Functional interactions within adenovirus E1A protein complexes.

Abstract:

:The transforming potential of adenovirus E1A oncogene products derives largely from the formation of complexes with cellular proteins, including the p105Rb tumor suppressor and a related p107 species, p130 and p300 proteins, and cyclin A (p60cycA). Extensive quantitative analyses using E1A deletion mutants identified unique binding patterns for each of these polypeptides within the amino terminus and conserved regions 1 and 2 (CR1 and CR2) of E1A proteins. A novel protein, termed p400, was found by peptide mapping to be related to p300, and, like p300, to require the E1A amino terminus and a portion of CR1 for binding. p130 was shown to be related to p107, and like p107, to associate with p60cycA. p107, p130 and p105Rb all interacted primarily with CR2, however, sequences within CR1 and the amino terminus were capable of weak interactions and appeared to function cooperatively with CR2 to bind these proteins. Protein kinase activity present in E1A complexes probably derives at least in part from p60cycA-linked p33cdk2 associated with p107 and p130. In vitro phosphorylation of complexes purified by immunoprecipitation resulted in labeling of several proteins. p60cycA was phosphorylated to about the same extent in cyclin A complexes prepared from either AD5- or mock-infected KB cells, however, that of p130 and p107 was dramatically higher in p60cycA complexes from infected cells. p300 was also phosphorylated in complexes prepared using E1A-specific antibodies. Thus one role of E1A proteins in signal transduction and regulation of the cell cycle may be to control the biological activity of p107, p130 and p300 by enhancing their phosphorylation through complex formation.

journal_name

Oncogene

journal_title

Oncogene

authors

Barbeau D,Charbonneau R,Whalen SG,Bayley ST,Branton PE

subject

Has Abstract

pub_date

1994-02-01 00:00:00

pages

359-73

issue

2

eissn

0950-9232

issn

1476-5594

journal_volume

9

pub_type

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