RAS activation assays

OK Oliver A. Kent
MS Manipa Saha
EC Etienne Coyaud
HB Helen E. Burston
NL Napoleon Law
KD Keith Dadson
SC Sujun Chen
EL Estelle M. Laurent
JS Jonathan St-Germain
RS Ren X. Sun
YM Yoshinori Matsumoto
JC Justin Cowen
AM Aaryn Montgomery-Song
KB Kevin R. Brown
CI Charles Ishak
JR Jose La Rose
DC Daniel D. De Carvalho
HH Housheng Hansen He
BR Brian Raught
FB Filio Billia
PK Peter Kannu
RR Robert Rottapel
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Serum starved cells were stimulated with 10% FBS (final concentration) for 1–12 min to activate RAS. Cells were washed with cold PBS, lysed with TX100 buffer (25 mM TRIS pH 7.5, 100 mM NaCl, 5 mM EDTA, 1% Triton) supplemented with protease and phosphatase inhibitors (Roche) and incubated for 1 h at 4 °C with rotation. An aliquot was removed for analysis of total RAS in the whole cell lysate and the remainder incubated with 10ug GST-tagged Raf-binding domain (RBD, gift from Ikura lab). Complexes were immunoprecipitated with magnetic glutathione-agarose beads (Sigma Aldrich). IPs were washed with TX100 buffer and RAS-GTP eluted by boiling in 2X sample buffer.

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