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The biosynthesis of oncovirus proteins
Biochimica Et Biophysica Acta
|April 6, 1978
Summary
Oncovirus protein synthesis shows similarities between avian and mammalian viruses. Key viral proteins, including structural, reverse transcriptase, and envelope proteins, are synthesized as precursors and processed into mature forms.
Area of Science:
- Molecular Biology
- Virology
- Biochemistry
Background:
- Oncoviruses utilize complex protein biosynthesis pathways.
- Understanding these pathways is crucial for deciphering viral replication and oncogenesis.
Purpose of the Study:
- To elucidate the biosynthesis patterns of oncoviral proteins in avian and mammalian systems.
- To compare the synthesis and processing of gag, pol, env, and src gene products.
Main Methods:
- Analysis of protein precursor synthesis via genome-sized and sub-genomic mRNA.
- Investigating the post-translational modification and cleavage of viral polyproteins.
- Characterizing the translation products of gag, pol, env, and src genes.
Main Results:
- Four major internal structural proteins (gag) and viral reverse transcriptase (pol) are synthesized as precursors from genome-sized mRNA.
- Envelope proteins (env) are translated from sub-genomic RNA as a glycosylated precursor, processed at the plasma membrane.
- The transformation-associated protein (src) is translated from a distinct viral mRNA, with its characterization remaining incomplete.
Conclusions:
- Oncovirus protein biosynthesis is conserved across avian and mammalian species.
- Precursor polyprotein processing is a key mechanism for generating functional viral proteins.
- Further research is needed to fully characterize the src protein and cleavage mechanisms.