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Kutter EM, Skutt-Kakaria K, Blasdel B, El-Shibiny A, Castano A, Bryan D, Kropinski AM, Villegas A, Ackermann HW, Toribio AL, Pickard D, Anany H, Callaway T, Brabban AD. Characterization of a ViI-like phage specific to Escherichia coli O157:H7. Virol J 2011; 8:430. [PMID: 21899740 PMCID: PMC3184105 DOI: 10.1186/1743-422x-8-430] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2011] [Accepted: 09/07/2011] [Indexed: 12/16/2022] Open
Abstract
Phage vB_EcoM_CBA120 (CBA120), isolated against Escherichia coli O157:H7 from a cattle feedlot, is morphologically very similar to the classic phage ViI of Salmonella enterica serovar Typhi. Until recently, little was known genetically or physiologically about the ViI-like phages, and none targeting E. coli have been described in the literature. The genome of CBA120 has been fully sequenced and is highly similar to those of both ViI and the Shigella phage AG3. The core set of structural and replication-related proteins of CBA120 are homologous to those from T-even phages, but generally are more closely related to those from T4-like phages of Vibrio, Aeromonas and cyanobacteria than those of the Enterobacteriaceae. The baseplate and method of adhesion to the host are, however, very different from those of either T4 or the cyanophages. None of the outer baseplate proteins are conserved. Instead of T4's long and short tail fibers, CBA120, like ViI, encodes tail spikes related to those normally seen on podoviruses. The 158 kb genome, like that of T4, is circularly permuted and terminally redundant, but unlike T4 CBA120 does not substitute hmdCyt for cytosine in its DNA. However, in contrast to other coliphages, CBA120 and related coliphages we have isolated cannot incorporate 3H-thymidine (3H-dThd) into their DNA. Protein sequence comparisons cluster the putative "thymidylate synthase" of CBA120, ViI and AG3 much more closely with those of Delftia phage φW-14, Bacillus subtilis phage SPO1, and Pseudomonas phage YuA, all known to produce and incorporate hydroxymethyluracil (hmdUra).
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Affiliation(s)
| | | | - Bob Blasdel
- The Evergreen State College, Olympia, WA, USA
- Department of Microbiology, The Ohio State University, Columbus, OH
| | - Ayman El-Shibiny
- The Evergreen State College, Olympia, WA, USA
- Faculty of Environmental Agricultural Sciences, Suez Canal University, Egypt
| | - Anna Castano
- The Evergreen State College, Olympia, WA, USA
- Department of Pediatric Neurology, University of Colorado Children's Hospital, Denver, CO
| | | | - Andrew M Kropinski
- Laboratory for Foodborne Zoonoses, Public Health Agency of Canada, Guelph, ON, Canada
- Department of Molecular & Cellular Biology, University of Guelph, ON, Canada
| | - Andre Villegas
- Laboratory for Foodborne Zoonoses, Public Health Agency of Canada, Guelph, ON, Canada
| | | | - Ana L Toribio
- The Wellcome Trust Sanger Institute, Genome Campus, Hinxton, England, UK
| | - Derek Pickard
- The Wellcome Trust Sanger Institute, Genome Campus, Hinxton, England, UK
| | - Hany Anany
- Canadian Research Institute for Food Safety, University of Guelph, ON, Canada
- Microbiology Department, Ain Shams University, Cairo, Egypt
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