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• W2079486812 abstract "Molecular cloning has provided evidence for a new family of protein kinases in eukaryotic cells. These kinases show no sequence similarity with other eukaryotic protein kinases, but are related by sequence to the histidine protein kinases found in prokaryotes. These protein kinases, responsible for phosphorylation and inactivation of the branched-chain alpha-ketoacid dehydrogenase and pyruvate dehydrogenase complexes, are located exclusively in mitochondrial matrix space and have most likely evolved from genes originally present in respiration-dependent bacteria endocytosed by primitive eukaryotic cells. Long-term regulatory mechanisms involved in the control of the activities of these two kinases are of considerable interest. Dietary protein deficiency increases the activity of branched-chain alpha-ketoacid dehydrogenase kinase associated with the branched-chain alpha-ketoacid dehydrogenase complex. The amount of branched-chain alpha-ketoacid dehydrogenase kinase protein associated with the branched-chain alpha-ketoacid dehydrogenase complex and the message level for branched-chain alpha-ketoacid dehydrogenase kinase are both greatly increased in the liver of rats starved for protein, suggesting increased expression of the gene encoding branched-chain alpha-ketoacid dehydrogenase kinase. The increase in branched-chain alpha-ketoacid dehydrogenase kinase activity results in greater phosphorylation and lower activity of the branched-chain alpha-ketoacid dehydrogenase complex. The metabolic consequence is conservation of branched chain amino acids for protein synthesis during periods of dietary protein deficiency. Two isoforms of pyruvate dehydrogenase kinase have been identified and cloned. Pyruvate dehydrogenase kinase 1, the first isoform cloned, corresponds to the 48 kDa subunit of the pyruvate dehydrogenase kinase isolated from rat heart tissue. Pyruvate dehydrogenase kinase 2, the second isoform cloned, corresponds to the 45 kDa subunit of this enzyme. In addition, it also appears to correspond to a possibly free or soluble form of pyruvate dehydrogenase kinase that was originally named kinase activator protein. Assuming that differences in kinetic and/or regulatory properties of these isoforms exist, tissue specific expression of these enzymes and/or control of their association with the complex will probably prove to be important for the long term regulation of the activity of the pyruvate dehydrogenase complex. Starvation and the diabetic state are known to greatly increase activity of the pyruvate dehydrogenase kinase in the liver, heart and muscle of the rat. This contributes in these states to the phosphorylation and inactivation of the pyruvate dehydrogenase complex and conservation of pyruvate and lactate for gluconeogenesis.(ABSTRACT TRUNCATED AT 400 WORDS)" @default.
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• W2079486812 date "1995-01-01" @default.
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• W2079486812 title "A new family of protein kinases— The mitochondrial protein kinases" @default.
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• W2079486812 doi "https://doi.org/10.1016/0065-2571(94)00020-4" @default.
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