Related Experiment Video
Updated: Mar 20, 2026

07:20
Exploring the Regulation of Lipid Droplet Catabolism through Lipophagy
Published on: January 31, 2025
1.4K
The Incredible ULKs: Autophagy and Beyond
1National Laboratory of Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, Beijing 100101, P.R. China.
Molecular Cell
|May 21, 2016
Summary
Mammalian Atg1 homologs ULK1/2 are not essential for basal autophagy in neurons. These proteins regulate endoplasmic reticulum export independently of autophagy, revealing new functions for autophagy-related proteins.
Area of Science:
- Cell Biology
- Molecular Biology
- Neuroscience
Background:
- Autophagy is a fundamental cellular process regulated by Atg1 in yeast.
- The role of mammalian Atg1 homologs (ULK1/2) in neuronal autophagy is not fully understood.
Purpose of the Study:
- To investigate the necessity of ULK1/2 for basal autophagy in neurons.
- To explore autophagy-independent functions of ULK1/2.
Main Methods:
- Utilized knockout mouse models lacking ULK1/2 in neurons.
- Assessed basal autophagy levels using biochemical and imaging techniques.
- Investigated the interaction of ULK1/2 with SEC16A and ER export.
Main Results:
- ULK1 and ULK2 are dispensable for basal autophagy in mature neurons.
- ULK1/2 regulate the phosphorylation of SEC16A.
- ULK1/2 control endoplasmic reticulum export independently of autophagy.
Conclusions:
- Neuronal basal autophagy does not require ULK1/2.
- ULK1/2 possess significant autophagy-independent functions, including regulation of ER export.
- Autophagy proteins have broader roles in cellular regulation beyond autophagic pathways.
Related Concept Videos
Autophagy
6.0K
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,...
An autophagic pathway consists of a series of signaling events activated in response to diverse stress and physiological conditions such as food deprivation,...
6.0K
Delivery Pathways to the Lysosome
10.4K
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...
Endocytosis
In endocytosis, the cell membrane takes up macromolecules and particles from the surrounding medium. Clathrin-mediated...
10.4K
Autophagic Cell Death
4.9K
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.
Autophagy and Apoptosis
Autophagy can activate apoptosis. In normal conditions, the autophagy activating protein Beclin-1 and...
Autophagy and Apoptosis
Autophagy can activate apoptosis. In normal conditions, the autophagy activating protein Beclin-1 and...
4.9K
Phagocytosis
8.8K
Cells pull particles inward and engulf them in spherical vesicles in an energy-requiring process called endocytosis. Phagocytosis ("cellular eating") is one of three major types of endocytosis. Cells use phagocytosis to take in large objects, such as other cells (or their debris), bacteria, and even viruses.
The objective of phagocytosis is often destruction. Cells use phagocytosis to eliminate unwelcome visitors, like pathogens (e.g., viruses and bacteria). Many immune system cells,...
The objective of phagocytosis is often destruction. Cells use phagocytosis to eliminate unwelcome visitors, like pathogens (e.g., viruses and bacteria). Many immune system cells,...
8.8K
Phagocytosis
95.9K
Cells pull particles inward and engulf them in spherical vesicles in an energy-requiring process called endocytosis. Phagocytosis (“cellular eating”) is one of three major types of endocytosis. Cells use phagocytosis to take in large objects—such as other cells (or their debris), bacteria, and even viruses.
95.9K
Phagocytosis of Apoptotic Cells
5.5K
Cells undergoing apoptosis form apoptotic bodies that must be removed immediately to prevent inflammation, autoimmune diseases, and necrosis. Phagocytosis is carried out by professional phagocytes such as macrophages or immature dendritic cells. Non-professional phagocytes such as epithelial cells and fibroblasts also take part in this process; however, they are not as effective as professional phagocytes.
Normal cells contain receptors that prevent them from being recognized...
Normal cells contain receptors that prevent them from being recognized...
5.5K

