Identification, purification and characterization of a novel phosphatidylinositol-specific phospholipase C, a third member of the beta subfamily. |
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| Authors: | A J Carozzi R W Kriz C Webster P J Parker |
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| Institution: | Imperial Cancer Research Fund, Lincoln's Inn Fields, London, England. |
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| Abstract: | The partial sequence of a novel PtdIns-specific phospholipase C of the beta subfamily (PtdIns-PLC beta 3) is described. Based upon the predicted protein sequence, monospecific antibodies have been raised and used to identify a suitable source for purification of the protein. Fractionation of HeLa S3 cells revealed that immunoreactive PtdIns-PLC beta 3 is membrane associated; purification (approximately 1000-fold) from this fraction yielded a single immunoreactive protein of 158 kDa, with a specific activity of 136 mumol.min-1.mg-1, with PtdIns 4,5-bisphosphate as substrate. Substrate specificity and Ca2+ dependence of this purified PtdIns-PLC are characteristic of the PtdIns-PLC beta subfamily. |
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