Failure of actinomycin D to block the activation of Dol-P-Man synthase in isoproterenol-treated capillary endothelial cells, supported that isoproterenol effect was not mediated by active transcription of the Dol-P-Man synthase gene during a short-term β-adrenoreceptor stimulation. Instead, it was a net effect of protein phosphorylation by cAMP-dependent protein kinase. Using antibody as a probe we have now demonstrated that Dol-P-Man synthase activity is associated with a 32 kDa ER phosphoprotein.

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