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• W2017004060 abstract "Acanthamoeba myosin I heavy chain (MIHC) kinase is a monomeric 97-kDa protein that is activated by binding to acidic phospholipids or by autophosphorylation. Activation by phospholipids is inhibited by Ca2+-calmodulin. In the accompanying paper (Brzeska, H., Martin, B., and Korn, E. D. (1996) J. Biol. Chem. 271, 27049-27055), we identified the catalytic domain as the COOH-terminal 35 kDa produced by trypsin digestion of phosphorylated MIHC kinase. In this paper, we report the cloning and sequencing of the corresponding cDNA and expression of fully active catalytic domain. The expressed catalytic domain has substrate specificity similar to that of native kinase and resistance to trypsin similar to that of fully phosphorylated MIHC kinase. MIHC kinase catalytic domain has only 25% sequence identity to the catalytic domain of protein kinase A and similarly low sequence identity to the catalytic domains of protein kinase C- and calmodulin-dependent kinases, but 50% sequence identity and 70% similarity to the p21-activated kinase (PAK) and STE20 family of kinases. This suggests that MIHC kinase is (at least) evolutionarily related to the PAK family, whose activities are regulated by small GTP-binding proteins. The homology includes the presence of a potential MIHC kinase autophosphorylation site as well as conserved Tyr and Ser/Thr residues in the region corresponding to the P+1 loop of protein kinase A. A synthetic peptide corresponding to this region of MIHC kinase is phosphorylated by both the expressed catalytic domain and native MIHC kinase. Acanthamoeba myosin I heavy chain (MIHC) kinase is a monomeric 97-kDa protein that is activated by binding to acidic phospholipids or by autophosphorylation. Activation by phospholipids is inhibited by Ca2+-calmodulin. In the accompanying paper (Brzeska, H., Martin, B., and Korn, E. D. (1996) J. Biol. Chem. 271, 27049-27055), we identified the catalytic domain as the COOH-terminal 35 kDa produced by trypsin digestion of phosphorylated MIHC kinase. In this paper, we report the cloning and sequencing of the corresponding cDNA and expression of fully active catalytic domain. The expressed catalytic domain has substrate specificity similar to that of native kinase and resistance to trypsin similar to that of fully phosphorylated MIHC kinase. MIHC kinase catalytic domain has only 25% sequence identity to the catalytic domain of protein kinase A and similarly low sequence identity to the catalytic domains of protein kinase C- and calmodulin-dependent kinases, but 50% sequence identity and 70% similarity to the p21-activated kinase (PAK) and STE20 family of kinases. This suggests that MIHC kinase is (at least) evolutionarily related to the PAK family, whose activities are regulated by small GTP-binding proteins. The homology includes the presence of a potential MIHC kinase autophosphorylation site as well as conserved Tyr and Ser/Thr residues in the region corresponding to the P+1 loop of protein kinase A. A synthetic peptide corresponding to this region of MIHC kinase is phosphorylated by both the expressed catalytic domain and native MIHC kinase." @default.
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• W2017004060 date "1996-10-01" @default.
• W2017004060 modified "2023-10-14" @default.
• W2017004060 title "The Catalytic Domain of Acanthamoeba Myosin I Heavy Chain Kinase" @default.
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• W2017004060 doi "https://doi.org/10.1074/jbc.271.43.27056" @default.
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