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Plasmid. 2013 Nov;70(3):343-52. doi: 10.1016/j.plasmid.2013.07.006. Epub 2013 Aug 8.

Entire sequence of the colonization factor coli surface antigen 6-encoding plasmid pCss165 from an enterotoxigenic Escherichia coli clinical isolate.

Author information

1
Research Institute, National Center for Global Health and Medicine, 1-21-1, Toyama, Shinjuku, Tokyo 162-8655, Japan; Graduate School of Comprehensive Human Sciences, University of Tsukuba, 1-1-1, Tennodai, Tsukuba, Ibaraki 305-8577, Japan.

Abstract

Coli surface antigen 6 (CS6) is one of the most prevalent colonization factors among enterotoxigenic Escherichia coli (ETEC) isolated in developing countries. Although it is known that CS6 is encoded by a plasmid, there are no reports on the sequence analysis of the CS6-encoding plasmid or genes exhibiting similar behavior to CS6. Here, we report the isolation of the CS6-encoding plasmid, pCss165Kan, from 4266 ΔcssB::kanamycin (Km) and its complete nucleotide sequence. This plasmid consisted of 165,311bp and 222 predicted coding sequences. Remarkably, there were many insertion sequence (IS) elements, which comprised 24.4% of the entire sequence. Virulence-associated genes such as heat-stable enterotoxin, homologues of ATP-binding cassette transporter in enteroaggregative E. coli (EAEC), and ETEC autotransporter A were also present, although the ETEC autotransporter A gene was disrupted by the integration of IS629. We found that 2 transcriptional regulators belonging to the AraC family were not involved in CS6 expression. Interestingly, pCss165 had conjugative transfer genes, as well as 3 toxin-antitoxin systems that potentially exclude other plasmid-free host bacteria. These genes might be involved in the prevalence of CS6 among ETEC isolates.

KEYWORDS:

BLAST; CDSs; CFA; CFs; CS; CS6; Colonization factor; DIG; Enterotoxigenic Escherichia coli; IS; Km and Kan; PBS; PHD; ST; Virulence plasmid; basic local alignment search tool; coding sequences; coli surface antigen; colonization factor antigen; colonization factors; digoxigenin; heat-stable enterotoxin; insertion sequence; kanamycin; phosphate buffered saline; prevent host death

PMID:
23933356
DOI:
10.1016/j.plasmid.2013.07.006
[Indexed for MEDLINE]

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