Isolation and purification of a new 105 kDa protein kinase from rat liver nuclei.
A protein kinase was purified from rat liver nuclei by affinity chromatography on poly(L-lysine)-agarose and protein kinase inhibitor-Sepharose 4B columns. The relative molecular weight of this protein kinase is 105000 (determined by 10% SDS-polyacrylamide slab gel electrophoresis, gel filtration on Sephadex G-200 and sedimentation velocity ultracentrifugation). Its pH optimum is between 8.0 and 9.0. It is active over a wide range of mg2+ concentrations, and its activity is stimulated by several small acidic proteins (calmodulin, lactalbumin, parvalbumin, protein kinase inhibitor and troponin C). The enzyme phosphorylates a variety of substrates including casein, histones, protamine and the synthetic basic polypeptides, poly(L-arginine) and poly(L-lysine).
D000255:Adenosine Triphosphate / Q000378:metabolism; D000818:Animals; D002413:Cations, Divalent / Q000494:pharmacology; D002467:Cell Nucleus / Q000201:enzymology; D002846:Chromatography, Affinity / Q000379:methods; D002850:Chromatography, Gel; D002852:Chromatography, Ion Exchange; D008099:Liver / Q000201:enzymology*; D008297:Male; D008970:Molecular Weight; D011107:Polylysine; D011494:Protein Kinases / Q000302:isolation & purification*; D051381:Rats; D011919:Rats, Inbred Strains
D002413:Cations, Divalent; D011107:Polylysine; D000255:Adenosine Triphosphate; D011494:Protein Kinases