Title: Factors that regulate the activity of the phosphatidylinositol kinase present in oocyte membranes of Xenopus laevis
Abstract: 1. Phosphatidylinositol kinase present in the membranes of Xenopus laevis oocytes was characterized. 2. The enzyme requires Mg2+ or Mn2+ at 10 mM and exogenous phosphatidylinositol (50 μM) increases the formation of phosphatidylinositol-4-phosphate. 3. The oocyte phosphatidylinositol kinase cannot use GTP as a phosphate donor but this compound inhibits competitively the utilization of ATP. 4. Addition of phosphatidylserine and phosphatidylinositol-4,5-bisphosphate stimulates the phosphorylation of phosphatidylinositol but 2,3-bisphosphoglycerate at 5 mM concentration is a strong inhibitor of the reaction.
Publication Year: 1989
Publication Date: 1989-01-01
Language: en
Type: article
Indexed In: ['crossref', 'pubmed']
Access and Citation
Cited By Count: 2
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