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pubmed-article:4377211pubmed:abstractTextThe soluble activity in lymphocytes which converts phosphatidylinositol into 1,2-diacylglycerol and inositol phosphates requires Ca(2+) ions. At pH7 maximum activity occurs at [Ca(2+)](free) approximately 0.7mum whereas at pH5.5 the equivalent value is approx. 50mum. At [Ca(2+)](free) approximately 1mum, a concentration similar to common intracellular values, essentially all activity is confined to the peak of activity at pH7.0. Previous reports of requirements for larger amounts of Ca(2+) may reflect the fact that the Ca(2+)-buffering capacity of phosphatidylinositol means that high substrate concentrations can effectively decrease [Ca(2+)](free). Cations which displace Ca(2+) from association with phosphatidylinositol can, at low [Ca(2+)](free), enhance enzyme activity. Phosphatidylinositol breakdown in intact cells might be controlled, at least in part, by changes in intracellular [Ca(2+)](free).lld:pubmed
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pubmed-article:4377211pubmed:articleTitlePhosphatidylinositol cleavage in lymphocytes. Requirement for calcium ions at a low concentration and effects of other cations.lld:pubmed
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