Recombinant Human Active p38 alpha Protein, CF

R&D Systems | Catalog # 5477-KS

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Key Product Details

  • R&D Systems Sf 9 (baculovirus)-derived Recombinant Human Active p38 alpha Protein (5477-KS)
  • Quality control testing to verify active proteins with lot specific assays by in-house scientists
  • All R&D Systems proteins are covered with a 100% guarantee

Source

Sf 9 (baculovirus)

Accession Number

NM_139012

Applications

Bioactivity
View all p38 alpha Proteins and Enzymes »

Product Specifications

Source

Spodoptera frugiperda, Sf 9 (baculovirus)-derived human p38 alpha protein

Purity

>85%, by SDS-PAGE under reducing conditions and visualized by Colloidal Coomassie® Blue stain at 5 μg per lane.

N-terminal Sequence Analysis

Using an N-terminal GST tag

SDS-PAGE

67 kDa

Activity

The specific activity of p38 alpha is typically 148-201 nmol/min/mg using an ATF2 substrate.

Scientific Data Images for Recombinant Human Active p38 alpha Protein, CF

Recombinant Human Active p38 alpha Protein SDS-PAGE

Recombinant Human Active p38 alpha Protein SDS-PAGE.

The approximate molecular weight is 67 kDa and the purity is > 85%.

Formulation, Preparation, and Storage

5477-KS
Formulation Supplied in 50 mM Tris-HCl (pH 7.5), 150 mM NaCl, 0.25 mM DTT, 10 mM Glutathione, 0.1 mM EDTA, 0.1 mM PMSF, and 25% Glycerol.
Shipping The product is shipped with dry ice or equivalent. Upon receipt, store it immediately at the temperature recommended below.
Stability & Storage This product is stable at ≤ ‑70 °C for up to 1 year from the date of receipt. For optimal storage, aliquot into smaller quantities after centrifugation and store at recommended temperature. Avoid repeated freeze-thaw cycles.

Background: p38 alpha

p38 alpha (SAPK2A) is a member of the p38 MAPK family which are activated by various environmental stresses and pro-inflammatory cytokines (1). The activation of p38 requires its phosphorylation by MAP kinase kinases (MKKs) or its autophosphorylation triggered by the interaction of MAP3K7IP1/TAB1 protein with this kinase (2). The substrates of p38 include transcription regulator ATF2, MEF2C, MAX, cell cycle regulator CDC25B, and tumor suppressor p53, which suggest the roles of this kinase in stress related transcription and cell cycle regulation, as well as in genotoxic stress response.

References

  1. Han, J. et al. (1994) Science 265:808.
  2. Ge, B. et al. (2002) Science 295:1291.

Alternate Names

MAPK14, SAPK2a

Entrez Gene IDs

1432 (Human); 26416 (Mouse); 81649 (Rat)

Gene Symbol

MAPK14

UniProt

NM_139012 (Human)

Additional p38 alpha Products

Product Documents for Recombinant Human Active p38 alpha Protein, CF

Certificate of Analysis

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Note: Certificate of Analysis not available for kit components.

Product Specific Notices for Recombinant Human Active p38 alpha Protein, CF

For research use only

Citations for Recombinant Human Active p38 alpha Protein, CF

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Protocols

View specific protocols for Recombinant Human Active p38 alpha Protein, CF (5477-KS):

Materials
  • Active Kinase - Active p38 alpha (0.1 μg/μL) diluted with Kinase Dilution Buffer III as shown in Figure 2. Note: These are suggested working dilutions. Optimal dilutions should be determined by each laboratory for each application.
  • Kinase Assay Buffer I - 25 mM MOPS, pH 7.2, 12.5 mM beta -glycerolphosphate, 25 mM MgCl2, 5 mM EGTA, 2 mM EDTA. Add 0.25 mM DTT to the Kinase Assay Buffer I prior to use.
  • Kinase Dilution Buffer III - Kinase Assay Buffer I diluted at a 1:4 ratio (5-fold) with 50 ng/μL BSA solution.
  • 10 mM ATP Stock Solution - Prepare the ATP Stock Solution by dissolving 55 mg of ATP in 10 mL of Kinase Assay Buffer I. Store 200 μL aliquots at ≤ -20 °C.
  • [33P]-ATP Assay Cocktail - Prepare 250 μM [33P]-ATP Assay Cocktail in a designated radioactive work area by combining 150 μL of 10 mM ATP Stock Solution, 100 μL of [33P]-ATP (1 mCi/100 μL), and 5.75 mL of Kinase Assay Buffer I. Store in 1 mL aliquots at ≤ -20 °C.
  • Substrate - P38 Sub synthetic peptide (IPTTPITTTYFFFKKK) diluted in distilled water to a final concentration of 1.0 mg/mL.
  1. Thaw the [33P]-ATP Assay Cocktail in a shielded container in a designated radioactive work area.
  2. Thaw the Active p38 alpha, Kinase Assay Buffer I, Substrate, and Kinase Dilution Buffer III on ice.
  3. In a pre-cooled microfuge tube, add the following reaction components bringing the initial reaction volume up to 20 μL:
    a. Diluted Active p38 alpha : 10 μL
    b. Substrate (1.0 mg/mL; on ice): 5.0 μL
    c. Distilled or deionized water: 5.0 μL
  4. Set up the blank control as outlined in Step 3, excluding the addition of the substrate. Replace the substrate with an equal volume of distilled or deionized water.
  5. Initiate the reaction by the addition of 5 μL [33P]-ATP Assay Cocktail, bringing the final volume up to 25 μL. Incubate the mixture in a water bath at 30 °C for 15 minutes.
  6. After the 15 minute incubation period, terminate the reaction by spotting 20 μL of the reaction mixture onto individual pre-cut strips of phosphocellulose P81 paper.
  7. Air dry the pre-cut P81 strip and sequentially wash in a 1% phosphoric acid solution (add 10 mL of phosphoric acid to 990 mL of distilled or deionized water) with constant gentle stirring. It is recommended that the strips be washed a total of three times for approximately 10 minutes each.
  8. Count the radioactivity on the P81 paper in the presence of scintillation fluid in a scintillation counter.
  9. Determine the corrected cpm by subtracting the blank control value (see Step 4) for each sample and calculate the kinase specific activity as outlined below:


    Calculation of [33P]-ATP Specific Activity (SA) (cpm/pmol)
    Specific Activity (SA) = cpm for 5 μL [33P]-ATP/pmol of ATP (in 5.0 μL of a 250 μM ATP stock solution; i.e. 1250 pmol)

    Calculation of Kinase Specific Activity (SA) (pmol/minute/μg or nmol/minute/mg)
    Corrected cpm from reaction / [(SA of 33P-ATP in cpm/pmol) x (Reaction time in minutes) x (Enzyme amount in μg or mg)] x [(Reaction volume) / (Spot Volume)]

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