bmbrl at biovax.leeds.ac.uk wrote:
: I'm in the process of setting up an assay system to see if a membrane protein
: I've purified is a substrate for cAMP-dependent protein kinase (PKA).
: Firstly, what concentrations of ATP should I be using? If I add [32P]ATP to
: the reaction mixture the final concentration will be ~0.1uM. Would this be
: enough to indicate preferred substrates for phosphorylation?
For PKA phosphorylation of a soluble protein I used a final concentration
of 0.1 mM ATP with an activity of roughly 1E6 cpm. I think if you add
only radioactive ATP the ATP will become quickly the limiting factor.
Be aware of the fact that a phosphorylation in vitro does not necessarily
mean anything in vivo.
--Cornelius.
--
/* Cornelius Krasel, U Wuerzburg, Dept. of Pharmacology, Versbacher Str. 9 */
/* D-97078 Wuerzburg, Germany email: phak004 at rzbox.uni-wuerzburg.de */
/* "Science is the game we play with God to find out what His rules are." */
