Abstract
Several bovine brain proteins have been found to interact with a hydrophobic chromatography resin (phenyl-Sepharose CL-4B) in a Ca2+-dependent manner. These include calmodulin, the Ca2+/phospholipid-dependent protein kinase (protein kinase C) and a novel Ca2+-binding protein that has now been purified to electrophoretic homogeneity. This latter protein is acidic (pI 5.1) and, like calmodulin and some other high-affinity Ca2+-binding proteins, exhibits a Ca2+-dependent mobility shift on sodium dodecyl sulphate/polyacrylamide-gel electrophoresis, with an apparent Mr of 22 000 in the absence of Ca2+ and Mr 21 000 in the presence of Ca2+. This novel calciprotein is distinct from known Ca2+-binding proteins on the basis of Mr under denaturing conditions, Cleveland peptide mapping and amino acid composition analysis. It may be a member of the calmodulin superfamily of Ca2+-binding proteins. This calciprotein does not activate two calmodulin-dependent enzymes, namely cyclic nucleotide phosphodiesterase and myosin light-chain kinase, nor does it have any effect on protein kinase C. It may be a Ca2+-dependent regulatory protein of an as-yet-undefined enzymic activity. The Ca2+/phospholipid-dependent protein kinase is also readily purified by Ca2+-dependent hydrophobic-interaction chromatography followed by ion-exchange chromatography, during which it is easily separated from calmodulin. A preparation of protein kinase C that lacks contaminating kinase or phosphatase activities is thereby obtained rapidly and simply. Such a preparation is ideal for the study of phosphorylation reactions catalysed in vitro by protein kinase C.
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