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Escherichia virus T4 is a species of bacteriophages that infect Escherichia coli bacteria. It is a double-stranded DNA virus in the subfamily Tevenvirinae of the family Straboviridae . T4 is capable of undergoing only a lytic life cycle and not the lysogenic life cycle .
The virus attaches to the host cell using its terminal fibers, and uses viral exolysin to degrade the cell wall enough to eject the viral DNA into the host cytoplasm via contraction of its tail sheath. DNA-templated transcription is the method of transcription. The virus exits the host cell by lysis, and holin/endolysin/spanin proteins. Once ...
Enterobacteria phage T6 is a bacteriophage strain that infects Escherichia coli bacteria. It was one bacteriophage that was used as a model system in the 1950s in exploring the methods viruses replicate, along with the other T-even bacteriophages (which build up virus species Escherichia virus T4, a member of genus T4virus according to ICTV nomenclature): [1] Enterobacteria phage T2 ...
The T4 rII system is an experimental system developed in the 1950s by Seymour Benzer for studying the substructure of the gene. The experimental system is based on genetic crosses of different mutant strains of bacteriophage T4 , a virus that infects the bacteria Escherichia coli .
Escherichia virus T5, sometimes called Bacteriophage T5 is a caudal virus within the family Demerecviridae. This bacteriophage specifically infects E. coli bacterial cells and follows a lytic life cycle .
In a 1945 study by Demerec and Fano, [4] T7 was used to describe one of the seven phage types (T1 to T7) that grow lytically on Escherichia coli. [5] Although all seven phages were numbered arbitrarily, phages with odd numbers, or T-odd phages, were later discovered to share morphological and biochemical features that distinguish them from T-even phages. [6]
The virus attaches to the host cell adhesion receptors using its tail fibers, and ejects the viral DNA into the host periplasm via short tail system. Class I genes are transcribed by the host cell's RNA polymerase before the viral genome completely exits the capsid.
The virus's virion have icosahedral (T=9) [1] heads ~70 nm and short tails (10 nm), and contain short fibers originating from the junction between the head and tail. All the phages of this genus are strictly virulent and contain a linear dsDNA genome (with terminal repeats) in the range of 70-75kb.