Analysis of E1A-mediated growth regulation functions: binding of the 300-kilodalton cellular product correlates with E1A enhancer repression function and DNA synthesis-inducing activity.

Stein RW, Corrigan M, Yaciuk P, Whelan J, Moran E
J Virol. 1990 64 (9): 4421-7

PMID: 2143544 · PMCID: PMC247911

Adenovirus E1A transforming function requires two distinct regions of the protein. Transforming activity is closely linked with the presence of a region designated conserved domain 2 and the ability of this region to bind the product of the cellular retinoblastoma tumor suppressor gene. We have investigated the biological properties of the second transforming region of E1A, which is located near the N terminus. Transformation-defective mutants containing deletions in the N terminus (deletion of residues between amino acids 2 and 36) were deficient in the ability to induce DNA synthesis and repress insulin enhancer-stimulated activity. The function of the N-terminal region correlated closely with binding of the 300-kilodalton E1A-associated protein and not with binding of the retinoblastoma protein. These results indicate that transformation by E1A is mediated by two functionally independent regions of the protein which interact with different specific cellular proteins and suggest that the 300-kilodalton E1A-associated protein plays a major role in E1A-mediated cell growth control mechanisms.

MeSH Terms (21)

Adenovirus Early Proteins Adenoviruses, Human Animals Antibodies, Monoclonal Cell Line Cell Transformation, Viral Chromosome Deletion DNA, Viral DNA-Binding Proteins DNA Replication Enhancer Elements, Genetic HeLa Cells Humans Insulin Molecular Weight Mutation Oncogene Proteins, Viral Repressor Proteins RNA, Messenger Thymidine Transcription Factors

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