Revision 1

#74620Store at -20C

Cell Signaling Technology

Orders: 877-616-CELL (2355) [email protected]

Support: 877-678-TECH (8324)

Web: [email protected] cellsignal.com

3 Trask LaneDanversMassachusetts01923USA
For Research Use Only. Not for Use in Diagnostic Procedures.
Applications:

WB, IP, ChIP

REACTIVITY:

H M R

SENSITIVITY:

Endogenous

MW (kDa):

62

Source/Isotype:

Mouse IgG2a

UniProt ID:

#P01100

Entrez-Gene Id:

2353

Product Information

Product Usage Information

Application Dilution
Western Blotting 1:1000
Immunoprecipitation 1:200
Chromatin IP 1:50

Storage

Supplied in 10 mM sodium HEPES (pH 7.5), 150 mM NaCl, 100 µg/ml BSA, 50% glycerol and less than 0.02% sodium azide. Store at –20°C. Do not aliquot the antibody.

Specificity / Sensitivity

This antibody detects endogenous levels of total c-Fos protein. The antibody does not cross-react with other Fos proteins, including FosB, FRA1 and FRA2.

Species Reactivity:

Human, Mouse, Rat

Source / Purification

Monoclonal antibody is produced by immunizing animals with a synthetic peptide corresponding to residues near the amino terminus of human c-Fos protein.

Background

The Fos family of nuclear oncogenes includes c-Fos, FosB, Fos-related antigen 1 (FRA1), and Fos-related antigen 2 (FRA2) (1). While most Fos proteins exist as a single isoform, the FosB protein exists as two isoforms: full-length FosB and a shorter form, FosB2 (Delta FosB), which lacks the carboxy-terminal 101 amino acids (1-3). The expression of Fos proteins is rapidly and transiently induced by a variety of extracellular stimuli, including growth factors, cytokines, neurotransmitters, polypeptide hormones, and stress. Fos proteins dimerize with Jun proteins (c-Jun, JunB, and JunD) to form Activator Protein-1 (AP-1), a transcription factor that binds to TRE/AP-1 elements and activates transcription. Fos and Jun proteins contain the leucine-zipper motif that mediates dimerization and an adjacent basic domain that binds to DNA. The various Fos/Jun heterodimers differ in their ability to transactivate AP-1 dependent genes. In addition to increased expression, phosphorylation of Fos proteins by Erk kinases in response to extracellular stimuli may further increase transcriptional activity (4-6). Phosphorylation of c-Fos at Ser32 and Thr232 by Erk5 increases protein stability and nuclear localization (5). Phosphorylation of FRA1 at Ser252 and Ser265 by Erk1/2 increases protein stability and leads to overexpression of FRA1 in cancer cells (6). Following growth factor stimulation, expression of FosB and c-Fos in quiescent fibroblasts is immediate, but very short-lived, with protein levels dissipating after several hours (7). FRA1 and FRA2 expression persists longer, and appreciable levels can be detected in asynchronously growing cells (8). Deregulated expression of c-Fos, FosB, or FRA2 can result in neoplastic cellular transformation; however, Delta FosB lacks the ability to transform cells (2,3).

  1. Tulchinsky, E. (2000) Histol Histopathol 15, 921-8.
  2. Dobrazanski, P. et al. (1991) Mol Cell Biol 11, 5470-8.
  3. Nakabeppu, Y. and Nathans, D. (1991) Cell 64, 751-9.
  4. Rosenberger, S.F. et al. (1999) J Biol Chem 274, 1124-30.
  5. Sasaki, T. et al. (2006) Mol Cell 24, 63-75.
  6. Basbous, J. et al. (2007) Mol Cell Biol 27, 3936-50.
  7. Kovary, K. and Bravo, R. (1991) Mol Cell Biol 11, 2451-9.
  8. Kovary, K. and Bravo, R. (1992) Mol Cell Biol 12, 5015-23.

Species Reactivity

Species reactivity is determined by testing in at least one approved application (e.g., western blot).

Western Blot Buffer

IMPORTANT: For western blots, incubate membrane with diluted primary antibody in 5% w/v BSA, 1X TBS, 0.1% Tween® 20 at 4°C with gentle shaking, overnight.

Applications Key

WB: Western Blotting IP: Immunoprecipitation ChIP: Chromatin IP

Cross-Reactivity Key

H: human M: mouse R: rat Hm: hamster Mk: monkey Vir: virus Mi: mink C: chicken Dm: D. melanogaster X: Xenopus Z: zebrafish B: bovine Dg: dog Pg: pig Sc: S. cerevisiae Ce: C. elegans Hr: horse GP: Guinea Pig Rab: rabbit All: all species expected

Trademarks and Patents

Cell Signaling Technology is a trademark of Cell Signaling Technology, Inc.
SimpleChIP is a registered trademark of Cell Signaling Technology, Inc.
XP is a registered trademark of Cell Signaling Technology, Inc.
All other trademarks are the property of their respective owners. Visit cellsignal.com/trademarks for more information.

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Revision 1
#74620

c-Fos (E7L5L) Mouse mAb

Western Blotting Image 1: c-Fos (E7L5L) Mouse mAb Expand Image
Western blot analysis of extracts from HeLa and NIH/3T3 cells, serum-starved overnight and then either untreated (-) or stimulated with TPA (12-O-Tetradecanoylphorbol-13-Acetate) #4174 (4 hr; +), using c-Fos (E7L5L) Mouse mAb (upper) and GAPDH (D16H11) XP® Rabbit mAb #5174 (lower).
Immunoprecipitation Image 1: c-Fos (E7L5L) Mouse mAb Expand Image
Immunoprecipitation of c-Fos protein from HeLa cell extracts that were serum-starved overnight and stimulated for 4 hours with TPA (12-O-Tetradecanoylphorbol-13-Acetate) #4174. Lane 1 is 10% input, lane 2 is Mouse (G3A1) mAb IgG1 Isotype Control #5415, and lane 3 is c-Fos (E7L5L) Mouse mAb. Western blot analysis was performed using c-Fos (E7L5L) Mouse mAb. Rabbit Anti-Mouse IgG (Light Chain Specific) (D3V2A) mAb (HRP Conjugate) #58802 was used as a secondary antibody.
Chromatin Immunoprecipitation Image 1: c-Fos (E7L5L) Mouse mAb Expand Image
Chromatin immunoprecipitations were performed with cross-linked chromatin from PC-12 cells starved overnight and treated with Human β-Nerve Growth Factor (hβ-NGF) #5221 (50 ng/ml, 2 hr) and either c-Fos (E7L5L) Mouse mAb #74620 or Normal Rabbit IgG #2729 using SimpleChIP® Plus Enzymatic Chromatin IP Kit (Magnetic Beads) #9005. The enriched DNA was quantified by real-time PCR using SimpleChIP® Rat CCRN4L Promoter Primers #7983, rat DCLK1 promoter primers, and SimpleChIP® Rat GAPDH Promoter Primers #7964. The amount of immunoprecipitated DNA in each sample is represented as signal relative to the total amount of input chromatin, which is equivalent to one.