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FEBS Lett. 1990 Dec 17;277(1-2):137-40.

Tautomycin from the bacterium Streptomyces verticillatus. Another potent and specific inhibitor of protein phosphatases 1 and 2A.

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Department of Biochemistry, University of Dundee, Scotland, UK.


Tautomycin inhibited the catalytic subunits of protein phosphatase-1 (Kiapp = 0.16 nM) more potently than protein phosphatase 2A (Kiapp = 0.4 nM), and the native forms of these enzymes in mammalian, protozoan and plant extracts were inhibited in a similar manner. Protein phosphatase 2B was inhibited 10,000-fold less potently, while two other phosphatases and six protein kinases were unaffected at 10 microM. Okadaic acid prevented the binding of tautomycin to protein phosphatase 2A, indicating a common binding site for both inhibitors. The different relative potencies of tautomycin and okadaic acid for protein phosphatases 1 and 2A suggest that parallel use of both inhibitors may help to identify physiological substrates for each enzyme.

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