Two Contact Regions Between Stat1 and CBP/p300 in Interferon Gamma Signaling

Overview

Journal Proc Natl Acad Sci U S A

Specialty Science

Date 1996 Dec 24

PMID 8986769

Citations 151

Authors

J J Zhang

U Vinkemeier

W Gu

D Chakravarti

C M Horvath

J E Darnell Jr

Affiliations

Soon will be listed here.

Abstract

Interferon gamma (IFN-gamma) induces rapid tyrosine phosphorylation of the latent cytoplasmic transcription factor, Stat1, which then forms homodimers, translocates to the nucleus and participates in IFN-gamma-induced transcription. However, little is known of the interactions between Stat1 and the general transcription machinery during transcriptional activation. We show here that Stat1 can directly interact with the CREB-binding protein (CBP)/p300 family of transcriptional coactivators. Specifically, two interaction regions were identified: the amino-terminal region of Stat1 interacts with the CREB-binding domain of CBP/p300 and the carboxyl-terminal region of Stat1 interacts with the domain of CBP/p300 that binds adenovirus E1A protein. Transfection experiments suggest a role for these interactions in IFN-gamma-induced transcription. Because CBP/p300-binding is required for the adenovirus E1A protein to regulate transcription of many genes during viral replication and cellular transformation, it is possible that the anti-viral effect of IFN-gamma is based at least in part on direct competition by nuclear Stat1 with E1A for CBP/p300 binding.

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