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Identification, cloning, and nucleotide sequencing of the ornithine decarboxylase antizyme gene of Escherichia coli.

ABSTRACT: The ornithine decarboxylase antizyme gene of Escherichia coli was identified by immunological screening of an E. coli genomic library. A 6.4-kilobase fragment containing the antizyme gene was subcloned and sequenced. The open reading frame encoding the antizyme was identified on the basis of its ability to direct the synthesis of immunoreactive antizyme. Antizyme shares significant homology with bacterial transcriptional activators of the two-component regulatory system family; these systems consist of a "sensor" kinase and a transcriptional regulator. The open reading frame next to antizyme is homologous to sensor kinases. Antizyme overproduction inhibits the activities of both ornithine and arginine decarboxylases without affecting their protein levels. Extracts from E. coli bearing an antizyme gene-containing plasmid exhibit increased antizyme activity. These data strongly suggest that (i) the cloned gene encodes the ornithine decarboxylase antizyme and (ii) antizyme is a bifunctional protein serving as both an inhibitor of polyamine biosynthesis as well as a transcriptional regulator of an as yet unknown set of genes.

SUBMITTER: Canellakis ES

PROVIDER: S-EPMC47089 | biostudies-other | 1993 Aug

REPOSITORIES: biostudies-other

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Identification, cloning, and nucleotide sequencing of the ornithine decarboxylase antizyme gene of Escherichia coli.

Canellakis E S ES Paterakis A A AA Huang S C SC Panagiotidis C A CA Kyriakidis D A DA

Proceedings of the National Academy of Sciences of the United States of America 19930801 15

The ornithine decarboxylase antizyme gene of Escherichia coli was identified by immunological screening of an E. coli genomic library. A 6.4-kilobase fragment containing the antizyme gene was subcloned and sequenced. The open reading frame encoding the antizyme was identified on the basis of its ability to direct the synthesis of immunoreactive antizyme. Antizyme shares significant homology with bacterial transcriptional activators of the two-component regulatory system family; these systems con ...[more]

PMID: 8346225

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Project description:The antizyme family is a group of small proteins that play a role in cell growth and division by regulating the biosynthesis of polyamines (putrescine, spermidine, spermine). Antizymes regulate polyamine levels primarily through binding ornithine decarboxylase (ODC), an enzyme key to polyamine production, and targeting ODC for destruction by the 26S proteosome. Ornithine decarboxylase antizyme 3 (OAZ3) is a testis-specific antizyme paralog and the only antizyme expressed in the mid to late stages of spermatogenesis.To see if mutations in the OAZ3 gene are responsible for some cases of male infertility, we sequenced and evaluated the genomic DNA of 192 infertile men, 48 men of known paternity, and 34 African aborigines from the Mbuti tribe in the Democratic Republic of the Congo. The coding sequence of OAZ3 was further screened for polymorphisms by SSCP analysis in the infertile group and an additional 250 general population controls. Identified polymorphisms in the OAZ3 gene were further subjected to a haplotype analysis using PHASE 2.02 and Arlequin 2.0 software programs.A total of 23 polymorphisms were identified in the promoter, exons or intronic regions of OAZ3. The majority of these fell within a region of less than two kilobases. Two of the polymorphisms, -239 A/G in the promoter and 4280 C/T, a missense polymorphism in exon 5, may show evidence of association with male infertility. Haplotype analysis identified 15 different haplotypes, which can be separated into two divergent clusters.Mutations in the OAZ3 gene are not a common cause of male infertility. However, the presence of the two divergent haplotypes at high frequencies in all three of our subsamples (infertile, control, African) suggests that they have been maintained in the genome by balancing selection, which was supported by a test of Tajima's D statistic. Evidence for natural selection in this region implies that these haplotypes may be associated with a trait other than infertility. This trait may be related to another function of OAZ3 or a region in tight linkage disequilibrium to the gene.

Dataset Information

Identification, cloning, and nucleotide sequencing of the ornithine decarboxylase antizyme gene of Escherichia coli.

Publications

Identification, cloning, and nucleotide sequencing of the ornithine decarboxylase antizyme gene of Escherichia coli.

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