PRKG1, active, GST tagged, human PRECISIOÒ recombinant, expressed in Sf9 cells

Catalog Number R8282 Storage Temperature –70 °C

Synonyms: PGK, CGKI, FLJ36117, MGC71944, Figure 1. cGKI-BETA, cGKI-alpha, DKFZp686K042 SDS-PAGE Gel of Typical Lot: ³70% (SDS-PAGE, densitometry) Product Description PRKG1 is a homodimer with each monomer containing a regulatory cGMP-binding domain and a catalytic domain.1 By Northern blot analysis PRKG1 shows the highest expression levels in the bladder, uterus, adrenal gland, and fallopian tube. PRKG1 plays an important stimulatory role in platelet activation.2 Expression of recombinant PRKG1 in a reconstituted cell model enhanced von Willebrand factor-induced activation of the platelet integrin aIIb/b3. Prkg1 knockout mice showed impaired platelet responses to VWF or low Figure 2. doses of thrombin, and prolonged bleeding time. Specific Activity of Typical Lot: Human platelet aggregation induced by VWF or 663–897 nmole/min/mg low-dose thrombin was inhibited by PRKG1 inhibitors but enhanced by cGMP.

This recombinant product was expressed by baculovirus in Sf9 insect cells using an N-terminal GST-tag. The accession number is NM 006258. It is supplied in 50 mM Tris-HCl, pH 7.5, with 150 mM NaCl, 0.25 mM DTT, 0.1 mM EGTA, 0.1 mM EDTA, 0.1 mM PMSF, and 25% glycerol.

Molecular mass: ~100 kDa

Precautions and Disclaimer Procedure This product is for R&D use only, not for drug, Preparation Instructions household, or other uses. Please consult the Material Kinase Assay Buffer – 25 mM MOPS, pH 7.2, 12.5 mM Safety Data Sheet for information regarding hazards glycerol 2-phosphate, 25 mM MgCl2, 5 mM EGTA, and and safe handling practices. 2 mM EDTA. Just prior to use, add DTT to a final concentration of 0.25 mM. Storage/Stability Kinase Dilution Buffer – Dilute the Kinase Assay Buffer The product ships on dry ice and storage at –70 °C is recommended. After opening, aliquot into smaller 5-fold with a 50 ng/ml BSA solution. quantities and store at –70 °C. Avoid repeated handling and multiple freeze/thaw cycles. Kinase Solution – Dilute the active PRKG1 (0.1 mg/ml) 6. Air dry the precut P81 strip and sequentially wash with Kinase Dilution Buffer to the desired concentration. in the 1% phosphoric acid solution with constant Note: The specific activity plot may be used as a gentle stirring. It is recommended the strips be guideline (see Figure 2). It is recommended the washed a total of 3 times of ~10 minutes each. researcher perform a serial dilution of active PRKG1 for 7. Set up a radioactive control to measure the total optimal results. g-32P-ATP counts introduced into the reaction. Spot 5 ml of the g-32P-ATP Assay Cocktail on a precut 10 mM ATP Stock Solution – Dissolve 55 mg of ATP in P81 strip. Dry the sample for 2 minutes and read 10 ml of Kinase Assay Buffer. Store in 200 ml aliquots at the counts. Do not wash this sample. –20 °C. 8. Count the radioactivity on the P81 paper in the presence of scintillation fluid in a scintillation g-32P-ATP Assay Cocktail (250 mM) – Combine 5.75 ml counter. of Kinase Assay Buffer, 150 ml of 10 mM ATP Stock 9. Determine the corrected cpm by subtracting the Solution, 100 ml of g-32P-ATP (1 mCi/100 ml). Store in blank control value (see step 3) from each sample 1 ml aliquots at –20 °C. and calculate the kinase specific activity

Substrate Solution – Dissolve the synthetic peptide Calculations: substrate (KRRRLSSLRA) in water at a final 1. Specific Radioactivity (SR) of ATP (cpm/nmole) concentration of 1 mg/ml. SR = cpm of 5 ml of g-32P-ATP Assay Cocktail 1% phosphoric acid solution – Dilute 10 ml of nmole of ATP concentrated phosphoric acid to a final volume of 1 L with water. cpm – value from control (step 7) nmole – 1.25 nmole (5 ml of 250 mM ATP Kinase Assay Assay Cocktail) This assay involves the use of the 32P radioisotope. All institutional guidelines regarding the use of 2. Specific Kinase Activity (SA) (nmole/min/mg) radioisotopes should be followed. nmole/min/mg = Dcpm ´ (25/20) 1. Thaw the active PRKG1, Kinase Assay Buffer, SR ´ E ´ T Substrate Solution, and Kinase Dilution Buffer on ice. The g-32P-ATP Assay Cocktail may be thawed SR = specific radioactivity of the ATP (cpm/nmole ATP) at room temperature. Dcpm = cpm of the sample – cpm of the blank (step 3) 2. In a pre-cooled microcentrifuge tube, add the 25 = total reaction volume following solutions to a volume of 20 ml: 20 = spot volume 10 ml of Kinase Solution T = reaction time (minutes) 5 ml of Substrate Solution E = amount of (mg) 5 ml of cold water (4 °C) 3. Set up a blank control as outlined in step 2, References substituting 5 ml of cold water (4 °C) for the 1. Orstavik, S. et al., Characterization of the human Substrate Solution. gene encoding the type I-alpha and type I-beta 4. Initiate each reaction with the addition of 5 ml of the cGMP-dependent protein kinase (PRKG1). 32 Genomics, 42, 311-318, (1997). g- P-ATP Assay Cocktail, bringing the final 2. Li, Z. et al., A stimulatory role for cGMP-dependent reaction volume to 25 l. Incubate the mixture in a m protein kinase in platelet activation. Cell, 112, water bath at 30 °C for 15 minutes. 77-86, (2003). 5. After the 15 minute incubation, stop the reaction by spotting 20 ml of the reaction mixture onto an PRECISIO is a registered trademark of Sigma-Aldrich individually precut strip of phosphocellulose P81 Co. LLC. paper. JB,JR,MAM 06/12-1

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