Molecular Cloning of Mevalonate Kinase and Regulation of its mRNA Levels in Rat Liver

Mevalonate kinase [ATP:(R)-mevalonate 5-phosphotransferase, EC 2.7.1.36] may be a regulatory site in the cholesterol biosynthetic pathway, and a mutation in the gene coding for this enzyme is thought to cause the genetic disease mevalonic aciduria. To characterize this enzyme, a rat liver cDNA libra...

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Veröffentlicht in:Proceedings of the National Academy of Sciences - PNAS 1990-04, Vol.87 (8), p.2872-2876
Hauptverfasser: Tanaka, Richard D., Lee, Lynn Y., Schafer, Beverly L., Kratunis, Valerie J., Mohler, William A., Robinson, Gordon W., Mosley, Stephen T.
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container_issue 8
container_start_page 2872
container_title Proceedings of the National Academy of Sciences - PNAS
container_volume 87
creator Tanaka, Richard D.
Lee, Lynn Y.
Schafer, Beverly L.
Kratunis, Valerie J.
Mohler, William A.
Robinson, Gordon W.
Mosley, Stephen T.
description Mevalonate kinase [ATP:(R)-mevalonate 5-phosphotransferase, EC 2.7.1.36] may be a regulatory site in the cholesterol biosynthetic pathway, and a mutation in the gene coding for this enzyme is thought to cause the genetic disease mevalonic aciduria. To characterize this enzyme, a rat liver cDNA library was screened with a monospecific antibody, and a 1.7-kilobase cDNA clone coding for mevalonate kinase was isolated. The complete DNA sequence was determined, and the longest open reading frame coded for a protein containing 395 amino acids with a deduced molecular weight of 41,990. Identification of the cDNA clone was confirmed by expression of enzyme activity in yeast and by protein sequence data obtained from sequencing purified rat mevalonate kinase. The deduced amino acid sequence of mevalonate kinase contained a motif for the ATP-binding site found in protein kinases, and it also showed sequence homology to the yeast RAR1 protein. The size of mevalonate kinase mRNA in rat liver was ≈ 2 kilobases. Treatment with diets containing cholesterol-lowering agents caused an increase in both mevalonate kinase activity and mRNA levels, whereas diets containing 5% cholesterol lowered the levels of both enzyme activity and mRNA. These data indicate that long-term regulation of enzyme activity in rat liver is controlled by changes in the levels of mevalonate kinase mRNA.
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To characterize this enzyme, a rat liver cDNA library was screened with a monospecific antibody, and a 1.7-kilobase cDNA clone coding for mevalonate kinase was isolated. The complete DNA sequence was determined, and the longest open reading frame coded for a protein containing 395 amino acids with a deduced molecular weight of 41,990. Identification of the cDNA clone was confirmed by expression of enzyme activity in yeast and by protein sequence data obtained from sequencing purified rat mevalonate kinase. The deduced amino acid sequence of mevalonate kinase contained a motif for the ATP-binding site found in protein kinases, and it also showed sequence homology to the yeast RAR1 protein. The size of mevalonate kinase mRNA in rat liver was ≈ 2 kilobases. Treatment with diets containing cholesterol-lowering agents caused an increase in both mevalonate kinase activity and mRNA levels, whereas diets containing 5% cholesterol lowered the levels of both enzyme activity and mRNA. 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1091-6490
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source MEDLINE; Jstor Complete Legacy; PubMed Central; Alma/SFX Local Collection; Free Full-Text Journals in Chemistry
subjects Amino Acid Sequence
Amino acids
Animals
Base Sequence
Cholesterols
Cloning, Molecular
Complementary DNA
DNA - genetics
DNA - isolation & purification
Enzymes
Female
Gene Expression
Gene expression regulation
Liver
Liver - enzymology
Messenger RNA
mevalonate kinase
Molecular Sequence Data
Nucleotides
Phosphotransferases (Alcohol Group Acceptor)
Phosphotransferases - genetics
Protein Conformation
Rats
Rats, Inbred Strains
RNA, Messenger - genetics
Saccharomyces cerevisiae - genetics
Sequence Homology, Nucleic Acid
Sequencing
Yeasts
title Molecular Cloning of Mevalonate Kinase and Regulation of its mRNA Levels in Rat Liver
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