Cloning and sequence analysis of a cDNA for 3-hydroxyisobutyrate dehydrogenase. Evidence for its evolutionary relationship to other pyridine nucleotide-dependent dehydrogenases

P. M. Rougraff, B. Zhang, M. J. Kuntz, R. A. Harris, D. W. Crabb

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A 1.7-kilobase pair cDNA clone encoding 3-hydroxyisobutyrate dehydrogenase has been isolated by screening a rat liver λgt11 library with a 17-base oligonucleotide probe which corresponds to a portion of the N-terminal amino acid sequence of rabbit liver 3-hydroxyisobutyrate dehydrogenase. The cDNA contains an open reading frame of 1038 base pairs which includes an amino acid sequence that matches the N-terminal 35 amino acid sequence of rabbit 3-hydroxyisobutyrate dehydrogenase at 33 residues. The cDNA predicts a 300-amino acid mature protein with an amino acid composition and molecular weight very similar to that of rabbit liver 3-hydroxyisobutyrate dehydrogenase. Northern blot analysis of total RNA from several rat tissues shows an mRNA of approximately 2.0 kilobase pairs in each tissue. Relative mRNA levels were: kidney > liver = heart muscle. The amino acid sequence of 3-hydroxyisobutyrate dehydrogenase shows similarity to several other pyridine nucleotide-dependent dehydrogenases. The resemblance to malate and lactate dehydrogenases suggests that the nucleotide-binding domain is located in the N-terminal region of the protein.

Original languageEnglish (US)
Pages (from-to)5899-5903
Number of pages5
JournalJournal of Biological Chemistry
Issue number10
StatePublished - Jan 1 1989


ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Cell Biology

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