{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,11,25]],"date-time":"2025-11-25T13:30:28Z","timestamp":1764077428164,"version":"build-2065373602"},"reference-count":36,"publisher":"MDPI AG","issue":"10","license":[{"start":{"date-parts":[[2023,9,28]],"date-time":"2023-09-28T00:00:00Z","timestamp":1695859200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"BfR","award":["45-003","45-009"],"award-info":[{"award-number":["45-003","45-009"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Viruses"],"abstract":"<jats:p>Telomere phages are a small group of temperate phages, whose prophages replicate as a linear plasmid with covalently closed ends. They have been isolated from some Enterobacteriaceae and from bacterial species living in aquatic environments. Phage PY54 was the first Yersinia (Y.) enterocolitica telomere phage isolated from a nonpathogenic O:5 strain, but recently a second telomeric Yersinia phage (vB_YenS_P840) was isolated from a tonsil of a wild boar in Germany. Both PY54 and vB_YenS_P840 (P840) have a siphoviridal morphology and a similar genome organization including the primary immunity region immB and telomere resolution site telRL. However, whereas PY54 only possesses one prophage repressor for the lysogenic cycle, vB_YenS_P840 encodes two. The telRL region of this phage was shown to be processed by the PY54 protelomerase under in vivo conditions, but unlike with PY54, a flanking inverted repeat was not required for processing. A further substantial difference between the phages is their host specificity. While PY54 infects Y. enterocolitica strains belonging to the serotypes O:5 and O:5,27, vB_YenS_P840 exclusively lyses O:3 strains. As the tail fiber and tail fiber assembly proteins of the phages differ significantly, we introduced the corresponding genes of vB_YenS_P840 by transposon mutagenesis into the PY54 genome and isolated several mutants that were able to infect both serotypes, O:5,27 and O:3.<\/jats:p>","DOI":"10.3390\/v15102019","type":"journal-article","created":{"date-parts":[[2023,9,29]],"date-time":"2023-09-29T02:47:30Z","timestamp":1695955650000},"page":"2019","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["The Novel Yersinia enterocolitica Telomere Phage vB_YenS_P840 Is Closely Related to PY54, but Reveals Some Striking Differences"],"prefix":"10.3390","volume":"15","author":[{"given":"Julia Anabell","family":"Br\u00e4uer","sequence":"first","affiliation":[{"name":"German Federal Institute for Risk Assessment, Department of Biological Safety, Max-Dohrn Str. 8\u201310, D-10589 Berlin, Germany"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6930-4358","authenticated-orcid":false,"given":"Jens Andre","family":"Hammerl","sequence":"additional","affiliation":[{"name":"German Federal Institute for Risk Assessment, Department of Biological Safety, Max-Dohrn Str. 8\u201310, D-10589 Berlin, Germany"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Sabrin","family":"El-Mustapha","sequence":"additional","affiliation":[{"name":"German Federal Institute for Risk Assessment, Department of Biological Safety, Max-Dohrn Str. 8\u201310, D-10589 Berlin, Germany"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Julius","family":"Fuhrmann","sequence":"additional","affiliation":[{"name":"German Federal Institute for Risk Assessment, Department of Biological Safety, Max-Dohrn Str. 8\u201310, D-10589 Berlin, Germany"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Andrea","family":"Barac","sequence":"additional","affiliation":[{"name":"German Federal Institute for Risk Assessment, Department of Biological Safety, Max-Dohrn Str. 8\u201310, D-10589 Berlin, Germany"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Stefan","family":"Hertwig","sequence":"additional","affiliation":[{"name":"German Federal Institute for Risk Assessment, Department of Biological Safety, Max-Dohrn Str. 8\u201310, D-10589 Berlin, Germany"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2023,9,28]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"895","DOI":"10.1046\/j.1365-2958.1999.01533.x","article-title":"The plasmid prophage N15: A linear DNA with covalently closed ends","volume":"33","author":"Rybchin","year":"1999","journal-title":"Mol. 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