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Mouse Monoclonal to STAT1

SM1 (IgG2b)

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STAT1 (signal transducer and activator of transcription 1) is a transcription factor that plays important roles in growth arrest, apoptosis promoting and tumour suppression. After ligation of cytokine receptors STAT1 becomes phosphorylated on Tyr701 by Janus kinase JAK1 or JAK2, dimerizes, translocates to nucleus and contacts DNA. STAT1-STAT2 heterodimers serve as more potent transcriptional inducers than STAT1 homodimers. STAT1 is also phosphorylated on Ser727 by MAPK pathway, independently of tyrosine phosphorylation. However, the both modifications are important for its maximal transcriptional activity. On the other hand, STAT1 phosphorylated on Ser727 is targeted for proteasomal degradation.


The antibody SM1 recognizes an epitope included within amino acids 721-733 of STAT1, a 91 kDa transcriptional factor involved in a variety of systems including antiviral responses and interferon alpha (IFN-alpha) and gamma (IFN-gamma) signal transduction.

Regulatory Status


STAT1 peptide sequence 721-733 (DNLLPMSPEEFDE).

Species Reactivity:

  • Human
  • Mouse
  • Other not tested

Negative Species:


  • Immunoprecipitation
  • Western Blotting
  • Immunohistochemistry (paraffin sections)
    Recommended dilution: 5 μg/ml
    Positive tissue: lung macrophages
Usage note:
Indicated dilutions are recommended starting points for use of this product. Working concentrations should be determined by the investigator.

General references

  • *Kovarik P, Stoiber D, Eyers PA, Menghini R, Neininger A, Gaestel M, Cohen P, Decker T: Stress-induced phosphorylation of STAT1 at Ser727 requires p38 mitogen-activated protein kinase whereas IFN-gamma uses a different signaling pathway. Proc Natl Acad Sci U S A. 1999 Nov 23;96(24):13956-61. [Abstract] [Full Text]
  • *Frank DA: STAT signaling in the pathogenesis and treatment of cancer. Mol Med. 1999 Jul;5(7):432-56. [Abstract] [Full Text]
  • *Bromberg J, Darnell JE Jr: The role of STATs in transcriptional control and their impact on cellular function. Oncogene. 2000 May 15;19(21):2468-73. [Abstract] [Full Text]
  • *Soond SM, Townsend PA, Barry SP, Knight RA, Latchman DS, Stephanou A: ERK and the E3 ubiquitin ligase beta TRCP targets STAT1 for degradation. J Biol Chem. 2008 Mar 31 [Abstract] [Full Text]
  • Product Specific References

  • *Kovarik J, Boudny V, Kocak I, Lauerova L, Fait V, Vagundova M: Malignant melanoma associates with deficient IFN-induced STAT 1 phosphorylation. Int J Mol Med. 2003 Sep;12(3):335-40. [Abstract]
  • *Boudny V, Kocak I, Lauerova L, Kovarik J: Interferon inducibility of STAT 1 activation and its prognostic significance in melanoma patients. Folia Biol (Praha). 2003;49(4):142-6. [Abstract]
  • For research use only. Not for drug, diagnostic or other use.

    Related Products

  • Mouse IgG2b Isotype Control
  • Example Data

    Stat-1 /activated Stat-1 Western blotting
    Fig. 1. Induction of phosphorylation of STAT1 (Western Blotting)

    Fig. 1: Induction of phosphorylation of STAT1 at Ser727 in human malignant melanoma cells (short-term culture derived from a patient) in response to interferons.

    Subconfluent cells were serum-starved before exposure to activation dosages of IFN-gamma (10 ng/ml) and IFN-alpha (1000 IU/ml and 5000 IU/ml). Western blotting analysis of cell extracts shows detection of phosphorylated STAT1 (Ser727) by the antibody PSM1 (upper panel) and total STAT1 level by the antibody SM1 (lower panel).

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