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Related Concept Videos

Autophagy01:27

Autophagy

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.
An autophagic pathway consists of a series of signaling events activated in response to diverse stress and physiological conditions such as food deprivation,...
Delivery Pathways to the Lysosome01:36

Delivery Pathways to the Lysosome

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.
Endocytosis
In endocytosis, the cell membrane takes up macromolecules and particles from the surrounding medium. Clathrin-mediated...
Molecular Chaperones and Protein Folding03:00

Molecular Chaperones and Protein Folding

The native conformation of a protein is formed by interactions between the side chains of its constituent amino acids. When the amino acids cannot form these interactions, the protein cannot fold by itself and needs chaperones. Notably, chaperones do not relay any additional information required for the folding of polypeptides; the native conformation of a protein is determined solely by its amino acid sequence. Chaperones catalyze protein folding without being a part of the folded protein.
The...
Molecular Chaperones and Protein Folding03:00

Molecular Chaperones and Protein Folding

The native conformation of a protein is formed by interactions between the side chains of its constituent amino acids. When the amino acids cannot form these interactions, the protein cannot fold by itself and needs chaperones. Notably, chaperones do not relay any additional information required for the folding of polypeptides; the native conformation of a protein is determined solely by its amino acid sequence. Chaperones catalyze protein folding without being a part of the folded protein.
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Autophagic Cell Death01:18

Autophagic Cell Death

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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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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Updated: Jul 5, 2026

Study of Protein-protein Interactions in Autophagy Research
14:08

Study of Protein-protein Interactions in Autophagy Research

Published on: September 9, 2017

Chaperone-mediated autophagy.

S Kaushik1, A M Cuervo

  • 1Department of Anatomy and Structural Biology, Marion Bessin Liver Research Center, Albert Einstein College of Medicine, New York, NY, USA.

Methods in Molecular Biology (Clifton, N.J.)
|April 22, 2008
PubMed
Summary
This summary is machine-generated.

Chaperone-mediated autophagy (CMA) degrades cytosolic proteins. CMA declines with aging and in diseases like Parkinson's, potentially causing protein buildup and cellular stress.

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Area of Science:

  • Cellular Biology
  • Molecular Biology
  • Autophagy Research

Background:

  • Chaperone-mediated autophagy (CMA) is a unique lysosomal degradation pathway for cytosolic proteins.
  • CMA activity is crucial for cellular homeostasis and is activated by various stressors.
  • Reduced CMA function is observed in aging and age-related diseases, such as Parkinson's disease.

Purpose of the Study:

  • To investigate the role and measurement of chaperone-mediated autophagy (CMA) in cellular health.
  • To understand the implications of decreased CMA activity in aging and neurodegenerative disorders.
  • To explore methods for stimulating CMA activity.

Main Methods:

  • Directly tracking substrate protein translocation into isolated lysosomes to measure CMA.
  • Analyzing changes in lysosomal components involved in substrate translocation.
  • Observing CMA activity under conditions of stress, aging, and disease models.

Main Results:

  • CMA selectively degrades cytosolic proteins, a process distinct from other autophagy types.
  • CMA activity diminishes with age and in conditions like Parkinson's disease.
  • Impaired CMA may lead to the accumulation of damaged proteins and increased cellular vulnerability.

Conclusions:

  • Reduced CMA contributes to cellular dysfunction in aging and age-related diseases.
  • Targeting lysosomal components could potentially enhance CMA activity.
  • Accurate measurement of CMA is essential for understanding its physiological and pathological roles.