Letter | Published:

Modulation of brain polyphosphoinositide metabolism by ACTH-sensitive protein phosphorylation

Nature volume 286, pages 623625 (07 August 1980) | Download Citation

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Abstract

Phosphorylation of membrane components is thought to be an important process in membrane function1. Phosphorylated proteins2 and a special class of phospholipids, the (poly)phos-phoinositides (poly PI)3, are implicated in the regulation of membrane permeability and synaptic transmission in neurones. For many years, protein phosphorylation and poly PI metabolism have been studied in parallel without knowledge of their possible interaction. We report here that the ACTH-sensitive protein kinase/B-50 protein complex which we recently isolated in soluble form from rat brain synaptosomal plasma membranes4,5 has lipid phosphorylating activity. Exogenously added phosphatidylinositol 4-phosphate (DPI) is phosphorylated to phosphatidylinositol 4,5-diphosphate (TPI), and this DPI-kinase activity is dependent on the state of phosphorylation of the protein kinase/B-50 protein complex. The results imply that phosphorylation of protein may affect the metabolism of (poly)PI in brain cell membranes.

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Author information

Author notes

    • K. W. A. Wirtz

    Laboratory of Biochemistry, State University of Utrecht, Padualaan 8, Utrecht, The Netherlands

Affiliations

  1. Division of Molecular Neurobiology, Rudolf Magnus Institute for Pharmacology and Laboratory for Physiological Chemistry, Medical Faculty, Institute of Molecular Biology, State University of Utrecht

    • J. Jolles
    • , H. Zwiers
    • , C. J. van Dongen
    • , P. Schotman
    • , K. W. A. Wirtz
    •  & W. H. Gispen

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https://doi.org/10.1038/286623a0

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