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Related Concept Videos

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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Bacterial growth is closely tied to nutrient availability, with cells proliferating exponentially under favorable conditions and entering a stationary phase when resources become scarce. This transition is mediated by a regulatory mechanism known as the stringent response, which allows bacteria to adapt to nutrient deprivation by modulating gene expression and metabolic activity.During nutrient scarcity, intracellular amino acid levels decline. It results in the accumulation of uncharged tRNAs...
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Inositol-requiring kinase one or IRE1 is the most conserved eukaryotic unfolded protein response (UPR) receptor. It is a type I transmembrane protein kinase receptor with a distinctive site-specific RNase activity. As the binding mechanics of the misfolded proteins with the N-terminal domain of IRE-1 are unclear, three binding models — direct, indirect, and allosteric -- are proposed for receptor activation. Nevertheless, it is known that once a misfolded protein associates with IRE1, it...
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The ER is the hub of protein synthesis in a cell. It has robust systems to quality control protein folding and also for degradation of terminally misfolded proteins. Under normal conditions, a small proportion of misfolded proteins that cannot be salvaged need to be transported to the cytoplasm by the ER-associated degradation or ERAD pathways. However, if the ERAD cannot handle the misfolded proteins, the cell activates the unfolded protein response or UPR to adjust the protein folding...
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Physiological Foundation of Stress01:24

Physiological Foundation of Stress

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Stress triggers a coordinated physiological response involving the sympathetic nervous system (SNS) and the hypothalamic-pituitary-adrenal (HPA) axis. This dual activation ensures that the body is prepared for both immediate and prolonged stress management. The process begins with the perception of a stressor. This initial phase activates the SNS, leading to the rapid release of adrenaline (epinephrine) from the adrenal glands.
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The stress response system, also known as the fight-or-flight response, is the body's automatic physiological reaction to perceived threats. Hans Selye introduced the concept of General Adaptation Syndrome (GAS) to describe the predictable pattern of changes that occur in response to stress. GAS consists of three sequential stages: alarm, resistance, and exhaustion. This model helps explain how chronic stress can contribute to health problems.
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Related Experiment Videos

eIF2B and the Integrated Stress Response: A Structural and Mechanistic View.

Assen Marintchev1, Takuhiro Ito2

  • 1Department of Physiology & Biophysics, Boston University School of Medicine, Boston, Massachusetts 02118, United States.

Biochemistry
|March 24, 2020
PubMed
Summary
This summary is machine-generated.

The guanine nucleotide exchange factor eIF2B is crucial for protein synthesis. New cryo-EM structures reveal conflicting models for its interaction with eIF2, impacting the integrated stress response (ISR) and neurodegenerative disease therapies.

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Area of Science:

  • Molecular Biology
  • Neuroscience
  • Structural Biology

Background:

  • The eukaryotic translation initiation factor 2 (eIF2) forms a ternary complex (TC) with GTP and Met-tRNAi, delivering it to the ribosome.
  • The guanine nucleotide exchange factor (GEF) eIF2B regenerates the TC.
  • Phosphorylation of eIF2 inhibits eIF2B, triggering the integrated stress response (ISR), which can lead to apoptosis or neuroprotection.

Purpose of the Study:

  • To review recent cryo-electron microscopy (cryo-EM) structures of eIF2B.
  • To discuss the functional and regulatory mechanisms of eIF2B.
  • To explore the therapeutic potential of ISR inhibitors for neurodegenerative disorders.

Main Methods:

  • Cryo-electron microscopy (cryo-EM) structural determination.
  • Biochemical assays.
  • Literature review of recent structural and preclinical data.

Main Results:

  • Multiple cryo-EM structures of the nonproductive eIF2B·eIF2(α-P) complex are consistent.
  • Significant discrepancies exist between published structures of the productive eIF2B·eIF2 complex.
  • Preclinical data support ISR inhibitors as neuroprotective agents.

Conclusions:

  • Conflicting structural data for eIF2B·eIF2 necessitate further investigation.
  • Understanding eIF2B structure and function is critical for developing therapies for neurodegenerative diseases.
  • eIF2B represents a promising therapeutic target for modulating the ISR.