Purification of Phosphoinositol Kinase from Suspension-cultured Cells of Rice (<i>Oryza sativa</i>L.)

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  • Purification of Phosphoinositol Kinase from Suspension-cultured Cells of Rice (Oryza sativa L.).

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Phosphoinositol kinase was purified from suspension-cultured rice (Oryza sativa L. ) cells. The apparent molecular mass of the rice enzyme was estimated to be 58kDa by SDS-PAGE and 234kDa by Toyopearl HW-55S gel filtration, indicating that it is a tetrameric enzyme. The enzyme absolutely required Mg2+ for the activity, but Mn2 + and Ca2 + did not affect it. In addition, this kinase phosphorylated inositol monophosphate to phytate. Judging from these data, rice phosphoinositol kinase was concluded to be a different enzyme distinguished from the other plant phosphoinositol kinases.

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