PMID: 9443606Jan 27, 1998Paper

Localization of two forms of phospholipase C-beta1, a and b, in C6Bu-1 cells

Biochimica Et Biophysica Acta
Y Y BahkP G Suh

Abstract

Phospholipase C-beta1 (PLC-beta1), one of the PLC-beta isozymes, exists as two immunologically distinguishable polypeptides of 150 (PLC-beta1a) and 140 kDa (PLC-beta1b) which are encoded in two distinct transcripts and generated by alternative splicing of a single gene. In this study, the subcellular localization of the two phospholipases C-beta1 proteins was examined in rat C6Bu-1 glioma cells using immunological techniques. Immunoblot analysis revealed that the two forms of PLC-beta1 were detectable in both cytosolic and nuclear fractions. PLC-beta1a appeared to be located preferentially in the cytosol, whereas PLC-beta1b was found predominantly in the nuclei of C6Bu-1 cells. Immunocytochemical experiments confirmed the differential localization of the two PLC-beta1 species in C6Bu-1 cells. These results suggest that the two PLC-beta1 proteins may have different physiological roles in the cell.

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