1-NM-PP1

In vitro kinase assays

We carried out in vitro kinase assays (except for Cdc28) in the presence of 0.2 μCi /μl [γ-32P]ATP at low ATP concentration (10 nM) so that IC50 values represent a rough measure of the inhibition constant (Ki). Measurement of inhibitor IC50 values were done as Liu, Y. et al. described. Purified Cdc28–His6 (1 nM) and MBP–Clb2 (3 nM) were incubated for 10 min at 23℃ in a 25 μl reaction mixture containing 5 μg histone H1, 1 μCi of [γ-32P]ATP (1 μCi per 10 μM and 1μCi per 1 mM), and varying concentrations of 1-NM-PP1 in kinase buffer (25mM HEPES-NaOH pH 7.4, 10mM NaCl, 10mM MgCl2 and 1mM dithiothreitol). Reaction products were analysed by 15% SDS–PAGE followed by autoradiography. For the determination of Cdc28 kinetic constants, varying concentrations of [γ-32P]ATP (1 μCi per 100 μM) were incubated and analysed as above.

Cell lines

PDK1?/? ES cells

Preparation method

This compound is soluble in DMSO. General tips for obtaining a higher concentration: Please warm the tube at 37℃ for 10 minutes and/or shake it in the ultrasonic bath for a while. Stock solution can be stored below -20℃ for several months.

Reacting condition

10 μM for 24h-72h; or 20 μM for 48h

Applications

1-NM-PP1 suppressed the phosphorylation of PDK1 targets in PDK1?/? ES cells expressing PDK1 L159G but not WT PDK1. Moreover, 1-NM-PP1 inhibited sorbitol-induced MSK1 S212 T-loop phosphorylation, ERK/p38MAPK phosphorylation sites S581 and ERK/p38 dependent autophosphorylation at S376. 1-NM-PP1 also inhibited IGF1-stimulated PKB/Akt T308 phosphorylation and S6K activity in PDK1?/? +LG ES cells.

References:

1. Bishop, A. C., Ubersax, J. A., Petsch, D. T., Matheos, D. P., Gray, N. S., Blethrow, J., Shimizu, E., Tsien, J. Z., Schultz, P. G., Rose, M. D., Wood, J. L., Morgan, D. O. and Shokat, K. M. (2000) A chemical switch for inhibitor-sensitive alleles of any protein kinase. Nature. 407, 395-401

2. Tamguney, T., Zhang, C., Fiedler, D., Shokat, K. and Stokoe, D. (2008) Analysis of 3-phosphoinositide-dependent kinase-1 signaling and function in ES cells. Exp Cell Res. 314, 2299-2312