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E1a revisited: the case for multiple cooperative trans-activation domains.
A W Braithwaite1, C C Nelson, A J Bellett
1Division of Cell Biology, John Curtin School of Medical Research, Australian National University, Canberra ACT.
The New Biologist
|January 1, 1991
Summary
Adenovirus E1a oncogene proteins activate viral and cellular gene transcription. This review integrates data suggesting both major E1a proteins, not just conserved domain 3, participate in trans-activation through multiple protein interactions.
Area of Science:
- Molecular Biology
- Virology
- Gene Regulation
Background:
- Adenovirus E1a oncogene proteins are crucial for viral gene transcription.
- A prevailing model suggests only the largest E1a protein's conserved domain 3 mediates trans-activation.
- Inconsistencies in experimental data challenge this simplified model.
Purpose of the Study:
- To review and rationalize existing experimental data on adenovirus E1a protein function.
- To propose a more integrated model of E1a structure and its role in gene trans-activation.
- To explore the multifaceted interactions of E1a proteins with cellular factors.
Main Methods:
- Literature review and synthesis of experimental findings.
- Analysis of protein structure-function relationships.
- Examination of protein-protein interactions in gene regulation.
Main Results:
- Evidence indicates both major E1a proteins contribute to trans-activation.
- Multiple types of interactions with cellular transcription factors are involved.
- Conserved domain 3 is not the sole mediator of trans-activation.
Conclusions:
- The function of adenovirus E1a proteins in gene trans-activation is more complex than previously thought.
- A revised model incorporating dual protein involvement and diverse interactions is proposed.
- Understanding E1a function is key to deciphering viral oncogenesis and gene regulation.