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In vitro translation yields a possible Rous sarcoma virus src gene product
Summary
Researchers translated Rous sarcoma virus (RSV) RNA in vitro, identifying novel viral proteins. These RSV-specific proteins, distinct from known viral components, likely originate from the RSV src gene.
Area of Science:
- Molecular Biology
- Virology
- Gene Expression
Background:
- Rous sarcoma virus (RSV) is a retrovirus known to cause tumors in chickens.
- Understanding the viral gene products is crucial for deciphering viral oncogenesis.
Purpose of the Study:
- To identify and characterize novel viral proteins synthesized from Rous sarcoma virus (RSV) virion RNA.
- To determine the genetic origin of these newly identified RSV proteins.
Main Methods:
- In vitro translation of RSV virion RNA using a messenger-dependent reticulocyte lysate system.
- Analysis of synthesized polypeptides using sodium dodecyl sulfate/polyacrylamide gel electrophoresis (SDS-PAGE).
- Tryptic peptide mapping to assess protein relatedness and identification of RNA templates for specific proteins.
Main Results:
- Two distinct RSV-specific polypeptides (approximately 25,000 and 17,000 daltons) were synthesized, absent in transformation-defective RSV mutants.
- These proteins were translated from a polyadenylylated RNA of ~2500 nucleotides, distinct from the full viral genome RNA (38S).
- Tryptic peptide analysis indicated the 25,000 and 17,000 dalton proteins are related to each other but not to the 76,000-dalton precursor protein.
Conclusions:
- The 25,000 and 17,000 dalton proteins are likely products of the RSV src gene.
- These findings contribute to understanding the genetic basis of RSV-induced transformation.