Molecular identification of an arsenic four-gene operon in Campylobacter lari
Language English Country United States Media print-electronic
Document type Journal Article, Research Support, Non-U.S. Gov't
- MeSH
- Arsenic * MeSH
- Arsenate Reductases genetics MeSH
- Genes, Bacterial * MeSH
- RNA, Bacterial genetics MeSH
- Campylobacter lari genetics isolation & purification MeSH
- DNA, Bacterial genetics MeSH
- DNA Primers MeSH
- Genetic Loci MeSH
- Nucleic Acid Conformation MeSH
- Molecular Sequence Data MeSH
- Helix-Turn-Helix Motifs genetics MeSH
- Operon genetics MeSH
- Open Reading Frames MeSH
- Reverse Transcriptase Polymerase Chain Reaction MeSH
- Amino Acid Sequence MeSH
- Sequence Analysis, DNA MeSH
- Sequence Alignment MeSH
- Urease genetics MeSH
- Publication type
- Journal Article MeSH
- Research Support, Non-U.S. Gov't MeSH
- Names of Substances
- Arsenic * MeSH
- Arsenate Reductases MeSH
- RNA, Bacterial MeSH
- DNA, Bacterial MeSH
- DNA Primers MeSH
- Urease MeSH
An arsenic (ars) four-gene operon, containing genes encoding a putative membrane permease (ArsP), a transcriptional repressor (ArsR), an arsenate reductase (ArsC) and an arsenical-resistance membrane transporter (Acr3) was first identified in urease-positive thermophilic Campylobacter (UPTC) isolate, CF89-12. UPTC CF89-12 and some other Campylobacter lari isolates contained their ars four-genes, similarly, differing from that in the reference C. lari RM2100 strain. Two putative promoters and a putative terminator were identified for the operon in UPTC CF89-12. In vivo transcription of the operon was confirmed in the UPTC cells. PCR experiments using two primer pairs designed in silico to amplify two arsR and arsC-acr3 segments, respectively, generated two amplicons, approximately 200 and 350 base pairs, with all 31 of 31 and 19 of 31 C. lari isolates (n = 17 for UPTC; n = 14 for UN C. lari), respectively. An inverted repeat forming a dyad structure, a potential binding site for a transcriptional repressor, was identified in the promoter region. Within the deduced 61 amino acids sequence of the putative arsR open reading frame from the UPTC CF89-12, a metal binding box and a DNA-binding helix-turn-helix motif were identified. The UPTC CF89-12 and some other UPTC isolates isolated from natural environment were resistant to arsenate.
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