Abstract
A low molecular weight (LMW) protein phosphokinase enzyme that binds to actin has been isolated from murine sarcoma virions; this kinase activity is not present in nontransforming murine leukemia viruses. Sephadex G-75 gel filtration and affinity chromatography on actin-Sepharose conjugates allow a significant level of purification of this enzyme. The enzyme associates with microtubular proteins and inhibits the in vitro polymerization of microtubules. This study represents the first isolation of a sarcoma virus-associated protein that possesses the ability to interact directly with two major components of the cytoskeletal system.
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