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4 protocols using normal mouse igg1

1

Quantifying CDK2 Kinase Activity in PDAC Cells

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To analyze the CDK2 kinase activity, primary PDAC cells that were exposed to DMSO or palbociclib (200 nM) for 48 hour were lysed using the kinase lysis buffer (50 mM HEPES-KOH pH 7.5, 150 mM NaCl, 1 mM EDTA, 1mM DTT, 0.1% Tween-20) in the presence of 1X Halt protease inhibitor (Thermo Fisher) and 1 mM PMSF (Sigma). Active CDK2 complex was immunoprecipitated by incubating 300 μg of the lysate with 5 μg of anti-CDK2 (Santa Cruz Biotechnology; SC-6248) overnight at 4°C. Normal mouse IgG1 (Cell Signaling Technology, 5415) was used as a control. Protein G agarose-beads were added to each IP samples and incubated up to 4 hour at 4°C. Protein immunocomplexes were washed 3 times with the kinase lysis buffer and 2 times with kinase reaction buffer (40 mM Tris-HCl pH 8, 20 mM MgCl2, 0.1 mg/mL BSA, 50 μM DTT). Kinase reactions were carried out in 100 μl of kinase buffer in the presence of 100 μM ATP and 0.5 μg of bacterially purified RB C-terminal as substrate25 (link) by gently shaking at room temperature up to 30 minutes. The resulting phosphorylated RB protein was detected by immunoblotting using anti-pRb (S807/S811) antibody (Cell Signaling Technology, 8516S).
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2

Quantifying CDK2 Kinase Activity in PDAC Cells

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To analyze the CDK2 kinase activity, primary PDAC cells that were exposed to DMSO or palbociclib (200 nM) for 48 hour were lysed using the kinase lysis buffer (50 mM HEPES-KOH pH 7.5, 150 mM NaCl, 1 mM EDTA, 1mM DTT, 0.1% Tween-20) in the presence of 1X Halt protease inhibitor (Thermo Fisher) and 1 mM PMSF (Sigma). Active CDK2 complex was immunoprecipitated by incubating 300 μg of the lysate with 5 μg of anti-CDK2 (Santa Cruz Biotechnology; SC-6248) overnight at 4°C. Normal mouse IgG1 (Cell Signaling Technology, 5415) was used as a control. Protein G agarose-beads were added to each IP samples and incubated up to 4 hour at 4°C. Protein immunocomplexes were washed 3 times with the kinase lysis buffer and 2 times with kinase reaction buffer (40 mM Tris-HCl pH 8, 20 mM MgCl2, 0.1 mg/mL BSA, 50 μM DTT). Kinase reactions were carried out in 100 μl of kinase buffer in the presence of 100 μM ATP and 0.5 μg of bacterially purified RB C-terminal as substrate25 (link) by gently shaking at room temperature up to 30 minutes. The resulting phosphorylated RB protein was detected by immunoblotting using anti-pRb (S807/S811) antibody (Cell Signaling Technology, 8516S).
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3

Immunoprecipitation for α-Synuclein in KD Patients

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Human tissue (2 infantile KD patients, 1 late-onset KD patient, and an infantile control) was obtained from the University of Maryland Brain Tissue Bank. Immunoprecipitation was performed using Dynabeads protein G (cat# 10007D, ThermoFisher Scientific) and a Dynamag-2 magnet (cat# 12321D, ThermoFisher Scientific). Initially, 50 µl of protein G beads were washed and incubated overnight at 4 °C with 5 µg of anti-α-synuclein (cat# MA1-90342, ThermoFisher Scientific) or normal mouse IgG1 (cat# 5415, Cell Signaling). Beads were washed and then incubated overnight at 4 °C with tissue lysate. Lysate was prepared from about 250 mg tissue from each sample homogenized in 30 volumes of sterile PBS with protease inhibitors (cat# 88668, ThermoFisher Scientific) using a T8.10 disperser polytron tissue homogenizer (IKA Works, Inc., Wilmington, NC). After incubation, lysate was removed and beads were washed 3 times with 200 μl PBS and transferred to a clean tube. PBS buffer was then removed and beads were used for psychosine extraction or protein elution.
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4

Kinase Activity Assay for CDK2 in PDAC Cells

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To analyse the CDK2 kinase activity, primary PDAC cells were lysed using
the kinase lysis buffer (50 mM HEPES-KOH pH 7.5, 150 mM NaCl, 1 mM EDTA, 1 mM
DTT, 0.1% Tween-20) in the presence of 1X Halt protease inhibitor (Thermo
Fisher) and 1 mM PMSF (Sigma). Active CDK2 complex was immunoprecipitated by
incubating 300 μg of the lysate with 5 μg of anti-CDK2 (Santa Cruz
Biotechnology, SC-6248) overnight at 4°C. Normal mouse IgG1 (Cell
Signaling Technology, 5415) was used as a control. Protein G agarose-beads were
added to each IP samples and incubated up to 4 hour at 4°C. Protein
immuno-complexes were washed three times with the kinase lysis buffer and two
times with kinase reaction buffer (40 mM Tris-HCl pH 8, 20 mM MgCl2,
0.1 mg/mL BSA, 50 μM DTT). Kinase reactions were carried out in 100
μL of kinase buffer in the presence of 100 μM ATP and 0.5
μg of RB protein as substrate by gently shaking at room temperature up to
30 min. The resulting phosphorylated RB protein was detected by immunoblotting
using anti-p-Rb (S807/S811) antibody (Cell Signaling Technology, 8516S).
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