Difference between revisions of "Myoviridae"

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{{Viral Biorealm Family}}
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[[Image:394-21.jpg|thumb|200px|right|Aeromonas virus 31, in the family Myoviridae. Courtesy of [mailto:ackermann@mcb.ulaval.ca Dr. Hans Ackermann]. From the [http://www.ncbi.nlm.nih.gov/ICTVdb/Images/Ackerman/Tailedph/Myovirid/394-21.htm ICTVdB - Picture Gallery].]]
 
[[Image:394-21.jpg|thumb|200px|right|Aeromonas virus 31, in the family Myoviridae. Courtesy of [mailto:ackermann@mcb.ulaval.ca Dr. Hans Ackermann]. From the [http://www.ncbi.nlm.nih.gov/ICTVdb/Images/Ackerman/Tailedph/Myovirid/394-21.htm ICTVdB - Picture Gallery].]]
  
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===Higher order taxa===
 
===Higher order taxa===
  
Virus; dsDNA viruses, no RNA stage; Caudovirales (order); Myoviridae
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Virus; dsDNA viruses, no RNA stage; Caudovirales; Myoviridae
  
 
===Genera===
 
===Genera===
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==Description and Significance==
 
==Description and Significance==
  
Myoviruses are a family of bacteriophages (from "bacteria" and the Greek ''phagein'', "to eat"), or viruses that infect bacteria. Myoviruses, along with several other bacteriophages, have a "head and tail" morphology that is not found in other groups of viruses. In myoviruses, the tail contracts; this is related to the virus' mode of penetration of the host cell. Bacteriophage T4, a myovirus, infects ''[[Escherichia|E. coli]]''.  (sources: [http://www.dform.com/projects/t4/virus.html An Introduction to the Bacteriophage T4 Virus] and [http://www-micro.msb.le.ac.uk/3035/Phages.html Microbiology @ Leicester])
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Myoviruses are a family of bacteriophages (from "bacteria" and the Greek ''phagein'', "to eat"), or viruses that infect bacteria. Myoviruses, along with several other bacteriophages, have a "head and tail" morphology that is not found in other groups of viruses. In myoviruses, the tail contracts; this is related to the virus' mode of penetration of the host cell. Bacteriophage T4, a myovirus, infects ''[[Escherichia|E. coli]]''.  (source: [http://www.dform.com/projects/t4/virus.html An Introduction to the Bacteriophage T4 Virus])
  
 
==Genome Structure==
 
==Genome Structure==
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[[Image:T4_Bacteriophage_1.gif|thumb|150px|right|Virion structure of a Bacteriphage T4.  From [http://www.resonancepub.com/microbiology.htm The Portal to Science, Engineering, and Technology]]]
 
[[Image:T4_Bacteriophage_1.gif|thumb|150px|right|Virion structure of a Bacteriphage T4.  From [http://www.resonancepub.com/microbiology.htm The Portal to Science, Engineering, and Technology]]]
  
Myoviruses are not enveloped and consist of a head and a tail, which are separated by a neck. The head has icosahedral symmetry, while the tail is tubular and has helical symmetry. The capsid that constitutes the head is made up of 152 capsomers. The head has a diameter of 50-110nm; the tail is 16-20nm in diameter. The tail consists of a central tube, a contractile sheath, a collar, a base plate, six tail pins and six long fibers. Tail structure is similar to tectiviridae, but differs in the fact that a myovirus' tail is permanent. Contractions of the tail require ATP. When the sheath is contracted, it measures 10-15nm in length.  (source: [http://www.ncbi.nlm.nih.gov/ICTVdb/ICTVdB/43000000.htm ICTVdB])
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Myoviruses are not enveloped and consist of a head and a tail separated by a neck. The head has icosahedral symmetry, while the tail is tubular and has helical symmetry. The capsid that constitutes the head is made up of 152 capsomers. The head has a diameter of 50-110nm; the tail is 16-20nm in diameter. The tail consists of a central tube, a contractile sheath, a collar, a base plate, six tail pins and six long fibers. Tail structure is similar to tectiviridae, but differs in the fact that a myovirus' tail is permanent. Contractions of the tail require ATP. When the sheath is contracted, it measures 10-15 nm in length.  (source: [http://www.ncbi.nlm.nih.gov/ICTVdb/ICTVdB/43000000.htm ICTVdB])
  
 
==Reproductive Cycle of a Myovirus in a Host Cell==
 
==Reproductive Cycle of a Myovirus in a Host Cell==
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==Viral Ecology & Pathology==
 
==Viral Ecology & Pathology==
  
Myoviruses, being bacteriophages, infect bacteria. The most commonly infected bacteria is ''[[Escherichia|Escherichia coli]]''. Myoviruses are virulent phages, meaning they do not integrate their genetic material with their host cell's, and they usually kill their host cell. It is difficult for myoviruses, like other phages, to create a successful infection. Because phages are so common, bacteria have developed specific mechanisms to fight off phage infections.  (sources: [http://www-micro.msb.le.ac.uk/3035/Phages.html Microbiology @ Leicester] and [http://biotype.biology.dal.ca/biol3101/virus.pdf Suttle])
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Myoviruses, being bacteriophages, infect bacteria. The most commonly infected bacteria is ''[[Escherichia|Escherichia coli]]''. Myoviruses are virulent phages, meaning they do not integrate their genetic material with their host cell's, and they usually kill their host cell.  (source: [http://biotype.biology.dal.ca/biol3101/virus.pdf Suttle])
  
==References. Updated June 5, 2006==
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==References==
  
 
[http://www.ncbi.nlm.nih.gov/ICTVdb/ICTVdB/43000000.htm ICTVdB - The Universal Virus Database, version 3. http://www.ncbi.nlm.nih.gov/ICTVdb/ICTVdB/]
 
[http://www.ncbi.nlm.nih.gov/ICTVdb/ICTVdB/43000000.htm ICTVdB - The Universal Virus Database, version 3. http://www.ncbi.nlm.nih.gov/ICTVdb/ICTVdB/]
  
 
[http://www.dform.com/projects/t4/virus.html An Introduction to the Bacteriophage T4 Virus]
 
[http://www.dform.com/projects/t4/virus.html An Introduction to the Bacteriophage T4 Virus]
 
[http://www-micro.msb.le.ac.uk/3035/Phages.html Microbiology @ Leicester: Virology: Bacteriophages]
 
  
 
[http://biotype.biology.dal.ca/biol3101/virus.pdf Suttle, Curtis A. "Viruses in the sea." ''Nature'' 437 (2005): 356-361.]
 
[http://biotype.biology.dal.ca/biol3101/virus.pdf Suttle, Curtis A. "Viruses in the sea." ''Nature'' 437 (2005): 356-361.]

Latest revision as of 00:29, 8 August 2010

This is a curated page. Report corrections to Microbewiki.

A Viral Biorealm page on the family Myoviridae

Aeromonas virus 31, in the family Myoviridae. Courtesy of Dr. Hans Ackermann. From the ICTVdB - Picture Gallery.

Baltimore Classification

Higher order taxa

Virus; dsDNA viruses, no RNA stage; Caudovirales; Myoviridae

Genera

T4-like viruses, P1-like viruses, P2-like viruses, μ-like viruses, SP01-like viruses, φH-like viruses, PBS1-like viruses

Description and Significance

Myoviruses are a family of bacteriophages (from "bacteria" and the Greek phagein, "to eat"), or viruses that infect bacteria. Myoviruses, along with several other bacteriophages, have a "head and tail" morphology that is not found in other groups of viruses. In myoviruses, the tail contracts; this is related to the virus' mode of penetration of the host cell. Bacteriophage T4, a myovirus, infects E. coli. (source: An Introduction to the Bacteriophage T4 Virus)

Genome Structure

The myovirus genome is non-segmented and contains a molecule of linear, double-stranded DNA. The complete genome is 33600-170000 nucleotides long, and has terminally redundant sequences. Guanine + cytosine content is 35%. (source: ICTVdB)

Virion Structure of a Myovirus

Virion structure of a Bacteriphage T4. From The Portal to Science, Engineering, and Technology

Myoviruses are not enveloped and consist of a head and a tail separated by a neck. The head has icosahedral symmetry, while the tail is tubular and has helical symmetry. The capsid that constitutes the head is made up of 152 capsomers. The head has a diameter of 50-110nm; the tail is 16-20nm in diameter. The tail consists of a central tube, a contractile sheath, a collar, a base plate, six tail pins and six long fibers. Tail structure is similar to tectiviridae, but differs in the fact that a myovirus' tail is permanent. Contractions of the tail require ATP. When the sheath is contracted, it measures 10-15 nm in length. (source: ICTVdB)

Reproductive Cycle of a Myovirus in a Host Cell

After a myovirus attaches to a host cell, it uses its contractile sheath to function like a syringe, piercing the cell wall with its central tube and injecting its genetic material into the host. The myovirus' genetic information takes over the host cell's mechanisms for transcription and translation and begins making new viruses. Once the cell has created as many myoviruses as it can, lysis occurs and the new viruses escape from the dead host cell. (source: An Introduction to the Bacteriophage T4 Virus)

Viral Ecology & Pathology

Myoviruses, being bacteriophages, infect bacteria. The most commonly infected bacteria is Escherichia coli. Myoviruses are virulent phages, meaning they do not integrate their genetic material with their host cell's, and they usually kill their host cell. (source: Suttle)

References

ICTVdB - The Universal Virus Database, version 3. http://www.ncbi.nlm.nih.gov/ICTVdb/ICTVdB/

An Introduction to the Bacteriophage T4 Virus

Suttle, Curtis A. "Viruses in the sea." Nature 437 (2005): 356-361.