PubMed:6325440 JSONTXT

{"target":"https://pubannotation.org/docs/sourcedb/PubMed/sourceid/6325440","sourcedb":"PubMed","sourceid":"6325440","source_url":"http://www.ncbi.nlm.nih.gov/pubmed/6325440","text":"In vitro phosphorylation of tropomyosin by a kinase from chicken embryo.\nA tropomyosin kinase has been partially purified from the leg muscle of 11-day-old chick embryos by ammonium sulfate precipitation and DEAE and phosphocellulose chromatography. The tropomyosin kinase requires Mg2+ for its activity, but Ca2+ and cyclic AMP are not needed. Increase in KC1 concentration decreased the tropomyosin kinase activity with over 90% inhibition at 0.2 M KC1. The alpha-tropomyosin subunit from rabbit and chicken skeletal muscle was phosphorylated about five times faster than the beta-tropomyosin subunit. Smooth muscle tropomyosin from chicken gizzard was not phosphorylated. The in vitro phosphorylation site in rabbit and chicken skeletal tropomyosins is a single serine residue close to the COOH terminus, a region intimately engaged in the head to tail polymerization of tropomyosin. Since the amino acid sequences of rabbit alpha- and beta-tropomyosin and chicken alpha-tropomyosin in this region are known, their phosphorylation sites can be unambiguously assigned as the penultimate residue, serine 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