Skip to main page content
U.S. flag

An official website of the United States government

Dot gov

The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site.

Https

The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

Access keys NCBI Homepage MyNCBI Homepage Main Content Main Navigation
. 2004 Sep 17;279(38):39199-206.
doi: 10.1074/jbc.M400815200. Epub 2004 Jun 1.

STAT2 nuclear trafficking

Affiliations
Free article

STAT2 nuclear trafficking

Gregg Banninger et al. J Biol Chem. .
Free article

Abstract

STAT2 is a transcription factor critical to the signal transduction pathway of type I interferons (e.g. IFNalpha). STAT2 resides primarily in the cytoplasm and is tyrosine-phosphorylated after IFNalpha binds to cell surface receptors. In response to tyrosine phosphorylation STAT2 rapidly localizes to the nucleus and acquires the ability to bind specific DNA _targets in association with two other proteins, STAT1 and IFN regulatory factor-9 (IRF-9). To elucidate the mechanisms that regulate cellular localization of STAT2, we investigated STAT2 nuclear trafficking both prior to tyrosine phosphorylation and after phosphorylation. Prior to phosphorylation, STAT2 is primarily resident in the cytoplasm, however, we found that it dynamically shuttles between nuclear and cytoplasmic compartments. The nuclear translocation of latent unphosphorylated STAT2 was found to be dependent on its constitutive association with IRF-9, and the export of STAT2 from the nucleus was contingent upon the function of an intrinsic nuclear export signal within the carboxyl terminus of STAT2. STAT2 export could be inhibited with leptomycin B, indicating a nuclear export signal within STAT2 is recognized by the CRM1 exportin carrier. In contrast, following tyrosine phosphorylation, STAT2 dimerizes with phosphorylated STAT1 and accumulates in the nucleus. In the absence of STAT1, STAT2 does not accumulate in the nucleus. In addition, subsequent to nuclear import of phosphorylated STAT2, it redistributes to the cytoplasm within an hour coordinate with its dephosphorylation in the nucleus. The regulation of STAT2 nuclear trafficking is distinct from the previously characterized STAT1 factor.

PubMed Disclaimer

Similar articles

Cited by

Publication types

MeSH terms

LinkOut - more resources

  NODES
Association 2
twitter 2