Introduction
Major types of autophagy
Based on the type of cargo delivery, there are three types of autophagy systems in mammals. They are macroautophagy (autophagy), microautophagy, and chaperone-mediated autophagy.
Macroautophagy (Autophagy): Whole regions of the cytosol are sequestered and delivered to lysosomes for degradation. Cargo sequestration occurs in the autophagosome, a double-membrane vesicle that forms through the elongation and sealing of a de novo generated membrane.
Microautophagy: Microautophagy is the direct uptake of soluble or particulate cellular constituents into lysosomes. It translocates cytoplasmic substances into the lysosomes for degradation via direct invagination, protrusion, or septation of the lysosomal limiting membrane.
Chaperone-Mediated Autophagy:Chaperone-mediated autophagy (CMA) has been characterized in higher eukaryotes but not in yeast. Because of the particular characteristics of this type of delivery, only soluble proteins, but not whole organelles, can be degraded through CMA.
Based on the type of cargo delivery, there are three types of autophagy systems in mammals. They are macroautophagy (autophagy), microautophagy, and chaperone-mediated autophagy.
Macroautophagy (Autophagy): Whole regions of the cytosol are sequestered and delivered to lysosomes for degradation. Cargo sequestration occurs in the autophagosome, a double-membrane vesicle that forms through the elongation and sealing of a de novo generated membrane.
Microautophagy: Microautophagy is the direct uptake of soluble or particulate cellular constituents into lysosomes. It translocates cytoplasmic substances into the lysosomes for degradation via direct invagination, protrusion, or septation of the lysosomal limiting membrane.
Chaperone-Mediated Autophagy:Chaperone-mediated autophagy (CMA) has been characterized in higher eukaryotes but not in yeast. Because of the particular characteristics of this type of delivery, only soluble proteins, but not whole organelles, can be degraded through CMA.
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