ISGF3, the transcriptional activator induced by interferon alpha, consists of multiple interacting polypeptide chains.

Xin‐Yuan Fu, Daniel S. Kessler, Susan A. Veals, David E. Levy, James Darnell

Proceedings of the National Academy of Sciences · 1990 · 501 citations · 28 references

Concepts

Abstract

Interferon-stimulated gene factor 3 (ISGF3) is the ligand-dependent transcriptional activator that, in response to interferon treatment, is assembled in the cell cytoplasm, is translocated to the nucleus, and binds the consensus DNA site, the interferon-stimulated response element. We have purified ISGF3 and identified its constituent proteins: a DNA-binding protein of 48 kDa and three larger polypeptides (84, 91, and 113 kDa), which themselves do not have DNA-binding activity. The multisubunit structure of ISGF3 most likely reflects its participation in receiving a ligand-dependent signal, translocating to the nucleus, and binding to DNA to activate transcription.

References

28