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IUPAC name
[(1R,2R,3R,6S,7S,10R)-10-[(2S,3S,6R,8S,9R)-3,9-dimethyl-8-[(3S)-3-methyl-4-oxo-pentyl]-1,7-dioxaspiro[5.5]undecan-2-yl]-3,7-dihydroxy-1-isopropyl-2-methoxy-6-methyl-5-oxo-undecyl] (3R)-3-hydroxy-3-(4-methyl-2,5-dioxo-3-furyl)propanoate
ChEMBL ChEMBL505512 YesY
ChemSpider 389529 YesY
Jmol 3D model Interactive image
PubChem 440646
Molar mass 766.95
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

Tautomycin is a chemical that occurs naturally in shellfish and is produced by the bacterium Streptomyces spiroverticillatus. It is a polyketide-based structure characterized by a three hydroxyl groups, two ketones, a dialkylmaleic anhydride, an ester linkage (connecting anhydride unit to polyketide chain), a spiroketal and one methyl ether among others.


It is a very potent inhibitor of the protein phosphatases PP1 and PP2A. Tautomycin demonstrates a slight preference for PP1 inhibition relative to PP2A inhibition. Tautomycin is closely related to another anhydride containing polyketide PP inhibitor called Tautomycetin which, in addition to being useful as a lead for cancer drug discovery, also is a very potent immunosuppressor. The mechanism of immunosuppression by Tautomycetin differs from that of more classical immunosuppressors such as rapamycin and tacrolimus.