Recombinant Human Active PLK1 Protein, CF

• Active Kinase - Active PLK1 (0.1 μg/μL) diluted with Kinase Dilution Buffer IX and assayed as outlined in Sample Activity Plot. Note: These are suggested working dilutions and it is recommended that the researcher perform a serial dilution of active PLK1 for optimal results.
• Kinase Assay Buffer III (5X) - 200 mM Tris-HCl, pH 7.4, 100 mM MgCl₂, and 0.5 mg/mL BSA. Add fresh DTT prior to use to a final concentration of 250 μM.
• Kinase Dilution Buffer IX (1X) - Kinase Assay Buffer III diluted at a 1:4 ratio (5X dilution) with cold distilled or deionized water. Add fresh DTT to the aliquot prior to use to a final concentration of 50 μM.
• ADP-Glo™ Kinase Assay Kit - 10 mM ATP Solution, 10 mM ADP Solution, ADP-Glo™ Reagent, and Kinase Detection Reagent.
• Substrate - PLKtide peptide substrate was diluted in 20 mM Tris-HCl, pH 7.5 solution to a final concentration of 1 mg/mL.

1. Thaw the Active PLK1, Kinase Assay Buffer III (5X), and Substrate on ice. Prepare a 15 μL enzyme dilution at the desired concentration, with Kinase Dilution Buffer IX (1X), in a pre-chilled 96-well plate.
2. Prepare a Substrate/ATP mixture as follows (25 μM example):
   a. 10 mM ATP Solution: 1 μL
   b. Kinase Assay Buffer III (5X): 79 μL
   c. Substrate at 1 mg/mL: 80 μL
3. Transfer the following reaction components prepared in Step 2 to a 384-well opaque plate, bringing the reaction volume up to 5 μL:
   a. 3 μL of diluted Active PLK1
   b. 2 μL of Substrate/ATP mix as prepared in Step 2. This initiates the reaction.
4. Set up the blank control as outlined in Step 2, excluding the addition of the kinase. Replace the kinase with an equal volume of Kinase Dilution Buffer IX (1X).
5. Incubate at ambient temperature for 40 minutes.
6. After the 40 minute incubation period, terminate the reaction and deplete the remaining ATP by adding 5 μL of ADP-Glo™ Reagent. Spin down and shake the 384-well plate. Then incubate the reaction mixture for another 40 minutes at ambient temperature.
7. Add 10 μL of the Kinase Detection Reagent to the 384-well plate and incubate the reaction mixture for another 30 minutes at ambient temperature.
8. Read the 384-well reaction plate using the Luminescence Module Protocol on a GloMax®-Multi Microplate Multimode Reader.
9. Determine the corrected activity (RLU) by removing the blank control value (see Step 4) for each sample and calculate the kinase specific activity as outlined below.
   
   
   Calculation of Specific Activity of ADP (RLU/pmol)
   From ADP standard curve, determine RLU/pmol of ADP
   
   Kinase Specific Activity (SA) (pmol/min/μg or nmol/min/mg)
   Corrected RLU from reaction / [(SA of ADP in RLU/pmol) x (Reaction time in min) x (Enzyme amount in μg or mg)]

Scientific Data

SDS-PAGE View Larger

The approximate molecular weight is 70 kDa and the purity is > 90%.