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1. Microsomes from guinea-pig brain grey matter were incubated with [(32)P]ATP at 3mm concentration and the phosphate bound to the acid-washed, lipid-free residue was determined. 2. The binding process was Mg(2+)-dependent and resulted in the transfer of about 1-2 mmumoles of phosphate/mg. of protein/min. Under the conditions used univalent cations (Na(+),K(+) and Li(+)) inhibited the binding. 3. An unspecified proportion of this bound phosphate could be recovered in protein-derived phosphorylserine. The yield of labelled phosphorylserine was also decreased by univalent cations. 4. The bound phosphate formed with 3mm-MgATP was stable; addition of Na(+) or K(+) ions to the already labelled preparation had no effect on the bound phosphate level. 5. Bound phosphate was also formed when a solubilized fraction of the microsomes was incubated with ATP; univalent cations also inhibited this process. 6. p-Chloromercuribenzoate reduced the binding by about 25%; the inhibition was restored by cysteine.

Enzyme transfer of phosphate from adenosine triphosphate to protein-bound serine residues in cerebral microsomes