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  • 05-481 - Anti-phospho-MAP Kinase1/2 Antibody

05-481 Sigma-Aldrich

Anti-phospho-MAP Kinase1/2 Antibody

Detect phospho-MAP Kinase1/2 using this Anti-phospho-MAP Kinase1/2 validated for use in WB, IP, ELISA & IC.

Synonym: Extracellular signal-regulated kinase, Insulin-stimulated MAP2 kinase, MAP kinase 1, MAPK 1, Microtubule-associated protein 2 kinase, extracellular signal-related kinase 1, mitogen-activated protein kinase 3

  •  eCl@ss 32160702

  •  NACRES NA.41



Related Categories Alphabetical Index, Antibodies, M1-MAR, Primary Antibodies
clone   12D4, monoclonal
biological source   mouse
application(s)   ELISA: suitable
  immunocytochemistry: suitable
  immunoprecipitation (IP): suitable
  western blot: suitable
species reactivity   avian, human, rat, mouse, canine
shipped in   wet ice
isotype   IgG1κ
antibody product type   primary antibodies
Quality Level   100
mfr. no.   Upstate®
NCBI accession no.   NM_002745
UniProt accession no.   P27361


General description

The extracellular signal-regulated kinases 1 and 2 (ERK1 and ERK2), also called p44 and p42 MAP kinases, are members of the Mitogen Activated Protein Kinase (MAPK) family of proteins found in all eukaryotes. Because the 44 kDa ERK1 and the 42 kDa ERK2 are highly homologous and both function in the same protein kinase cascade, the two proteins are often referred to collectively as ERK1/2 or p44/p42 MAP kinase. The ERK1/2 signaling cascade has been shown to be a critical regulator of cell differentiation, cell physiology and neuronal function. Aberrant control of ERK1/2 activity has been implicated in a variety of pathological conditions, including cancer and autoimmune diseases, and efficient study methods are in demand. Extracellular signal/mitogen activated protein kinases (erk/MAPK) are a group of proline-directed serine/threonine kinases that are activated by dual phosphorylation of conserved threonine and tyrosine residues within a characteristic T X Y peptide motif. The mitogen-activated kinases erk1 (MAPK1) and erk2 (MAPK2) acquire full enzymatic activity upon phosphorylation of both threonine and tyrosine residues within the sequence motif T E Y.


Specific for phosphorylated (activated) Erk1 and Erk2. Antibody recognition requires phosphorylation of both the threonine and tyrosine residues of Erk1/Erk2 and will not interact with the non-phosphorylated form of the proteins. Does not cross react with activated SAP Kinase 1 or 2.


KLH-conjugated phosphopeptide containing the pTEpY motif of Erk1 and Erk2. Clone: 12D4


Immunoprecipitation: Use 1-10 μg per immuno-precipitation.

Research Category

Research Sub Category
MAP Kinases

Target description

42-44 kDa

Physical form

Format: Purified

Purified mouse monoclonal IgG1k lyophilized from 1 mL 2x PBS / 0.09 % Na-azide / PEG and Sucrose.
Reconstitute with 1 mL H2O (15 min, RT) for a final concentration of 100 μg/mL.

Thiophilic adsoption and size exclusion chromatography

Storage and Stability

Stable for 1 year at from date of receipt.


Unless otherwise stated in our catalog or other company documentation accompanying the product(s), our products are intended for research use only and are not to be used for any other purpose, which includes but is not limited to, unauthorized commercial uses, in vitro diagnostic uses, ex vivo or in vivo therapeutic uses or any type of consumption or application to humans or animals.


Evaluated by western blot on RIPA lysates from EGF-stimulated human A431 carcinoma cells.

Western Blot Analysis: 0.1-1.0 μg/mL of this antibody detected phospho-MAPK in RIPA lysates from EGFstimulated human A431 carcinoma cells.

Analysis Note

Included Positive Control Lysate: Catalog # 12-302, EGF-stimulated A431 lysate. Add 2.5 μL of 2-mercaptoethanol/100 μL of lysate and boil for 5 minutes to reduce the preparation. Load 20 μg (20 μL) of reduced lysate per lane for minigels.

Other Notes

Concentration: Please refer to the Certificate of Analysis for the lot-specific concentration.

Safety & Documentation

Safety Information

Safety Information for this product is unavailable at this time.


Certificate of Analysis (COA)

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Protocols & Articles


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