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  • Title: Identification of the site phosphorylated by casein kinase II in smooth muscle caldesmon.
    Author: Wawrzynow A, Collins JH, Bogatcheva NV, Vorotnikov AV, Gusev NB.
    Journal: FEBS Lett; 1991 Sep 09; 289(2):213-6. PubMed ID: 1915849.
    Abstract:
    Phosphorylation of avian gizzard caldesmon by casein kinase II was investigated. The enzyme incorporates about 1 mol of phosphate per mol of caldesmon. All sites of phosphorylation are located in short chymotryptic peptides with Mr 25-27 kDa or in the short N-terminal peptide formed after cleavage of chicken gizzard caldesmon at Cys153. The primary structure of the tryptic peptide containing the main site of duck gizzard caldesmon phosphorylation is S-E-V-N-A-Q-N-X-V-A-E-D-E-T-K, where X is an unidentified residue, presumed to be phosphoserine. Thus, Ser73 is the main site phosphorylated by casein kinase II in avian gizzard caldesmon.
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