Cloning and characterization of the gene encoding the IDH1 subunit of NAD+-dependent isocitrate dehydrogenase from Saccharomyces cerevisiae

Jill R. Cupp, Lee McAlister-Henn

Research output: Contribution to journalArticle

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Abstract

NAD+-dependent isocitrate dehydrogenase from Saccharomyces cerevisiae is composed of two nonidentical subunits, designated IDH1 and IDH2. The gene encoding IDH2 was previously cloned and sequenced (Cupp, J. R., and McAlister-Henn, L. (1991) J. Biol. Chem. 266, 22199-22205), and in this paper we describe the isolation of a yeast genomic clone containing the IDH1 gene. A fragment of the IDH1 gene was amplified by the polymerase chain reaction method utilizing degenerate oligonucleotides based on tryptic peptide sequences of the purified subunit; this fragment was used to isolate a full length IDH1 clone. The nucleotide sequence of the IDH1 coding region was determined and encodes a 360-residue polypeptide including an 11-residue mitochondrial targeting presequence. Amino acid sequence comparison between IDH1 and IDH2 reveals a 42% sequence identity, and both IDH1 and IDH2 show ∼32% identity to Escherichia coli NAD(P)+-dependent isocitrate dehydrogenase. To examine the function of the IDH1 subunit and to determine the metabolic role of NAD+-dependent isocitrate dehydrogenase the IDH1 gene was disrupted in a wild type haploid yeast strain and in a haploid strain lacking IDH2. The IDH1 disruption strains expressed no detectable IDH1 as determined by Western blot analysis, and these strains were found to lack NAD+-dependent isocitrate dehydrogenase activity indicating that IDH1 is essential for a functional enzyme. Over-expression of IDH1 in a strain containing IDH2 restored wild type activity but did not result in increased levels of activity, suggesting that both IDH1 and IDH2 are required for a functional enzyme. Growth phenotype analysis of the IDH1 disruption strains revealed that they grew at a reduced rate on the nonfermentable carbon sources examined (glycerol, lactate, and acetate), consistent with NAD+-dependent isocitrate dehydrogenase performing a critical role in oxidative function of the citric acid cycle. In addition, the IDH1 disruption strains grew at wild type rates in the absence of glutamate, indicating that these strains are not glutamate auxotrophs.

Original languageEnglish (US)
Pages (from-to)16417-16423
Number of pages7
JournalJournal of Biological Chemistry
Volume267
Issue number23
StatePublished - Aug 15 1992
Externally publishedYes

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Isocitrate Dehydrogenase
Gene encoding
Cloning
NAD
Yeast
Saccharomyces cerevisiae
Organism Cloning
Genes
Haploidy
Glutamic Acid
Clone Cells
Yeasts
Peptides
Citric Acid Cycle
Enzymes
Oligonucleotides
Glycerol
Amino Acid Sequence
Lactic Acid
Acetates

ASJC Scopus subject areas

  • Biochemistry

Cite this

Cloning and characterization of the gene encoding the IDH1 subunit of NAD+-dependent isocitrate dehydrogenase from Saccharomyces cerevisiae. / Cupp, Jill R.; McAlister-Henn, Lee.

In: Journal of Biological Chemistry, Vol. 267, No. 23, 15.08.1992, p. 16417-16423.

Research output: Contribution to journalArticle

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abstract = "NAD+-dependent isocitrate dehydrogenase from Saccharomyces cerevisiae is composed of two nonidentical subunits, designated IDH1 and IDH2. The gene encoding IDH2 was previously cloned and sequenced (Cupp, J. R., and McAlister-Henn, L. (1991) J. Biol. Chem. 266, 22199-22205), and in this paper we describe the isolation of a yeast genomic clone containing the IDH1 gene. A fragment of the IDH1 gene was amplified by the polymerase chain reaction method utilizing degenerate oligonucleotides based on tryptic peptide sequences of the purified subunit; this fragment was used to isolate a full length IDH1 clone. The nucleotide sequence of the IDH1 coding region was determined and encodes a 360-residue polypeptide including an 11-residue mitochondrial targeting presequence. Amino acid sequence comparison between IDH1 and IDH2 reveals a 42{\%} sequence identity, and both IDH1 and IDH2 show ∼32{\%} identity to Escherichia coli NAD(P)+-dependent isocitrate dehydrogenase. To examine the function of the IDH1 subunit and to determine the metabolic role of NAD+-dependent isocitrate dehydrogenase the IDH1 gene was disrupted in a wild type haploid yeast strain and in a haploid strain lacking IDH2. The IDH1 disruption strains expressed no detectable IDH1 as determined by Western blot analysis, and these strains were found to lack NAD+-dependent isocitrate dehydrogenase activity indicating that IDH1 is essential for a functional enzyme. Over-expression of IDH1 in a strain containing IDH2 restored wild type activity but did not result in increased levels of activity, suggesting that both IDH1 and IDH2 are required for a functional enzyme. Growth phenotype analysis of the IDH1 disruption strains revealed that they grew at a reduced rate on the nonfermentable carbon sources examined (glycerol, lactate, and acetate), consistent with NAD+-dependent isocitrate dehydrogenase performing a critical role in oxidative function of the citric acid cycle. In addition, the IDH1 disruption strains grew at wild type rates in the absence of glutamate, indicating that these strains are not glutamate auxotrophs.",
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