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Applied and environmental microbiology2021; 87(21); e0112421; doi: 10.1128/AEM.01124-21

Equine Intestinal O-Seroconverting Temperate Coliphage Hf4s: Genomic and Biological Characterization.

Abstract: Tailed bacteriophages constitute the bulk of the intestinal viromes of vertebrate animals. However, the relationships between lytic and lysogenic lifestyles of phages in these ecosystems are not always clear and may vary between the species or even between the individuals. The human intestinal (fecal) viromes are dominated mostly by temperate phages, while in horse feces virulent phages are more prevalent. To our knowledge, all the previously reported isolates of horse fecal coliphages are virulent. Temperate coliphage Hf4s was isolated from horse feces, from the indigenous equine Escherichia coli 4s strain. It is a podovirus related to the genus (including the well-characterized Salmonella bacteriophage P22). Hf4s recognizes the host O antigen as its primary receptor and possesses a functional O antigen seroconversion cluster that renders the lysogens protected from superinfection by the same bacteriophage and also abolishes the adsorption of some indigenous equine virulent coliphages, such as DT57C, while other phages, such as G7C or phiKT, retain the ability to infect E. coli 4s (Hf4s) lysogens. The relationships between virulent and temperate bacteriophages and their impact on high-density symbiotic microbial ecosystems of animals are not always clear and may vary between species or even between individuals. The horse intestinal virome is dominated by virulent phages, and Hf4s is the first temperate equine intestinal coliphage characterized. It recognizes the host O antigen as its primary receptor and possesses a functional O antigen seroconversion cluster that renders the lysogens protected from superinfection by some indigenous equine virulent coliphages, such as DT57C, while other phages, such as G7C or phiKT, retain the ability to infect E. coli 4s (Hf4s) lysogens. These findings raise questions on the significance of bacteriophage-bacteriophage interactions within the ecology of microbial viruses in mammal intestinal ecosystems.
Publication Date: 2021-08-18 PubMed ID: 34406832PubMed Central: PMC8516047DOI: 10.1128/AEM.01124-21Google Scholar: Lookup
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  • Journal Article
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Summary

This research summary has been generated with artificial intelligence and may contain errors and omissions. Refer to the original study to confirm details provided. Submit correction.

The research article discusses the genomic and biological characterizations of a temperate bacteriophage isolated from horse feces, known as Hf4s. This phage interacts with some specific types of other phages and has the capacity to alter the receptor of the host, thereby inhibiting certain infections.

Objective of the Research

  • The researchers aim to conduct a comprehensive genomic and biological characterization of an equine intestinal temperate coliphage, identified as Hf4s. This bacteriophage was derived from horse feces and pertains to Escherichia coli 4s strain.

Nature of Tailed Bacteriophages

  • Vertebrate animals are mostly occupied by tailed bacteriophages in their intestinal viromes; however, the relationship and functionality that exist between lytic and lysogenic bacteriophages within these systems remain somewhat unclear. This may vary widely between different species and even between individuals within the same species.

Virulent and Temperate Bacteriophages

  • Previously-reported isolates of horse fecal coliphages have always been virulent. The current study, however, identifies and focuses on the first temperate coliphage isolated from horse feces – Hf4s.
  • The study finds that the human intestinal viromes are generally dominated by temperate phages, while in the horse feces, virulent phages are more prevalent.

Detailed Characterization of Hf4s Phage

  • Hf4s is related to the Podovirus genus, represented by the well-known Salmonella bacteriophage P22. The primary receptor of Hf4s is the host O antigen.
  • Interestingly, Hf4s has an operational O antigen seroconversion cluster. This functionality allows lysogens, the bacterial cells carrying the phage DNA, to be shielded from superinfection by the same bacteriophage.

Implications for Microbial Ecology

  • The study sheds light on the potential bacteriophage-bacteriophage interactions within the microbial virus ecology in mammalian intestinal systems. More specifically, it recognizes and emphasizes the complex ecological roles played by bacteriophages in animal intestinal microbial ecosystems.
  • The Hf4s phage, as demonstrated in the research, can prevent adsorption by some native equine virulent coliphages, such as DT57C, while it does not affect the ability of some other phages, such as G7C or phiKT, to infect the E. coli 4s strain.

Cite This Article

APA
Kulikov EE, Golomidova AK, Efimov AD, Belalov IS, Letarova MA, Zdorovenko EL, Knirel YA, Dmitrenok AS, Letarov AV. (2021). Equine Intestinal O-Seroconverting Temperate Coliphage Hf4s: Genomic and Biological Characterization. Appl Environ Microbiol, 87(21), e0112421. https://doi.org/10.1128/AEM.01124-21

Publication

ISSN: 1098-5336
NlmUniqueID: 7605801
Country: United States
Language: English
Volume: 87
Issue: 21
Pages: e0112421
PII: e01124-21

Researcher Affiliations

Kulikov, Eugene E
  • Winogradsky Institute of Microbiology, Research Center of Biotechnology of Russian Academy of Sciencesgrid.4886.2, Moscow, Russia.
Golomidova, Alla K
  • Winogradsky Institute of Microbiology, Research Center of Biotechnology of Russian Academy of Sciencesgrid.4886.2, Moscow, Russia.
Efimov, Alexandr D
  • Winogradsky Institute of Microbiology, Research Center of Biotechnology of Russian Academy of Sciencesgrid.4886.2, Moscow, Russia.
Belalov, Ilya S
  • Winogradsky Institute of Microbiology, Research Center of Biotechnology of Russian Academy of Sciencesgrid.4886.2, Moscow, Russia.
Letarova, Maria A
  • Winogradsky Institute of Microbiology, Research Center of Biotechnology of Russian Academy of Sciencesgrid.4886.2, Moscow, Russia.
Zdorovenko, Evelina L
  • N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciencesgrid.4886.2, Moscow, Russia.
Knirel, Yuriy A
  • N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciencesgrid.4886.2, Moscow, Russia.
Dmitrenok, Andrei S
  • N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciencesgrid.4886.2, Moscow, Russia.
Letarov, Andrey V
  • Winogradsky Institute of Microbiology, Research Center of Biotechnology of Russian Academy of Sciencesgrid.4886.2, Moscow, Russia.

MeSH Terms

  • Animals
  • Coliphages / genetics
  • Escherichia coli / virology
  • Genomics
  • Horses / virology
  • O Antigens
  • Podoviridae / genetics
  • Superinfection

Grant Funding

  • State assignment / Ministry of Education and Science of the Russian Federation (Minobrnauka)
  • 18-29-13029 / Russian Foundation for Basic Research (u0420u0424u0424u0418)
  • 18-14-00098-P / Russian Science Foundation (RSF)

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Citations

This article has been cited 2 times.
  1. Letarov AV, Letarova MA. The Burden of Survivors: How Can Phage Infection Impact Non-Infected Bacteria?. Int J Mol Sci 2023 Feb 1;24(3).
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  2. Efimov AD, Golomidova AK, Kulikov EE, Belalov IS, Ivanov PA, Letarov AV. RB49-like Bacteriophages Recognize O Antigens as One of the Alternative Primary Receptors.. Int J Mol Sci 2022 Sep 26;23(19).
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