Assay ID Assay name Description Components of the assay SYS-A044 ERBB2-3/ SH2(GRB2) receptor. readout

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1 ERBB2-3/SH2(GRB2) targetscreener Assay SYS-A044 SYS-A044C10 systasy bioscience GmbH Adams-Lehmann-Str München Tel. +49 (0) Fax. +49 (0) Product Description The ERBB2-3/SH2(GRB2) targetscreener Assay has been designed to monitor human ERBB3 receptor activation using the luc2 firefly luciferase gene (Fluc) as final readout. The targetscreener Assay components are to be transfected into PC12 cells, which are stimulated with agonists and/or antagonists, followed by luciferase readings. For a control agonist and antagonist, the addition of EGF-like domain and the specific ERBB inhibitor lapatinib is recommended. Assay ID Assay name Description Components of the assay SYS-A044 ERBB2-3/ Monitor ERBB3 Plasmids encoding SH2(GRB2) receptor 1. SYS-V153, perbb3-ntev-tevs-gv targetscreener activation using a 2. SYS-V1545, psh2-grb2-ctev firefly luciferase 3. SYS-V655, perbb2 readout 4. SYS-V747, pg10-fluc Cells 1. SYS-C10, PC12 (only SYS-A044C10) Technology Principle The ERBB2-3/SH2(GRB2) targetscreener Assay allows the monitoring of ERBB3 receptor activation. The assay is based on the splitsensor technology, which is a highly sensitive, flexible and easy-to-use reporter assay system to robustly and quantitatively monitor the activity of receptor tyrosine kinases (RTKs) under diverse stimuli conditions (e.g. compound concentrations, time points etc.). The technology is based on the functional complementation of TEV protease fragments fused to interaction partners of choice. Addition of an agonist, such as the EGF-like domain (EGFld) activates the RTK ERBB3, resulting in the recruitment of the phospho-adapter SH2(GRB2). In this setup, the RTK is fused to the NTEV fragment, a TEV protease cleavage site (tevs) and the artificial transcriptional co-activator GAL4-VP16 (GV). The adapter is fused to the CTEV fragment. An activationdependent interaction between the RTK and the adapter causes the NTEV and CTEV fragments of the TEV protease to reconstitute its proteolytic activity. Next, GV is released and translocates to the nucleus where it binds to upstream activating sequences (10xUAS) to initiate transcription of the firefly (Fluc) reporter gene. In turn, Fluc catalyzes the reaction of the substrate luciferin to oxyluciferase and light, enabling a quantitative readout. A Renilla luciferase (Rluc) driven by the thymidine kinase (TK) promoter (not provided) may be cotransfected as internal control. Figure 1 Schematic representation of the RTK/adapter assay. ERBB2-3/SH2(GRB2) targetscreener Assay, SYS-A044 SYS-A044C10 1

2 Product Information Target: ERBB3 Adapter: SH2(GRB2) Ligand: EGF-like domain Inhibitor: Lapatinib Specification: ERBB2 and ERBB3 receptor activity can be measured using a firefly luciferase readout. Species: Human Format: 5 vials of plasmid DNA, 2 vials of PC12 cells (only SYS-A044C10) Storage: DNA: at -20 C; cells at - 80 C up to 2 weeks or at -196 C for more than 2 weeks Assay medium: in DMEM 1g/L glucose, 1% FCS, without phenol red Maintenance medium: in DMEM 1g/L glucose, 5% HS, 10% FCS Validation of Performance Performance: Dose-response curve for the ERBB3 agonist EGF-like domain (EGFld). Figure 2. Dose response curve of ERBB3 activation using EGFld. The EC 50 is at a concentration of 2.924ng/ml EGFld. Assay performed in PC12 cells, error bars represent s.e.m. Dose-response curve for the ERBB3 antagonist lapatinib. Figure 3. Dose response curve of ERBB3 inactivation using lapatinib. The IC 50 is at a concentration of µM lapatinib. Assay performed in PC12 cells with a constant EGFld stimulus (10ng/ml), error bars represent s.e.m. ERBB2-3/SH2(GRB2) targetscreener Assay, SYS-A044 SYS-A044C10 2

3 Additionally Required Material Media Supplier Cat. Number DMEM 1g/L glucose, 500 ml ThermoFisher DMEM 1g/L glucose, 500 ml, no phenol red ThermoFisher Opti-MEM ThermoFisher Serum and other additives Fetal Bovine Serum (Heat Inactivated), ThermoFisher ml (EU approved) Horse Serum (Heat Inactivated), 500 ml ThermoFisher (EU approved) GlutaMAX, 100x, 100ml ThermoFisher Penicillin-Streptomycin Mixture Lonza DE17-602E Transfection reagent Lipofectamine 2000 ThermoFisher Suggested material for 96-well plates and coating 96-well white plates Falcon Poly-L-Lysine hydrobromide, mw , 100mg Sigma-Aldrich P MG Suggested assay control reagents EGF-like domain Reprokine RKQ02297 Lapatinib ditosylate, 99%, 10mg Axon 1395 Suggested material for luciferase assay 5x Passive Lysis Buffer Promega E1941 Steady-Glo Luciferase Assay System Promega E2520 If using Renilla as control: Dual- Luciferase Reporter 1000 Assay System Promega E1980 Handling of Cells Coating of 96-well plates with Poly-L-Lysine (PLL): 1. Make a PLL solution of 0.02 mg/ml diluted in H2O. 2. Cover each well in a 96-well plate with PLL solution and incubate for min. 3. Wash wells 2 times with H2O and let plates air-dry. 4. Optional: irradiate the plates with UV-light for 30 min. ERBB2-3/SH2(GRB2) targetscreener Assay, SYS-A044 SYS-A044C10 3

4 Thawing cells: 1. Thaw the cells by placing the cryo vial directly from liquid nitrogen or dry ice into a 37 C water bath (~ 2 min). 2. Add 1 ml 37 C warm Maintenance medium and mix medium with the cell suspension by gentle pipetting. 3. Centrifuge for 4 min at 800 rpm. 4. Carefully remove the supernatant and resuspend the cell pellet in 12 ml Maintenance medium by pipetting and plate the cells onto a 10 cm dish. Propagating and cultivating cells: 1. PLL-coat 10cm or 15cm cell culture dishes. 2. Prewarm Maintenance medium, PBS and Trypsin/EDTA in a 37 C water bath. 3. Place your cells under the cell culture hood. Remove and discard medium. 4. Briefly rinse the cells with PBS and then add as much as Trypsin/EDTA that the whole surface of the dish is covered (e.g. 6 ml on a 15-cm dish, 3 ml on a 10-cm dish) 5. Place the dish for 2-5 minutes in the incubator and let the cells detach. Observe cells under a microscope, until they are dispersed. 6. Add the same volume of medium (containing FBS) as used for Trypsin/EDTA to stop the reaction. Aspirate the cells by gently pipetting. 7. Transfer the mixture to a 15 ml Falcon and centrifuge at 500 g for 5 minutes. 8. Aspirate the supernatant and resuspend the cells in about 5 ml fresh medium. 9. Depending on the estimated days of propagation split the cells 1:3-1: Add fresh medium to the cells. Medium to be Prepared Maintenance medium: Assay medium: DMEM, 1g/L glucose + 5% heat-inactivated HS + 10% heat-inactivated FBS + 1% GlutaMAX (2mM) + 1% Pen/Strep DMEM, 1g/L glucose, without phenol red + 1% heat-inactivated FBS + 1% GlutaMAX (2mM) ERBB2-3/SH2(GRB2) targetscreener Assay, SYS-A044 SYS-A044C10 4

5 Protocol for the targetscreener Assay On-plate transfection of targetscreener Assay components 1. One day before the assay, plate the amount of cells needed for the assay: rinse (with PBS), trypsinize and detach, spin down, and resuspend the cells in Maintenance medium (in 100µl per 96-well). Plate cells on PLL-coated 96-well plates. 2. Mix the plasmid DNAs according to the scheme below. 3. Mix Opti-MEM, GlutaMAX and LF Vortex. 5. Incubate 2 minutes. 6. Combine LF2000/Opti-MEM and DNA mix. 7. Vortex. 8. Incubate 20 minutes at room temperature. 9. Remove the medium from the wells without aspirating cells. 10. Add 30µl/96-well of the DNA/LF2000/Opti-MEM mix onto the cells. 11. Incubate 2h at 37 C. 12. Add 60µl/96-well of Maintenance medium. 13. Incubate 16-24h for protein expression. 14. Exchange the Maintenance medium with 60 µl Assay medium. 15. Incubate 16-18h to induce starvation. 16. Add compounds/stimuli in a volume of 60µl/96-well (added as a 2x concentrated mix diluted in Assay medium). 17. Incubate 30 mins. Optional for stimulation with agonists only: Incubate for 12-18h and proceed directly to step Add the EGFld positive stimulus in a volume of 12µl/96-well (added as a 10x concentrated mix diluted in Assay medium). 19. Incubate 12-18h. 20. Run luciferase assay (see below). Luciferase Assay protocol 1. Remove the medium and add 25µl of 1x Passive Lysis buffer to each well. 2. Incubate the cell lysates for 10min on a rocking platform at room temperature. 3. Perform luciferase readout: Add 50 µl of firefly substrate (from commercial Steady-Glo Luciferase Kit, Promega), read your plate using a luciferase plate reader. OR: Perform the Dual luciferase readout if using Renilla as control: a. Add 50 µl of firefly substrate (from commercial Dual Luciferase Kit, Promega), read your plate using a luciferase plate reader. b. Add 50 µl of Renilla substrate (from commercial Dual Luciferase Kit, Promega, read your plate using a luciferase plate reader. ERBB2-3/SH2(GRB2) targetscreener Assay, SYS-A044 SYS-A044C10 5

6 Table 1: Amounts of plasmids, medium, and cells used per 96-well plate DNA/Single well DNA/Per plate Unit ID of plasmid, name µg SYS-V153, perbb3- NTEV-tevS-GV µg SYS-V1545, psh2-grb2-ctev µg SYS-V655, perbb µg SYS-V747, pg10-fluc Cells/96-well Cells/per plate Cell type PC12 µl/96-well ml/per plate Medium/reagent µl Lipofectamine µl GlutaMAX 30 3 ml Opti-MEM 60 6 ml Maintenance medium, for step ml Assay medium, for step ml Compounds/stimuli in Assay medium, for step ,2 ml EGFld in Assay medium, for step 18 ERBB2-3/SH2(GRB2) targetscreener Assay, SYS-A044 SYS-A044C10 6