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J. Biol. Chem., Vol. 265, Issue 31, 18833-18842, 11, 1990
S Meresse, T Ludwig, R Frank and B Hoflack
Cell Biology Program, European Molecular Biology Laboratory, Heidelberg, Federal Republic of Germany.
A kinase activity of purified bovine brain clathrin-coated vesicles phosphorylates the bovine cation-independent mannose 6-phosphate receptor (CI-MPR) with high efficiency (Km approximately 50-100 nM). The kinase copurifies in gel filtration, adsorption on hydroxylapatite, and ion exchange chromatography with the HAI assembly proteins which are part of the coat of Golgi-derived clathrin-coated vesicles. The kinase is associated to the 47-kDa subunit of the complex and exhibits properties similar to a casein kinase II: it uses either ATP or GTP as substrate and its activity is stimulated by poly-L-lysine and inhibited by heparin. Using different domains of the CI-MPR as potential substrates, we show that the phosphorylation is restricted to its cytoplasmic domain. Inhibition studies using synthetic peptides and two- dimensional mapping of the tryptic phosphopeptides indicate that this posttranslational modification occurs on serines 2421 and 2492 of the full-length bovine CI-MPR precursor, residues which are located in typical casein-kinase II recognition sequences. Labeling of Madin-Darby bovine kidney cells followed by immunoprecipitation of the CI-MPR and analysis of the corresponding tryptic phosphopeptides shows that the same serines are phosphorylated in vivo.
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