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. 1990 Jul 15;269(2):321–327. doi: 10.1042/bj2690321

Identification of glycosylphosphatidylinositol-specific phospholipases C in mouse brain membranes.

F Fouchier 1, T Baltz 1, G Rougon 1
PMCID: PMC1131579  PMID: 2167064

Abstract

Using the membrane form of variant surface glycoprotein from Trypanosoma equiperdum labelled with [3H]myristate as a substrate, we identified two glycosylphosphatidylinositol phospholipase C enzymic activities in mouse brain. These activities were associated with particulate membrane fractions. They were characterized by their pH activity maxima and sensitivity to activators and ion chelators. One of the activities was maximal at acidic pH, stimulated by butanol, sensitive to cation chelator and insensitive to manganese. The activity of the other was maximal at neutral pH, stimulated by the detergent deoxycholate and independent of the presence of cation chelator or calcium. On membrane subfractionation, the acidic butanol-stimulated activity was found mainly associated with the lysosomal compartment, whereas the neutral deoxycholate-stimulated activity sediments with the myelin and plasma membrane compartment. These activities could be differentiated from particulate phosphatidylinositol phospholipases C, whose acidic lysosomal form is sensitive to manganese and insensitive to cation chelator or butanol, whereas the deoxycholate-activated enzymes are Ca2(+)-dependent.

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Selected References

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