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1.
Arch Virol ; 168(2): 74, 2023 Jan 23.
Artículo en Inglés | MEDLINE | ID: mdl-36683075

RESUMEN

This article summarises the activities of the Bacterial Viruses Subcommittee of the International Committee on Taxonomy of Viruses for the period of March 2021-March 2022. We provide an overview of the new taxa proposed in 2021, approved by the Executive Committee, and ratified by vote in 2022. Significant changes to the taxonomy of bacterial viruses were introduced: the paraphyletic morphological families Podoviridae, Siphoviridae, and Myoviridae as well as the order Caudovirales were abolished, and a binomial system of nomenclature for species was established. In addition, one order, 22 families, 30 subfamilies, 321 genera, and 862 species were newly created, promoted, or moved.


Asunto(s)
Bacteriófagos , Caudovirales , Siphoviridae , Virus , Humanos , Virus/genética , Myoviridae
2.
Arch Virol ; 166(11): 3239-3244, 2021 Nov.
Artículo en Inglés | MEDLINE | ID: mdl-34417873

RESUMEN

In this article, we - the Bacterial Viruses Subcommittee and the Archaeal Viruses Subcommittee of the International Committee on Taxonomy of Viruses (ICTV) - summarise the results of our activities for the period March 2020 - March 2021. We report the division of the former Bacterial and Archaeal Viruses Subcommittee in two separate Subcommittees, welcome new members, a new Subcommittee Chair and Vice Chair, and give an overview of the new taxa that were proposed in 2020, approved by the Executive Committee and ratified by vote in 2021. In particular, a new realm, three orders, 15 families, 31 subfamilies, 734 genera and 1845 species were newly created or redefined (moved/promoted).


Asunto(s)
Virus de Archaea/clasificación , Bacteriófagos/clasificación , Sociedades Científicas/organización & administración , Archaea/virología , Bacterias/virología
3.
4.
J Basic Microbiol ; 59(7): 754-764, 2019 Jul.
Artículo en Inglés | MEDLINE | ID: mdl-31099101

RESUMEN

To date, a small number of temperate phages are known to infect members of the genus Erwinia. In this study, the genomes of temperate phages vB_EhrS_49 and vB_EhrS_59 infecting Erwinia horticola, the causative agent of beech black bacteriosis in Ukraine, were sequenced and annotated. Their genomes reveal no significant similarity to that of any previously reported viruses of Enterobacteriaceae. At the same time, phages 49 and 59 share extensive nucleotide sequence identity across the regions encoding head assembly, DNA packaging, and lysis. Despite significant homology between structural modules, the organization of distal tail morphogenesis genes is different. Furthermore, a number of putative morons and DNA methylases have been found in both phage genomes. Due to the revealed synteny as well as the structure of lysogeny module, phages 49 and 59 are suggested to be novel members of the lambdoid phage group. Conservative structural genes together with varying homology across the nonstructural region of the genomes make phages 49 and 59 highly promising objects for studying the genetic recombination and evolution of microbial viruses. The obtained data may as well be helpful for better understanding of relationships among Erwinia species.


Asunto(s)
Bacteriófagos/genética , Erwinia/virología , Genoma Bacteriano/genética , Genoma Viral/genética , Siphoviridae/genética , ADN Viral/genética , Genes Virales , Lisogenia , Filogenia , Enfermedades de las Plantas/microbiología , Análisis de Secuencia de ADN , Siphoviridae/clasificación , Especificidad de la Especie , Sintenía
5.
Virus Res ; 329: 199088, 2023 05.
Artículo en Inglés | MEDLINE | ID: mdl-36907559

RESUMEN

In this study, the genome of the lytic broad-host-range phage Key infecting Erwinia amylovora, Erwinia horticola, and Pantoea agglomerans strains was characterized. Key phage has a 115,651 bp long double-stranded DNA genome with the G + C ratio of 39.03%, encoding 182 proteins and 27 tRNA genes. The majority (69%) of predicted coding sequences (CDSs) encode proteins with unknown functions. The protein products of 57 annotated genes were found to have probable functions in nucleotide metabolism, DNA replication, recombination, repair, and packaging, virion morphogenesis, phage-host interaction and lysis. Furthermore, the product of gene 141 shared amino acid sequence similarity and conserved domain architecture with the exopolysaccharide (EPS) degrading proteins of Erwinia and Pantoea infecting phages as well as bacterial EPS biosynthesis proteins. Due to the genome synteny and similarity to the proteins of T5-related phages, phage Key, together with its closest relative, Pantoea phage AAS21, was suggested to represent a novel genus within the Demerecviridae family, for which we tentatively propose the name "Keyvirus".


Asunto(s)
Bacteriófagos , Erwinia amylovora , Bacteriófagos/genética , Erwinia amylovora/genética , Especificidad del Huésped , Virión/genética , Genoma Viral
6.
Genome Announc ; 1(6)2013 Dec 12.
Artículo en Inglés | MEDLINE | ID: mdl-24336362

RESUMEN

RB43-related bacteriophages have a specific genome type that clearly distinguishes them from other T4-like viruses. Here, we present the complete genome sequence of a new virulent phage, Lw1, isolated as an Escherichia coli BL21(DE3) contaminant. Lw1 shares an RB43-like genome organization, but it does not contain putative AP2-domain endonuclease genes.

7.
PLoS One ; 7(7): e40102, 2012.
Artículo en Inglés | MEDLINE | ID: mdl-22792219

RESUMEN

Among dsDNA tailed bacteriophages (Caudovirales), members of the Myoviridae family have the most sophisticated virion design that includes a complex contractile tail structure. The Myoviridae generally have larger genomes than the other phage families. Relatively few "dwarf" myoviruses, those with a genome size of less than 50 kb such as those of the Mu group, have been analyzed in extenso. Here we report on the genome sequencing and morphological characterization of a new group of such phages that infect a diverse range of Proteobacteria, namely Aeromonas salmonicida phage 56, Vibrio cholerae phages 138 and CP-T1, Bdellovibrio phage φ1422, and Pectobacterium carotovorum phage ZF40. This group of dwarf myoviruses shares an identical virion morphology, characterized by usually short contractile tails, and have genome sizes of approximately 45 kb. Although their genome sequences are variable in their lysogeny, replication, and host adaption modules, presumably reflecting differing lifestyles and hosts, their structural and morphogenesis modules have been evolutionarily constrained by their virion morphology. Comparative genomic analysis reveals that these phages, along with related prophage genomes, form a new coherent group within the Myoviridae. The results presented in this communication support the hypothesis that the diversity of phages may be more structured than generally believed and that the innumerable phages in the biosphere all belong to discrete lineages or families.


Asunto(s)
Bacteriófagos/genética , Bacteriófagos/ultraestructura , Bacteriófagos/fisiología , Orden Génico , Genoma Viral , Datos de Secuencia Molecular , Myoviridae/genética , Myoviridae/fisiología , Myoviridae/ultraestructura , Filogenia
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