In Vitro MAP kinase assay
9/1998
- Deprive
PC12 cells overnight in 4ml of DMEM+1% BSA+1%Glu/AA
- stimulate
cells with 100ng/ml for 10 minutes
- Lyse
cells in 600ml lysis buffer:
- 50mM
HEPES, pH 7.5
- 150mM
NaCL
- 1.5mM
MgCl2
- 1mM
EGTA
- 0.1%
Triton X-100
- 105
glycerol
- 1mM
Na3VO4,1mM PMSF
- 10mg/ml
aprotinin
- 10mg/ml leupeptin
- Immunoprecipitate
with ant-ERK2 (Santa Cruz, SC-154, 1:100 dilution, 0.5mg anti- ERK2 per condition)
- Wash
3x1ml lysis buffer, 2x 0.5ml kinase buffer (50mM HEPES, pH 7.4, 10mM
MgCl2, 0.5mM DTT, 5mM Na3VO4)
- HEPES
(50mM pH 7.4) 10ml
- MgCl2
(2M) 50ml
- DTT
(1M) 5ml
- Na3VO4 500ml
- Add
10-20mg GST-SH2-Bb to anti-ERK2 immunoprecipitates (could
be reduced to 1mg/reaction)
- Add 50ml reaction buffer, mix at room temp for
30 minutes (mix every 10 min)
Reaction buffer:
Kinase Buffer 700ml
Cold ATP 3ml
([final]=20-100mM)(not necessary)
PI 1ml([final]=10mM)
g-32PATP
(150mCi/ml) 1.3ml (10mCi per reaction)
- Add
400ml lysis buffer and mix, spin
down, transfer the supernatant to a fresh tube
- add 50ml glutathione-agarose beads, rotate in
cold room for 1-2 hrs
- wash
beads with 2x 1ml lysis buffer, 2x 0.5 ml thrombin cleavage buffer
(TCB:50mM Tris-HCl, pH 8.0, 150mM NaCl, 2.5mM CaCl2, 0.1%b-ME)
- Tris-HCl,
pH 8.0 10ml
- NaCl 300ml
- CaCl2 25ml
- B-ME 10ml
- Add
110 ml TCB containing 1U thrombin
(Sigma, T3010), rotate at Room temp 1 hr
- Add 30ml 5x loading buffer, boil 5 minutes,
run 7.5% SDS-PAGE
- transfer
proteins to nitrocellulose membrane
- autoradiography
for 1-3 days
- immunoblot
the membrane with anti-SH2-B