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.
Active Kinase - Active PKA C beta (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 I, 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 I diluted 5-fold with a 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 - CREBtide synthetic peptide substrate (KRREILSRRPSYR) 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 PKA C beta, Kinase Assay Buffer I, Substrate, and Kinase Dilution Buffer 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 PKA C beta : 10 μL b. Substrate (1 mg/mL; on ice): 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 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)]
The approximate molecular weight is 65 kDa and the average purity is 90%.
Background: PKA C beta
The catalytic subunit C-beta of PKA (PKA C beta ) is a member of the Ser/Thr protein kinase family (the PKA catalytic subunit consists of three gene products: C alpha, C beta, and C gamma ) and has been assigned to human chromosome region 1p36.1 (1). PKA C beta is derived from a gene distinct from C alpha and shows tissue-specific expression. At the amino acid level C alpha and C beta showed 93% homology.
Simard, J. et al. (1992) Human Genetics 88:653.
cAMP-dependent Protein Kinase Catalytic Subunit beta
Entrez Gene IDs:
5567 (Human); 18749 (Mouse); 293508 (Rat)
cAMP-dependent protein kinase catalytic beta subunit isoform 4ab; cAMP-dependent protein kinase catalytic subunit beta; cAPKbeta; DKFZp781I2452; EC 2.7.11; EC 184.108.40.206; MGC41879; MGC9320; PKA C-beta; PKACb; PRKACB; protein kinase A catalytic subunit beta; protein kinase, cAMP-dependent, catalytic, beta
The reconstitution calculator allows you to quickly calculate the volume of a reagent to reconstitute your vial. Simply enter the mass of reagent and the target concentration and the calculator will determine the rest.