Turnover of Phosphomonoester Groups and Compartmentation of Polyphosphoinositides in Human Erythrocytes

Overview

Journal Biochem J

Specialty Biochemistry

Date 1986 May 1

PMID 3019307

Citations 16

Authors

E Muller

H HEGEWALD

K JAROSZEWICZ

G A Cumme

H Hoppe

H FRUNDER

Affiliations

Soon will be listed here.

Abstract

The turnover of phosphomonoester groups of phosphatidylinositol 4-phosphate (PtdIns4P) and phosphatidylinositol 4,5-bisphosphate [PtdIns(4,5)P2] was investigated in human erythrocytes by short-term labelling with [32P]Pi. The procedure applied ensured a quantitative extraction of erythrocyte polyphosphoinositides as well as their reliable separation for the determinations of pool sizes and specific radioactivities. The pool sizes of phosphatidylinositol (PtdIns), PtdIns4P and PtdIns(4,5)P2 are 25, 11 and 44 nmol/ml of cells respectively. Under steady-state conditions, the phosphorylation fluxes from [gamma-32P]ATP into PtdIns4P and PtdIns(4,5)P2 are in the ranges 14-22 and 46-94 nmol X h-1 X ml of cells-1 respectively. Only 25-60% of total PtdIns4P and 6-10% of total PtdIns(4,5)P2 take part in the rapid tracer exchange, i.e. are compartmentalized. In isolated erythrocyte ghosts, the turnover of PtdIns4P approximately corresponds to that in intact erythrocytes, although any compartmentation can be excluded in this preparation. Under the conditions of incubation employed, the turnover of PtdIns(4,5)P2 is more than one order of magnitude smaller in isolated ghosts than that obtained for intact erythrocytes.

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