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  • M7933 - Anti-phospho-MAP Kinase Kinase 3/6 (pSer189/207) antibody produced in rabbit

M7933 Sigma

Anti-phospho-MAP Kinase Kinase 3/6 (pSer189/207) antibody produced in rabbit

affinity isolated antibody, buffered aqueous glycerol solution



Related Categories Alphabetical Index, Antibodies, Antibodies for Cell Biology, Antibodies for Kinase/Phosphatase Biology, Antibodies to Phosphoproteins at Phosphoserine (pSer),
species reactivity   mouse, rat, human
application(s)   immunoprecipitation: 1:250
  western blot (chemiluminescent): 1:1,000 using anisomycin-treated NIH-3T3 cell extract
clone   polyclonal
antibody form   affinity isolated antibody
form   buffered aqueous glycerol solution
shipped in   wet ice
storage temp.   −20°C
Gene Information   human ... MAP2K3(5606)
mouse ... Map2k3(26397)
rat ... Map2k3(303200)
biological source   rabbit
conjugate   unconjugated



synthetic phospho-Ser189 peptide corresponding to residues around Ser189/207 of human MKK3.

General description

Activation of MAPK signalling requires the phosphorylation of upstream MAPK kinases or MKKs. MKK3, MKK6 are activate the p38 MAPK isoforms, p38α, p38δ, with the probable involvement of MKK4. MEKKs do not activate the ERK or SAPK/JNK MAPK signalling. MEKK3/6 also mediate the stimulation of pro-α1(l) collagen by TGF-β1 signalling. TGF-β1 signaling stimulates VEGF via activation of p38α and p38β by MEKK3, in murine mesangial cells. Both MEKK3 and MEKK6 are activated in response to cellular stress and inflammatory cytokines. The phosphorylation sites are Ser189 and Thr193 for MKK3 and Ser207 and Thr211 for MKK6.
Anti-phospho-MAP Kinase Kinase 3/6 (MKK3/6) (phosphoserine 189/207) detects MKK3/MKK6 only when phosphorylated at Ser189/207. It does not cross-react with the corresponding phosphorylated MEK, MEK2, and MKK4/Sek1.

Physical form

Solution in 10 mM sodium HEPES, pH 7.5, containing 150 mM sodium chloride, 100 μg/ml bovine serum albumin and 50% glycerol


The antibody detects MKK3/6 only when phosphorylated at Ser189/207. It does not react with non-phosphorylated MKK3 or MKK6 or phosphorylated MKK4/SEK1, MEK or MEK-2.


Anti-phospho-MAP Kinase Kinase 3/6 (MKK3/6) (phosphoserine 189/207) may be used at a working dilution of 1:1000 for detection by immunoblotting in NIH-3T3 cells treated with anisomycin. The antibody may be used in immunoblotting application in rat hepatoma Fao and human hepatoma HepG2 cells. The antibody is also suitable for immunoprecipitation at a working dilution of 1:250.

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