US EPA

1337530 

Journal Article 

Molecular identification of an arsenic four-gene operon in Campylobacter lari 

Nakajima, T; Hayashi, K; Nagatomi, R; Matsubara, K; Moore, JE; Millar, BC; Matsuda, MM 

2013 

Yes 

Folia Microbiologica
ISSN: 0015-5632
EISSN: 1874-9356 

58 

3 

253-260 

English 

23132657 

10.1007/s12223-012-0207-5 

WOS:000317976600011 

http://link.springer.com/10.1007/s12223-012-0207-5
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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.