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Other Stress Responses in Bacteria01:30

Other Stress Responses in Bacteria

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Bacteria have global regulatory systems that control several types of stress mechanisms. These include Pho regulon and the heat shock response, which are essential systems for environmental adaptation, such as nutrient limitation and proteotoxic stress. The Pho regulon and the heat shock response exemplify bacterial resilience, enabling rapid adaptation to fluctuating environmental conditions.Pho RegulonBacteria require phosphorus for essential cellular processes, including nucleic acid...
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Signaling cascades usually lack linearity. Multiple pathways interact and regulate one another, allowing cells to integrate and respond to diverse environmental stimuli.
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In response to DNA damage, cells can pause the cell cycle to assess and repair the breaks. However, the cell must check the DNA at certain critical stages during the cell cycle. If the cell cycle pauses before DNA replication, the cells will contain twice the amount of DNA. On the other hand, if cells arrest after DNA replication but before mitosis, they will contain four times the normal amount of DNA. With a host of specialized proteins at their disposal,cells must use the right protein at...
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Measurements of Physiological Stress Responses in C. Elegans
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Distributing tasks via multiple input pathways increases cellular survival in stress.

Alejandro A Granados1,2, Matthew M Crane1,3, Luis F Montano-Gutierrez1,3

  • 1SynthSys - Synthetic and Systems Biology, University of Edinburgh, Edinburgh, United Kingdom.

Elife
|May 18, 2017
PubMed
Summary
This summary is machine-generated.

Single cells balance competing demands using separate signaling pathways for speed and accuracy. This division of labor enhances cellular survival under dynamic osmotic stress conditions.

Keywords:
MAP kinaseS. cerevisiaecellular perceptioncomputational biologymicrofluidicssignal transductionspeed-accuracy trade-offstress responsesystems biology

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Area of Science:

  • Cellular biology
  • Systems biology
  • Biochemistry

Background:

  • Cellular signaling networks face trade-offs between response speed and accuracy.
  • Understanding how these opposing demands impact single-cell fitness in dynamic environments is crucial.

Purpose of the Study:

  • To investigate how budding yeast (Saccharomyces cerevisiae) manages conflicting performance demands in signaling pathways under hyperosmotic stress.
  • To determine the impact of distinct signaling pathway assignments on cellular fitness in fluctuating stress conditions.

Main Methods:

  • Studied budding yeast responses to dynamic hyperosmotic stress.
  • Analyzed the roles of separate input pathways converging on the Hog1 (a p38 MAP kinase) signaling node.
  • Compared fitness of cells with different pathway configurations under various stress scenarios.

Main Results:

  • A fast, less accurate 'reflex-like' pathway enhances fitness in sudden stress.
  • A slow, more accurate pathway improves fitness in gradually increasing or fluctuating stress.
  • The signaling network mitigates performance trade-offs by dividing tasks between subnetworks.

Conclusions:

  • Cellular signaling networks can overcome performance trade-offs through a division of labor.
  • Assigning opposing tasks to distinct subnetworks optimizes cellular survival in dynamic environments.
  • This strategy of task partitioning may be a general principle in cellular signal transduction.