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Characterization of the phosphatidylinositol-specific phospholipase C-released form of rat osseous plate alkaline phosphatase and its possible significance on endochondral ossification

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Abstract

Alkaline phosphatase activity was released up to 100% from the membrane by incubating the rat osseous plate membrane-bound enzyme with phosphatidylinositol-specific phospholipase C. The molecular weight of the released enzyme was 145,000 on Sephacryl S-300 gel filtration and 66,000 on PAGE-SDS, suggesting a dimeric structure. Solubilization of the membrane-bound enzyme with phospholipase C did not destroy its ability to hydrolyse PNPP, ATP and pyrophosphate. The hydrolysis of ATP and PNPP by phosphatidylinositol-specific phospholipase C-released enzyme exhibited ‘Michaelian’ kinetics with K0.5=70 and 979 μM, respectively. For pyrophosphate, K0.5 was 128 μM and site-site interactions were observed (n=1.4). Magnesium ions were stimulatory (K0.5=1.5 mM) and zinc ions were a powerful noncompetitive inhibitor (Ki=6.2 μM) of phosphatidylinositol-specific phospholipase C-released enzyme.

Phosphatidylinositol-specific phospholipase C-released alkaline phosphatase was relatively stable at 40°C. However, with increasing temperature from 40–60°C, the enzyme was inactivated rapidly following first order kinetics and thermal inactivation constants varied from 5.08×10−4 min−1 to 0.684 min−1.

Treatment of phosphatydilinositol-specific phospholipase C-released alkaline phosphatase with Chellex 100 depleted to 5% its original PNPPase activity. Magnesium (K0.5=29.5 μM), manganese (K0.5=5 μM) and cobalt ions (K0.5=10.1 μM) restored the activity of Chelex-treated enzyme, demonstrating its metalloenzyme nature. The stimulation of Chelex-treated enzyme by calcium ions (K0.5=653 μM) was less effective (only 26%) and occurred with site-site interactions (n=0.7). Zinc ions had no stimulatory effects.

The possibility that the soluble form of the enzyme, detected during endochondral ossification, would arise by the hydrolysis of the P1-anchored form of osseous plate alkaline phosphatase is discussed.

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  1. Departamento de Química, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto-USP, Av. Bandeirantes 3900, 14040-901, Ribeirão Preto, SP, Brasil

    Pietro Ciancaglini & Francisco A. Leone

  2. Departamento de Tecnologia, Faculdade de Ciências Agrárias e Veterinárias de Jaboticabal-UNESP, Av. Bandeirantes 3900, 14040-901, Ribeirão Preto, SP, Brasil

    João M. Pizauro

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Pizauro, J.M., Ciancaglini, P. & Leone, F.A. Characterization of the phosphatidylinositol-specific phospholipase C-released form of rat osseous plate alkaline phosphatase and its possible significance on endochondral ossification. Mol Cell Biochem 152, 121–129 (1995). https://doi.org/10.1007/BF01076074

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