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J. Virol., Jan 1997, 129-137, Vol 71, No. 1
NL Lill, MJ Tevethia, R Eckner, DM Livingston and N Modjtahedi
Several cellular polypeptides critical for growth regulation interact with
DNA tumor virus oncoproteins. p400 is a cellular protein which binds to the
adenovirus E1A oncoprotein(s). The biological function of p400 is not yet
known, but it is structurally and immunologically closely related to p300
and CREB-binding protein, two known E1A-binding transcription adapters.
Like p300, p400 is a phosphoprotein that binds to the simian virus 40 large
tumor antigen (T). In anti-T coimmunoprecipitation experiments, staggered
deletions spanning the amino-terminal 250 amino acids of T did not abrogate
T binding to either p400 or p300. A T species composed of residues 251 to
708 bound both p400 and p300, while a T species defective in p53 binding
was unable to bind either detectably. Anti-p53 immunoprecipitates prepared
from cells containing wild-type T also contained p400 and p300. Hence, both
p400 and p300 can bind (directly or indirectly) to a carboxyl- terminal
fragment of T which contains its p53 binding domain. Since the p53 binding
domain of T contributes to its immortalizing and transforming activities,
T-p400 and/or T-p300 interactions may participate in these functions.
Copyright © 1997, American Society for Microbiology
p300 family members associate with the carboxyl terminus of simian virus 40 large tumor antigen
Division of Neoplastic Disease Mechanisms, Dana-Farber Cancer Institute, Harvard Medical School, Boston, Massachusetts 02115, USA.
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