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Related Concept Videos

Autophagy01:27

Autophagy

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Autophagy is a self-digesting process by which a cell protects itself from threats both within and outside the cell, ranging from abnormal proteins to invading bacteria. In this process, obsolete components of the cell and invading microbes are degraded by hydrolytic enzymes active in an acidic environment of the lysosomal lumen.
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Delivery Pathways to the Lysosome01:36

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Eukaryotic cells use different mechanisms to eliminate toxic waste obsolete and worn-out substances. Lysosomes play a pivotal role in this, and hence, these substances are carried to the lysosome from other parts of the cell and extracellular space through different pathways. The most elaborately studied pathways to the lysosome are the endocytic pathways.
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Christian de Duve discovered “autophagy,” a process in which cellular components are engulfed by membrane-bound organelles called autophagosomes. The autophagosomes then fuse with lysosomes to digest the enclosed contents. Autophagy is generally activated in cells to prevent cell death. However, cell death is triggered when the damage is beyond repair.
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Cellular Injury V: Apoptosis and Autophagy01:22

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Cells respond to damage and stress through highly coordinated processes that decide whether they survive or undergo controlled self-destruction. Two major pathways involved in this regulation are apoptosis, a type of programmed cell death, and autophagy, a survival mechanism that helps cells adapt to adverse conditions.ApoptosisApoptosis removes aged or injured cells to maintain tissue balance. During this process, the cell shrinks, chromatin condenses and fragments, and membrane-bound...
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Bacterial Protein Maturation01:26

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Bacterial protein maturation is a tightly regulated process that ensures newly synthesized polypeptides achieve correct functional conformations. This maturation involves a series of modifications, folding events, and quality control steps, often assisted by specialized chaperone proteins.N-Terminal ModificationsThe maturation of bacterial polypeptides begins cotranslationally as the polypeptide exits the ribosome. The first amino acid, N-formylmethionine (fMet), is typically modified at the...
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Cytoskeletal Proteins in Bacteria01:29

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Bacterial cells were initially considered simple, randomly organized structures lacking a cytoskeleton. However, the discovery of cytoskeleton homologs in bacteria led to the change of this opinion. Bacterial cytoskeletal filaments regulate the cell shape, cell polarity, cell division, and partitioning of plasmids during cell division. It was later discovered that bacterial cytoskeletal proteins, mainly actin and tubulin homologs, are diverse compared to their eukaryotic counterparts. On the...
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Related Experiment Video

Updated: Apr 19, 2026

Assessing Autophagic Flux by Measuring LC3, p62, and LAMP1 Co-localization Using Multispectral Imaging Flow Cytometry
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Emerging themes in bacterial autophagy.

Matthew T Sorbara1, Stephen E Girardin2

  • 1Department of Immunology, University of Toronto, Toronto M5S 1A8, Canada.

Current Opinion in Microbiology
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Xenophagy, a type of autophagy, eliminates intracellular bacteria. Recent advances reveal key targeting mechanisms, metabolic sensor roles in induction, and bacterial evasion strategies, highlighting xenophagy's broad role in controlling bacterial growth.

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Area of Science:

  • Cellular Biology
  • Immunology
  • Microbiology

Background:

  • Autophagy plays a crucial role in cellular defense.
  • Xenophagy specifically targets intracellular bacterial pathogens for degradation.

Purpose of the Study:

  • To review recent advances in the field of xenophagy.
  • To discuss the mechanisms involved in bacterial targeting and xenophagy induction.
  • To present bacterial strategies for escaping xenophagy.

Main Methods:

  • Literature review of recent studies on xenophagy.
  • Analysis of molecular mechanisms of bacterial recognition and degradation.
  • Examination of metabolic regulation of xenophagy.
  • Review of in vitro and in vivo evidence.

Main Results:

  • Bacterial targeting involves ubiquitination, diacylglycerol (DAG), and proteins like Nod1, Nod2, NDP52, p62, NBR1, optineurin, LRSAM1, and parkin.
  • Metabolic sensors including mTOR and AMPK are critical for inducing xenophagy.
  • Evidence supports a global role for xenophagy in controlling bacterial growth.
  • Bacteria have evolved diverse mechanisms to evade xenophagy.

Conclusions:

  • Xenophagy is a vital cellular process for combating intracellular bacterial infections.
  • Understanding xenophagy mechanisms and bacterial evasion strategies is crucial for developing new therapeutic approaches.