attempts to find culture conditions ( e.g . glucose starvation ) or cell treatment ( e.g . insulin ) which might activate glycogen synthase in intact cells were unsuccessful . since glycogen synthase activity present in cho cells was independent of the level of cyclic amp-dependent kinase , we conclude that cyclic amp-dependent protein kinase does not play a critical role in regulating the state of phosphorylation of the synthase .
C0031727
kinase
C0031715
phosphorylation