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MSST0019 Sigma-Aldrich

SILuProt MAPK3 Mitogen activated protein kinase 3 human

recombinant, expressed in HEK 293 cells, SIL MS Protein Standard, 13C and 15N-labeled

Synonym: Erk1, MAP kinase 3, p44

  •  NACRES NA.12



Related Categories Biochemicals and Reagents, Proteins and Derivatives, SILuProt Protein Standards for Quantitative Mass Spectrometry More...
Quality Level   200
recombinant   expressed in HEK 293 cells
assay   ≥95% (SDS-PAGE)
form   liquid
potency   ≥98% Heavy amino acids incorporation efficiency by MS
conjugate   His tagged
suitability   suitable for mass spectrometry (standard)
UniProt accession no.   P27361
storage temp.   −20°C


General description

SILu Prot MAPK3 is a recombinant, stable isotope-labeled human MAPK3 which incorporates [13C6, 15N4]-Arginine and [13C6, 15N2]-Lysine. Expressed in human 293 cells, it is designed to be used as an internal standard for bioanalysis of MAPK3 in mass-spectrometry. SILu Prot MAPK3 is a monomer of 399 amino acids (including N-terminal polyhistidine and flag tags), with a molecular weight of ~45.5 kDa.

Biochem/physiol Actions

MAPK3, the first mammalian MAPK to be characterized and cloned, is commonly expressed in most tissues and is activated through the small guanosine triphosphatase Ras and sequential activation of the protein kinases Raf and MEK upon stimulation of cells with a broad range of extracellular signals. Erk was suggested to be a good marker for estradiol and tamoxifen effects. Alzheimer’s disease’s Erk1 and Erk2 index values were inversely correlated with disease duration, suggesting maximal efficacy for early diagnosis. In addition, differential Erk1 and Erk2 phosphorylation, could have important clinical utility for providing increased certainty in the positive diagnosis of AD, particularly in the early phase of disease progression.



Physical form

Supplied as a 0.1 mg/mL solution of 20mM sodium phosphate, pH 8.0, 1M NaCl.

Legal Information

This product is licensed under U.S. Patent No. 7,396,688 and foreign counterparts from E. I. du Pont de Nemours and Company. The purchase of this product conveys to the buyer the nontransferable right to use the purchased amount of the product for research and development only, including services for a third party for consideration. The buyer cannot sell or otherwise transfer this product, its components or materials made using this product or its components to a third party. Information about licenses for excluded uses is available from: E. I. du Pont de Nemours and Company; Attn: Associate Director, Commercial Development; DuPont Experimental Station E268; 200 Powdermill Rd.; Wilmington, DE 19803; 1-877-881-9787 (voice), 1-302-695-1437 (fax), licensing@dupont.com.

SILu is a trademark of Sigma-Aldrich Co. LLC

Safety & Documentation

Safety Information

GHS07  GHS07
Signal word 
Hazard statements 
Precautionary statements 
NONH for all modes of transport
WGK Germany 
Flash Point(F) 
Not applicable
Flash Point(C) 
Not applicable


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