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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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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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After folding, the ER assesses the quality of secretory and membrane proteins. The correctly folded proteins are cleared by the calnexin cycle for transport to their final destination, while misfolded proteins are held back in the ER lumen. The ER chaperones attempt to unfold and refold the misfolded proteins but sometimes fail to achieve the correct native conformation. Such terminally misfolded proteins are then exported to the cytosol by ER-associated degradation or ERAD pathway for...
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Macroautophagy without LC3 conjugation?

Maurizio Renna1, David C Rubinsztein1

  • 1Department of Medical Genetics, University of Cambridge, Cambridge Institute for Medical Research, Wellcome Trust/MRC Building, Addenbrooke's Hospital, Hills Road, Cambridge, CB2 2XY, UK.

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|December 7, 2016
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Summary
This summary is machine-generated.

Autophagosomes, cellular recycling structures, can form without key proteins. These structures fuse with lysosomes but degrade slowly, revealing new roles for formation proteins in later stages of autophagy.

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Autophagy Research

Background:

  • Autophagy is a fundamental cellular process for degrading damaged components.
  • The core conjugation machinery is traditionally considered essential for autophagosome formation.
  • The precise roles of proteins in different stages of autophagy are still being elucidated.

Purpose of the Study:

  • To investigate autophagosome formation and degradation in the absence of core conjugation machinery.
  • To explore the functional implications of impaired autophagosome maturation.
  • To identify novel roles for autophagy-related proteins in later autophagic stages.

Main Methods:

  • Utilized genetic manipulation to disrupt core autophagy conjugation machinery.
  • Observed autophagosome formation using advanced microscopy techniques.
  • Assessed autophagosome-lysosome fusion and degradation kinetics.

Main Results:

  • Autophagosomes successfully formed despite the absence of essential conjugation proteins.
  • Autophagosomes exhibited fusion with lysosomes but showed significantly delayed degradation.
  • Delayed degradation correlated with the slower breakdown of the inner autophagosomal membrane.

Conclusions:

  • Core conjugation machinery is not strictly required for initial autophagosome biogenesis.
  • Proteins previously known for formation play critical roles in the late stages of autophagic degradation within autolysosomes.
  • This finding redefines the functional scope of key autophagy-related proteins.