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Regulation of the Unfolded Protein Response01:31

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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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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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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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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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Modification of secretory and transmembrane proteins entering the rough ER begins in the ER lumen. These modifications aid in protein folding and stabilize the acquired tertiary structure. Protein modifications in the rough ER co-occur at different stages of protein folding.
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Eukaryotic cells have a special pathway that enables communication between various intracellular membrane-bound compartments and also with the extracellular environment. This pathway is termed as the secretory pathway.
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The Endoplasmic Reticulum Stress Sensor Inositol-Requiring Enzyme 1α Augments Bacterial Killing through Sustained

Basel H Abuaita1, Kristin M Burkholder2, Blaise R Boles3

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Summary
This summary is machine-generated.

The unfolded protein response (UPR) sensor, inositol-requiring enzyme 1α (IRE1α), is crucial for killing methicillin-resistant Staphylococcus aureus (MRSA) by triggering sustained reactive oxygen species (ROS) production in macrophages, acting as a fail-safe mechanism against bacterial infection.

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Area of Science:

  • Immunology
  • Cellular Biology
  • Microbiology

Background:

  • Bacterial infections can activate cellular stress responses like the unfolded protein response (UPR).
  • The inositol-requiring enzyme 1α (IRE1α) pathway of the ER stress response is known for immune secretory functions but its role in innate immunity is less defined.

Purpose of the Study:

  • To investigate how endoplasmic reticulum (ER) stress, specifically the IRE1α pathway, contributes to the innate immune response against bacterial pathogens.
  • To elucidate the mechanisms by which IRE1α activation promotes bacterial killing by macrophages.

Main Methods:

  • Utilized methicillin-resistant Staphylococcus aureus (MRSA) as a model pathogen to infect human cells.
  • Investigated the activation of IRE1α and its role in bacterial killing in vitro and in vivo.
  • Assessed the requirement of reactive oxygen species (ROS) and the SNARE protein Sec22B in IRE1α-mediated antimicrobial activity.

Main Results:

  • MRSA infection activated IRE1α, which was essential for effective bacterial killing.
  • IRE1α-dependent killing required sustained generation of ROS, largely independent of Nox2.
  • Viable MRSA evaded early ROS, triggering robust IRE1α activation and subsequent ROS production.
  • The ER-resident SNARE Sec22B was necessary for concentrating ROS within phagosomes containing MRSA.

Conclusions:

  • IRE1α plays a critical role in macrophage bactericidal capacity against MRSA.
  • IRE1α-mediated persistent ROS generation acts as a fail-safe mechanism to eliminate bacterial pathogens that evade initial oxidative defenses.
  • Sec22B is crucial for the effective localization of antimicrobial ROS to phagosomes.