Stress Response and Immunity: Links and Trade Offs

Stress Response and Immunity: Links and Trade Offs

When environmental conditions deviate from the optimal range, stress ensues. Stress response is a set of reactions that allow the organism to adjust and survive adverse conditions. Stress can be ...
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How Bacteria Cope With Stress

Pp. 71-100 (30)

Nadia Danilova

Abstract

Most of the information about stress response in prokaryotes comes from studies in bacteria. Bacteria developed a set of measures to maintain homeostasis in unstable environments. In response to a particular stress, bacteria switch their transcription to an alternative mode that better serves survival in the changed environment. They do it by using alternative sigma subunits of RNA polymerase (RNAP). Some sigma factors induce a transcription switch to a particular program that adjusts bacteria to specific stress, such as heat. Other sigma factors are responsible for the general stress response that protects the bacteria from various stresses. In addition to alternative transcriptional modes, bacteria use other mechanisms to cope with stress including DNA damage stress response and programmed cell death in response to severe stress.

Keywords:

Bacteria, Cold shock response, Envelope stress, General stress response, Heat shock response, (p)ppGpp, RNA thermometer, Stress, Sigma factor, Toxin-antitoxin.

Affiliation:

Department of Molecular Cell & Developmental Biology, University of California, Los Angeles CA, USA.