Recombinant Human Active PIM1 Protein, CF Summary
Details of Functionality |
The specific activity of PIM1 is typically 269-363 nmol/min/mg using a synthetic peptide substrate. |
Source |
Spodoptera frugiperda, Sf 9 (baculovirus)-derived human PIM1 protein |
Accession # |
|
N-terminal Sequence |
Using an N-terminal GST tag |
Protein/Peptide Type |
Recombinant Proteins |
Gene |
PIM1 |
Purity |
>90%, by SDS-PAGE under reducing conditions and visualized by Colloidal Coomassie® Blue stain at 5 μg per lane. |
Applications/Dilutions
Dilutions |
|
SDS-PAGE |
62 kDa |
Packaging, Storage & Formulations
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. |
Buffer |
Supplied in 50 mM Tris-HCl, pH 7.5, 150 mM NaCl, 10 mM Glutathione, 0.1 mM EDTA, 0.25 mM DTT, 0.1 mM PMSF, and 25% Glycerol. |
Purity |
>90%, by SDS-PAGE under reducing conditions and visualized by Colloidal Coomassie® Blue stain at 5 μg per lane. |
Assay Procedure |
- Active Kinase - Active PIM1 (0.1 μg/μL) diluted with Kinase Dilution Buffer III to the concentrations indicated 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 prior to use.
- Kinase Dilution Buffer III - Kinase Assay Buffer I diluted at a 1:4 ratio (5X dilution) 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 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.
- Thaw the [33P]-ATP Assay Cocktail in a shielded container in a designated radioactive work area.
- Thaw the Active PIM1, Kinase Assay Buffer I, Substrate, and Kinase Dilution Buffer III on ice.
- In a pre-cooled microfuge tube, add the following reaction components bringing the initial reaction volume up to 20 μL:
a. Diluted Active PIM1: 10 μL b. Stock solution of Substrate (1 mg/mL): 5 μL c. Distilled water (2-8 °C): 5 μL
- 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.
- Initiate the reaction with 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.
- 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.
- 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.
- Count the radioactivity (cpm) on the P81 paper in the presence of scintillation fluid in a scintillation counter.
- 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 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 33P-ATP in cpm/pmol) x (Reaction time in minutes) x (Enzyme amount in μg or mg)] x [(Reaction volume) / (Spot Volume)] |
Notes
This product is produced by and ships from R&D Systems, Inc., a Bio-Techne brand.
Alternate Names for Recombinant Human Active PIM1 Protein, CF
Background
PIM1 is a proto-oncogene that belongs to a family of Ser/Thr protein kinases that are highly conserved through evolution in multicellular organisms. Originally identified from Moloney murine leukemia virus induced T cell lymphomas in mice, PIM1 is involved in the control of cytokine-mediated cell proliferation, differentiation, and survival of lymphoid and myeloid cells as well as others (1). Expression of PIM1 can be stimulated by a variety of growth factors and is regulated at four different levels: transcriptional, post-transcriptional, translational, and post-translational (2). Expression of PIM1 is mediated through activation of the JAK/STAT pathway.
- Meeker, T.C. et al. (1987) J. Cell. Biochem. 35:105.
- Friedmann, M. et al. (1992) Arch. Biochem. Biophys. 298:594.
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