Shigella takes the temperature
نویسنده
چکیده
For bacteria, temperature is a fairly reliable cue for entry into a vertebrate host. Many pathogenic bacteria sense elevated temperatures (37°C) and turn on virulence and metabolic genes appropriate for survival and growth within the host. A recent study demonstrated that the expression of a heme uptake protein in Shigella dysenteriae and pathogenic Escherichia coli was dependent on an RNA thermometer.
منابع مشابه
Ecological Factors Influencing the Relationships between Klebsiella and Shigella in Mixed Culture.
Hentges, David J. (Loyola University, Chicago, Ill.), and MacDonald Fulton. Ecological factors influencing the relationships between Klebsiella and Shigella in mixed cultures. J. Bacteriol. 87:527-535. 1964.-Viable-cell counts of Shigella flexneri and Klebsiella (Aerobacter aerogenes) in pure and mixed culture were made during growth under predetermined conditions of temperature, pH, oxygen sup...
متن کاملModel for the combined effects of temperature, pH and sodium chloride concentration on survival of Shigella flexneri strain 5348 under aerobic conditions.
Shigella is recognized as a major foodborne pathogen; however, relatively few studies have been reported on its growth and survival characteristics, particularly under conditions relevant to food. A fractional factorial design was used to measure the effects and interactions of temperature (4-37 degrees C), pH (2-6) and NaCl (0.5-9%) on survival kinetics of Shigella flexneri strain 5348 in BHI ...
متن کاملStudies on lysogenesis. II. The effect of temperature on the lysogenization of Shigella dysenteriae with phage P1.
Sensitive bacteria, when infected with a temperate phage, either lyse or become lysogenic. With the temperate phage Pl and its host Shigella dysenteriae, the outcome of infection is affected strikingly by temperature. The discovery of this temperature effect has allowed us to study some features of the lysogenization process; these will be described in this paper. The definitions of certain ter...
متن کاملRegulator of Shigella Virulence
Virulence in Shigella spp., as well as in strains of enteroinvasive Escherichia col, is regulated by growth temperature. Previously, virR had been identified as the gene controlling the temperature-regulated expression of Shigella virulence. Since ShigeUa spp. and E. coli are also known to share >90% DNA sequence homology, we sought to determine if nonpathogenic E. coli K-12 C600 contains a gen...
متن کاملSurprising dependence on postsegregational killing of host cells for maintenance of the large virulence plasmid of Shigella flexneri.
Low-copy-number plasmids all encode multiple systems to ensure their propagation, including replication, partition (active segregation), and postsegregational killing (PSK) systems. PSK systems kill those rare cells that lose the plasmid due to replication or segregation errors. PSK systems should not be used as the principle means of maintaining the plasmid. The metabolic cost of killing the m...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره 4 شماره
صفحات -
تاریخ انتشار 2013