Podoviridae

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Podoviridae
Podoviridae.svg
Typical structure of a podovirus
Virus classification
Group: Group I (dsDNA)
Order: Caudovirales
Family: Podoviridae
Sub-families

Podoviridae is a family of bacteriophages. This family is characterized by having very short, noncontractile tails.

Virology[edit]

The viron is nonenveloped with a head-tail structure. There are 9 structural proteins.

The head is ~60 nanometers (nm) in diameter, consists of 72 capsomers and is icosahedral with a T = 7 symmetry. The head protein has a molecular mass of ~38 kiloDaltons and is present in 460 copies per virion.

The tail is non-contractile and has 6 short subterminal fibers. It is thick and rod-shaped and built of stacked disks. The maximum length is ~17 nm.

The double stranded DNA genome is linear ~40–42 kilobases in length and encodes ~55 genes. The guanine + cytosine content is ~50%. It has terminally redundant sequences and is nonpermuted. By weight, the genome constitutes ~50% of the viron.

The genome encodes 9 structural proteins, an adenylated transferase B type DNA polymerase and an RNA polymerase. Three internal proteins constitute the polymerase complex.

Two classes of genes are recognized (early and late). This classification is based on the timing of transcription that is temporally regulated. Genes with related functions are clustered together. Genome replication is bidirectional.

In general, these viruses tend to be lytic rather than lysogenic.

Taxonomy[edit]

Genera within this family have ~40% homology between corresponding proteins. Subfamiles have ~20% homology between corresponding proteins.

This family is divided into two subfamiles (Autographivirinae and Picovirinae) and a number of genera awaiting classification into subfamilies.[1][2]

Other genera awaiting classification into subfamilies:

Proposed Genera[edit]

The following genera have been proposed but are not currently ratified by the International Committee on Taxonomy of Viruses:[2][3][4][5][6][7]

  • Genus 119xlikevirus; type species: Pseudomonas phage 119X
    • Species:
      • Pseudomonas phage 119X
  • Genus Cba40unalikevirus; type species: Cellulophaga phage phi40:1
    • Species:
      • Cellulophaga phage phi40:1
      • Cellulophaga phage phi38:1
  • Genus Cba183likevirus; type species: Cellulophaga phage phi18:3
    • Species:
      • Cellulophaga phage phi18:3
      • Cellulophaga phage phi13:2
      • Cellulophaga phage phi19:3
      • Cellulophaga phage phi46:3
  • Genus Cba142likevirus; type species: Cellulophaga phage phi14:2
    • Species:
      • Cellulophaga phage phi14:2
  • Genus Cba4unalikevirus; type species: Cellulophaga phage phi4:1
    • Species:
      • Cellulophaga phage phi4:1
      • Cellulophaga phage phi17:2
  • Genus Cpvunalikevirus; type species: Clostridium phage CpV1
    • Species:
      • Clostridium phage CpV1
  • Genus Gap227likevirus; type species: Cronobacter phage vB CsaP GAP227
    • Species:
      • Cronobacter phage vB CsaP GAP227
      • Yersinia phage phiR8-01
      • Yersinia phage phi80-18
      • Aeromonas phage phiAS7
  • Genus P60likevirus (synonyms = Marine Picocyanobacteria Podovirus subgroup or MPP subgroup); type species: Synechococcus phage P60
    • Species:
      • Synechococcus phage P60
  • Genus pelagiphages (informal); type species: Pelagibacter phage HTVC010P
    • Species:
      • Pelagibacter phage HTVC010P MAR122
      • Pelagibacter phage HTVC010P MAR123
      • Pelagibacter phage HTVC010P MAR124
  • Genus Vp2likevirus; type species: Vibrio phage VP2
    • Species:
      • Vibrio phage VP2
  • Genus Ys6unalikevirus; type species: Weissella phage phiYS61
    • Species:
      • Weissella phage phiYS61

References[edit]

  1. ^ "International Committee on Taxonomy of Viruses". ictvonline.org. Virology Division of IUMS. 2014. Retrieved August 14, 2014. 
  2. ^ a b Lavigne, R.; Seto, D.; Mahadevan, P.; Ackermann, H. W.; Kropinski, A. M. (2008). "Unifying classical and molecular taxonomic classification: analysis of the Podoviridae using BLASTP-based tools". Research in Microbiology 159 (5): 406–14. doi:10.1016/j.resmic.2008.03.005. PMID 18555669.  edit
  3. ^ Abbasifar R, Kropinski AM, Sabour PM, Ackermann HW, Alanis Villa A, Abbasifar A, Griffiths MW (2013) The genome of Cronobacter sakazakii bacteriophage vB_CsaP_GAP227 suggests a new genus within the Autographivirinae. Genome Announc 1(1). pii: e00122-12. doi:10.1128/genomeA.00122-12
  4. ^ Labrie SJ, Frois-Moniz K, Osburne MS, Kelly L, Roggensack SE, Sullivan MB, Gearin G, Zeng Q, Fitzgerald M, Henn MR, Chisholm SW (2012) Genomes of marine cyanopodoviruses reveal multiple origins of diversity. Environ Microbiol doi:10.1111/1462-2920.12053
  5. ^ Kleppen HP, Holo H, Jeon SR, Nes IF, Yoon SS (2012) A novel bacteriophage of the Podoviridae family infecting Weissella cibaria isolated from kimchi. Appl Environ Microbiol doi:10.1128/AEM.00031-12
  6. ^ Mizuno, C. M.; Rodriguez-Valera, F.; Kimes, N. E.; Ghai, R. (2013). "Expanding the Marine Virosphere Using Metagenomics". PLoS Genetics 9 (12): e1003987. doi:10.1371/journal.pgen.1003987. PMID 24348267.  edit
  7. ^ Holmfeldt, K.; Solonenko, N.; Shah, M.; Corrier, K.; Riemann, L.; Verberkmoes, N. C.; Sullivan, M. B. (2013). "Twelve previously unknown phage genera are ubiquitous in global oceans". Proceedings of the National Academy of Sciences 110 (31): 12798. doi:10.1073/pnas.1305956110.  edit

External Links[edit]