Cell Signaling Technology

Product Pathways - Nuclear Receptor Signaling

SRC-3 (11B1) Mouse mAb #2115

Applications Reactivity Sensitivity MW (kDa) Isotype
W IF-IC F H Endogenous 160 Mouse IgG1

Applications Key:  W=Western Blotting  IF-IC=Immunofluorescence (Immunocytochemistry)  F=Flow Cytometry
Reactivity Key:  H=Human
Species cross-reactivity is determined by western blot. Species enclosed in parentheses are predicted to react based on 100% sequence homology.

Protocols

Specificity / Sensitivity

SRC-3 (11B1) Mouse mAb detects endogenous levels of total SRC-3 protein.

Source / Purification

Monoclonal antibody is produced by immunizing animals with recombinant human SRC-3 polypeptide fragment (a.a. 1-250).

Western Blotting

Western Blotting

Western blot analysis of cell extracts from various cell lines, using SRC-3 (11B1) Mouse mAb.

Flow Cytometry

Flow Cytometry

Flow cytometric analysis of MCF-7 cells, using SRC-3 (11B1) Mouse mAb (blue) compared to a nonspecific negative control antibody (red).

IF-IC

IF-IC

Confocal immunofluorescence images of MCF-7 cells labeled with SRC-3 (11B1) Mouse mAb (red). Actin filaments have been labeled with fluorescein phalloidin. Blue pseudocolor = DRAQ5® #4084 (fluorescent DNA dye).


Background

There are three members of the steroid receptor co-activator (SRC) family of proteins: SRC-1 (NCoA-1), SRC-2 (TIF2/GRIP1/NCoA-2) and SRC-3 (ACTR/pCIP/RAC3/TRAM-1/AIB1). The SRC family members all share significant structural homology and function in a similar fashion to stimulate transcription mediated by nuclear hormone receptors and other transcriptional activators such as STAT3, NF-κB, E2F1 and p53 (1-4). Two SRC proteins, SRC-1 and SRC-3, function as histone acetyltransferases (5,6). In addition, all three family members can recruit other histone acetyltransferases (CBP/p300, PCAF) and histone methyltransferases (PRMT1, CARM1) to target promoters and cooperate to enhance expression of many genes (5-8). The SRC proteins play important roles in multiple physiological processes including cell proliferation, cell survival, somatic cell growth, mammary gland development, female reproductive function and vasoprotection (9). SRC-1 and SRC-3 are conduits for kinase-mediated growth factor signaling to the estrogen receptor and other transcriptional activators. Seven SRC-1 phosphorylation sites and six SRC-3 phosphorylation sites have been identified, which are induced by steroids, cytokines and growth factors and involve multiple kinase signaling pathways (9-11). All three SRC family members are associated with increased activity of nuclear receptors in breast, prostate and ovarian carcinomas. In addition, SRC-3 is frequently amplified or over-expressed in a number of cancers (12), and SRC-1/PAX3 and SRC-2/MYST3 translocations are found associated with rhabdomyosarcoma and acute myeloid leukemia, respectively (13,14).

  1. Giraud, S. et al. (2002) J. Biol. Chem. 277, 8004-8011.
  2. Na, S.Y. et al. (1998) J. Biol. Chem. 273, 10831-10834.
  3. Louie, M.C. et al. (2004) Mol. Cell Biol. 24, 5157-5171.
  4. Lee, S.K. et al. (1999) Mol. Endocrinol. 13, 1924-1933.
  5. Spencer, T.E. et al. (1997) Nature 389, 194-198.
  6. Chen, H. et al. (1997) Cell 90, 569-580.
  7. Koh, S.S. et al. (2001) J. Biol. Chem. 276, 1089-1098.
  8. Chen, D. et al. (1999) Science 284, 2174-2177.
  9. Wu, R.C. et al. (2004) Mol. Cell 15, 937-949.
  10. Rowan, B.G. et al. (2000) J. Biol. Chem. 275, 4475-4483.
  11. Zhou, H.J. et al. (2005) Cancer Res. 65, 7976-7983.
  12. Torres-Arzayus, M.I. et al. (2004) Cancer Cell 6, 263-274.
  13. Wachtel, M. et al. (2004) Cancer Res. 64, 5539-5545.
  14. Deguchi, K. et al. (2003) Cancer Cell 3, 259-271.

Application References

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This product is intended for research purposes only. The product is not intended to be used for therapeutic or diagnostic purposes in humans or animals.

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