A novel protein phosphatase inhibitor, tautomycin Effect on smooth muscle

Open Access
Publisher Website
Google Scholar
Abstract
The antibiotic, tautomycin, was found to be a potent inhibitor of protein phosphatases and equally effective for the type‐1 and type‐2A enzymes. For the catalytic subunits of the type‐1 and type‐2A phosphatases the IC50 value was 22 to 32 nM. For the phosphatase activity present in chicken gizzard actomyosin the IC50 value was 6 nM. Tautomycin had no effect on myosin light chain kinase activity. Tautomycin induced a Ca2+‐independent contraction of intact and permeabilized smooth muscle fibers and this was accompanied by an increase in the level of myosin phosphorylation. Thus, tautomycin by virtue of its ability to inhibit phosphatase activity is a valuable addition for studying the role of protein phosphorylation.