Recombinant Human Active RSK1 Protein, CF

  • Purity
    >70%, by SDS-PAGE under reducing conditions and visualized by Colloidal Coomassie® Blue stain at 5 μg per lane.
  • Activity
    The activity of RSK1 is typically 159-215 nmol/min/mg using a synthetic peptide substrate (see Activity Assay Protocol).
  • Source
    Spodoptera frugiperda, Sf 9 (baculovirus)-derived
  • Accession #
  • N-terminal Sequence
    Using an N terminal GST Tag
    The approximate molecular weight is 108 kDa
Formulation Supplied in 50 mM Tris-HCl (pH 7.5), 150 mM NaCl, 0.25 mM DTT, 0.1 mM EGTA, 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 one 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.
Assay Procedure
  • Active Kinase - Active RSK1 (0.1 μg/μL) diluted with Kinase Dilution Buffer. Note: These are suggested working dilutions. Optimal dilutions should be determined by each laboratory for each application.
  • Kinase Assay Buffer, pH 7.2 - 25 mM MOPS, 12.5 mM beta -glycerolphosphate, 25 mM MgCl2, 5 mM EGTA, 2 mM EDTA. Add 0.25 mM DTT to the Kinase Assay Buffer prior to use.
  • Kinase Dilution Buffer, pH 7.2 - Kinase Assay Buffer diluted 5-fold with distilled or deionized water.
  • 10 mM ATP Stock Solution - Prepare the ATP Stock Solution by dissolving 55 mg of ATP in 10 mL of Kinase Assay Buffer. Store 200 μL aliquots at ≤ -20 °C.
  • [32P]-ATP Assay Cocktail - Prepare 250 μM [32P]-ATP Assay Cocktail in a designated radioactive work area by combining 150 μL of 10 mM ATP Stock Solution, 100 μL of [32P]-ATP (1 mCi/100 μL), and 5.75 mL of Kinase Assay Buffer. Store 1 mL aliquots at ≤ -20 °C.
  • Substrate - S6K synthetic peptide substrate (KRRRLASLR) diluted in distilled or deionized water to a final concentration of 1 mg/mL.
  1. Thaw the [32P]-ATP Assay Cocktail in a shielded container in a designated radioactive work area.
  2. Thaw the Active RSK1, Kinase Assay Buffer, Substrate, and Kinase Dilution Buffer 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 RSK1: 10 μL
    b. Substrate (1 mg/mL; on ice): 10 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 with the addition of 5 μL [32P]-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, 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 [32P]-ATP Specific Activity (SA) (cpm/pmol)
    Specific Activity (SA) = cpm for 5 μL [32P]-ATP/pmol of ATP (in 5 μL of a 250 μM ATP stock solution; i.e. 1250 pmol)

    Calculation of Kinase Specific Activity (SA) (pmol/minutes/μg or nmol/minutes/mg)
    Corrected cpm from reaction / [(SA of 32P-ATP in cpm/pmol) x (Reaction time in minutes) x (Enzyme amount in μg or mg)] x [(Reaction volume) / (Spot Volume)]
Data Images
The approximate molecular weight is 108 kDa and the average purity is 90%.
Background: RSK1
RSK1 is a member of the RSK (ribosomal S6 kinase) family that consists of growth factor-regulated serine/threonine kinases. RSK1 contains two non-identical kinase catalytic domains and phosphorylates various substrates, including members of the mitogen-activated kinase (MAPK) signaling pathway. RSK1 encodes a predicted 735 amino acid protein containing 2 distinct consensus ATP-binding site sequences. RSK1 transcript is present in lymphocytes, skeletal muscle, liver, and adipose tissue (1). RSKs are implicated in the activation of the mitogen-activated kinase (MAPK) cascade and the stimulation of cell proliferation and differentiation (2).
  • References:
    1. Moller, D.E. et al. (1994) Am. J. Physiol. 266:C351.
    2. Gross, S.D. et al. (1999) Science 286:1365.
  • Long Name:
    Ribosomal Protein S6 Kinase I
  • Entrez Gene IDs:
    6195 (Human); 20111 (Mouse); 81771 (Rat)
  • Alternate Names:
    90kD, polypeptide 1); EC 2.7.11; EC,90 kDa ribosomal protein S6 kinase 1; HU-1; MAP kinase-activated protein kinase 1a; MAPK-activated protein kinase 1a; MAPKAP kinase 1a; MAPKAPK-1a; MAPKAPL1A; p90RSK1; p90S6K; ribosomal protein S6 kinase alpha 1; ribosomal protein S6 kinase alpha-1; ribosomal protein S6 kinase, 90kD, polypeptide 1; ribosomal protein S6 kinase, 90kDa, polypeptide 1; Ribosomal S6 kinase 1; RPS6KA1; RSK; RSK-1; RSK1p90-RSK 1; S6K-alpha 1; S6K-alpha-1
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