8 nm provided with 4 short, kinked, terminal fibers. The flexible nature of the tail is best seen after phosphotungstate staining.
|
Type Species |
(T1) |
Tails are extremely flexible. Phage DNA has pac sites and is terminally redundant and circularly permuted.
Virions have icosahedral heads of about 60 nm and extremely flexible tails of 151 8 nm provided with 4 short, kinked, terminal fibers. The flexible nature of the tail is best seen after phosphotungstate staining.
Physicochemical and Physical Properties
Virion buoyant density in CsC1 is 1.5 g/cm3.
Genomes are about 49 kbp in size and have a G+C content of about 48%.
Virions contain at least 14 proteins including two major head proteins (Mr 26 and 33 103).
Not known.
Not known.
Genome Organization and Replication
The genetic map is linear and comprises 36-41 genes; related functions cluster together (Fig. 2). The genome is circularly permuted and terminally redundant (2.8 kbp or 6% of genome), and includes a recombinational hot spot. Host syntheses are inhibited after infection. The mechanism of Enterobacteria phage T1 replication is little known. Progeny DNA is cut from concatemers at pac sites and packaged by a headful mechanism.
Phages are virulent and general transductants, and infect enterobacteria.
List of Species Demarcation Criteria in the Genus
Not applicable.
Official virus species names are in italics. Tentative virus species names, alternative names ( ), strains or serotypes are not italicized. Virus names and assigned abbreviations ( ) are:
|
Enterobacteria phage T1 |
(T1) |
Tentative Species in the Genus
|
Enterobacteria phage 102 |
(102) |
|
Enterobacteria phage 103 |
(103) |
|
Enterobacteria phage 150 |
(150) |
|
Enterobacteria phage 168 |
(168) |
|
Enterobacteria phage 174 |
(174) |
|
Enterobacteria phage 4 |
(4) |
|
Enterobacteria phage D20 |
(D20) |
|
Enterobacteria phage |
() |
|
Enterobacteria phage Hi |
(Hi) |
|
Enterobacteria phage UC-1 |
(UC-1) |
About 50 more enterobacterial phages are considered as relatives of Enterobacteria phage T1 on morphological grounds.
|
|  |