates. Thus, the product of the MC31 genome is a gag-myc fusion protein with the molecular weight as the product of the MC29 genome. Comparison by tryptic peptide mapping and p15 cleavage analysis showed no differences between both P110 proteins.
Insights
The MC31 virus produces a gag-myc fusion protein of 110K molecular weight. This protein is identical to the product from the MC29 genome, confirmed by peptide mapping and cleavage analysis.
Area of Science:
- Molecular Biology
- Virology
- Protein Chemistry
Background:
- MC31 virus is an avian retrovirus.
- Avian retroviruses can cause cell transformation.
- Understanding viral gene products is crucial for virology research.
Purpose of the Study:
- To characterize the protein product of the MC31 virus genome.
- To compare the MC31 viral protein with that of the MC29 genome.
Main Methods:
- Radioactive labeling of quail cells with [35S]methionine.
- Immunoprecipitation using anti-myc and anti-gag specific sera.
- Analysis of immunoprecipitated proteins by SDS-PAGE.
- Tryptic peptide mapping and p15 cleavage analysis for protein comparison.
Main Results:
- A 110K molecular weight protein was identified in MC31 virus-transformed quail cell lysates.
- This 110K protein was precipitated by both anti-myc and anti-gag sera, indicating a gag-myc fusion.
- The MC31 viral protein was found to be identical to the protein product of the MC29 genome.
- No differences were observed between the P110 proteins from MC31 and MC29 genomes via peptide mapping and cleavage analysis.
Conclusions:
- The MC31 virus genome encodes a gag-myc fusion protein.
- The molecular weight and structure of the MC31 gag-myc fusion protein are identical to those of the MC29 genome product.
- These findings contribute to the understanding of avian retroviral gene expression and protein products.