Inhibition of phosphatidylinositol kinase by toyocamycin.

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Inhibition of phosphatidylinositol kinase by toyocamycin.

We have screened toyocamycin as an inhibitor of phosphatidylinositol kinase. It inhibited the enzyme of A431 cell membrane with an IC50 of 3.3 micrograms/ml. Adenosine and formycin A also inhibited the enzyme, but other 6 related nucleosides did not. Although orobol and 2,3-dihydroxybenzaldehyde that inhibit phosphatidylinositol kinase inhibited in situ phosphatidylinositol turnover, toyocamyci...

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Inhibition of lymphocyte kinase Lck and phosphatidylinositol 3-kinase by a novel immunosuppressant, lymphostin.

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Inhibition of the signalling enzyme phosphatidylinositol-3-kinase by antitumor ether lipid analogues.

Phosphatidylinositol-3-kinase (PtdIns-3-kinase) is an enzyme found associated with many growth factor receptor protein tyrosine kinases and oncogene protein tyrosine kinases. PtdIns-3-kinase appears to be important for mitogenesis and the malignant transformation of cells. The antitumor ether lipid analogue, 1-O-octadecyl-2-O-methyl-rac-glycero-3-phosphocholine (ET-18-OCH3), was found to be an ...

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Inhibition of neuroblastoma cell phosphatidylinositol 3-kinase by CDP-diacylglycerol and phosphatidate.

Phosphatidylinositol (PI) 3-kinase is activated by a variety of agents, including various growth factors, and has been proposed to play a role in initiation of cell growth, proliferation, and differentiation. We here investigate the effect of various membrane lipids on PI 3-kinase immunopurified from human SH-SY5Y neuroblastoma cells. CDP-diacylglycerol (CDP-DAG) inhibited PI 3-kinase activity ...

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Inhibition of ribosomal RNA maturation in Novikoff hepatoma cells by toyocamycin, tubercidin, and 6-thioguanosine.

The purine nucleoside analogs, toyocamycin, tubercidin, and 6-thioguanosine, all inhibit ribosomal RNA maturation in cultured Novikoff hepatoma cells. While processing of the 45 S RNA to the 38 S RNA continues, formation of the mature 28 S RNA and the mature 18 S RNA is markedly inhibited by the addition of any of the analogs. Labeling of the 32 S RNA intermediate precursor is inhibited to a le...

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ژورنال

عنوان ژورنال: The Journal of Antibiotics

سال: 1990

ISSN: 0021-8820,1881-1469

DOI: 10.7164/antibiotics.43.1586