Cell Signaling Technology

Product Pathways - MAPK Signaling

Phospho-MEK1 (Thr292) Antibody #51265

MAP2K1   MEK-1   MEK1   MKK1  

No. Size Price
51265S 100 µl ( 10 western blots ) ¥3,900.00 现货查询 购买询价
51265 carrier free & custom formulation / quantityemail request
Applications Dilution Species-Reactivity Sensitivity MW (kDa) Isotype
W 1:1000 Human,Mouse,Rat,Monkey, Endogenous 45 Rabbit
IP 1:200

Species cross-reactivity is determined by western blot.

Applications Key: W=Western Blotting, IP=Immunoprecipitation,


Species predicted to react based on 100% sequence homology: Dog, Pig,

Specificity / Sensitivity

Phospho-MEK1 (Thr292) Antibody recognizes endogenous levels of MEK1 protein only when phosphorylated at Thr292. This antibody does not cross-react with MEK2 protein. This antibody cross-reacts with a 170 kDa protein of unknown identity in some cell lysates.

Source / Purification

Polyclonal antibodies are produced by immunizing animals with a synthetic phosphopeptide corresponding to residues surrounding Thr292 of human MEK1 protein. Antibodies are purified by protein A and peptide affinity chromatography.

Western Blotting

Western Blotting

Western blot analysis of extracts from A-431 cells, untreated (-) or λ phosphatase-treated (+), using Phospho-MEK1 (Thr292) Antibody (upper) and MEK1 (D2R1O) Rabbit mAb #12671 (lower).

Western Blotting

Western Blotting

Western blot analysis of extracts from A-431 and MCF7 cells using Phospho-MEK1 (Thr292) Antibody. The phospho-specificity of the antibody was verified by pre-incubating the antibody with no peptide (left), MEK1 non-phosphopeptide (center), and MEK1 (Thr292) phosphopeptide (right).

Western Blotting

Western Blotting

Western blot analysis of extracts from wild-type MEFs (WT MEFs) and Mek1 knock-out MEFs (Mek1 KO MEFs), using Phospho-MEK1 (Thr292) Antibody (upper), MEK1 (D2R1O) Rabbit mAb #12671 (middle), and GAPDH (D16H11) XP® Rabbit mAb #5174 (lower). Mek1 KO MEFs were generously provided by Dr. Jean Charron, Centre de recherche du Centre hospitalier de l'Université Laval, Quebec, Canada.



Immunoprecipitation of phospho-MEK1 from 293T cell extracts. Lane1 is 10% input, lane 2 is Normal Rabbit IgG #2729, and lane 3 is Phospho-MEK1 (Thr292) Antibody. Western Blot analysis was performed using Phospho-MEK1 (Thr292) Antibody.


MEK1 and MEK2, also called MAPK or Erk kinases, are dual-specificity protein kinases that function in a mitogen activated protein kinase cascade controlling cell growth and differentiation (1-3). Activation of MEK1 and MEK2 occurs through phosphorylation of two serine residues at positions 217 and 221, located in the activation loop of subdomain VIII, by Raf-like molecules. MEK1/2 is activated by a wide variety of growth factors and cytokines and also by membrane depolarization and calcium influx (1-4). Constitutively active forms of MEK1/2 are sufficient for the transformation of NIH/3T3 cells or the differentiation of PC-12 cells (4). MEK activates p44 and p42 MAP kinase by phosphorylating both threonine and tyrosine residues at sites located within the activation loop of kinase subdomain VIII.

In response to integrin signaling, p21-activated kinase -1 (PAK-1) phosphorylates MEK1 at Ser298, which enhances MEK1-ERK2 complex formation and MEK1 activation by Raf-1. These events positively regulate the Raf-1-MEK-ERK signaling cascade (5-9). Research studies have identified a negative regulatory loop in the Raf-1-MEK-ERK signaling cascade, in which ERK2-dependent phosphorylation of MEK1 at Thr292 negatively regulates MEK1 activation following cell adhesion. Specifically, ERK2-dependent phosphorylation of MEK1 also attenuates its PAK-1-mediated phosphorylation, contributing to a reduction in Raf-dependent phosphorylation of residues within the MEK1 activation loop (7,10).

  1. Crews, C.M. et al. (1992) Science 258, 478-480.
  2. Alessi, D.R. et al. (1994) EMBO J. 13, 1610-19.
  3. Rosen, L.B. et al. (1994) Neuron 12, 1207-21.
  4. Cowley, S. et al. (1994) Cell 77, 841-52.
  5. Frost, J.A. et al. (1997) EMBO J 16, 6426-38.
  6. Rossomando, A.J. et al. (1994) Mol Cell Biol 14, 1594-602.
  7. Eblen, S.T. et al. (2004) Mol Cell Biol 24, 2308-17.
  8. Eblen, S.T. et al. (2002) Mol Cell Biol 22, 6023-33.
  9. Coles, L.C. and Shaw, P.E. (2002) Oncogene 21, 2236-44.
  10. Xu, B.e. et al. (1999) J Biol Chem 274, 34029-35.

Application References

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