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A tropomyosin-binding protein (app. M r 17000) was detected in equine platelet preparations by a gel overlay technique. Its isolation, amino acid and partial sequence analyses have shown it to be histone H2B. As with a similar protein from pig platelet preparations [der Terrossian (1983) FEBS Lett. 152, 202-206], it inhibits Mg 2+ -dependent actomyosin S1 ATPase. This inhibition...
Conventional smooth muscle myosin preparations contain a tightly bound myosin light chain kinase activity, which is incompletely removed by gel filtration at high ionic strength. We show here that by contrast, this kinase activity is released, together with calmodulin, under conditions in which myosin is in the folded configuration. The conformation-related release of kinase occurred for dephosphorylated...
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