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An autophagosome is a spherical structure with double layer membranes. [2] It is the key structure in macroautophagy , the intracellular degradation system for cytoplasmic contents (e.g., abnormal intracellular proteins , excess or damaged organelles , invading microorganisms).
First the phagophore engulfs the material that needs to be degraded, which forms a double membrane known as an autophagosome, around the organelle marked for destruction. [34] [42] The autophagosome then travels through the cytoplasm of the cell to a lysosome in mammals, or vacuoles in yeast and plants, [43] and the two organelles fuse. [34]
Phagocytosis of a bacterium, showing the formation of phagosome and phagolysosome. In cell biology, a phagosome is a vesicle formed around a particle engulfed by a phagocyte via phagocytosis.
Omegasomes act as progenitors of autophagosome formation during the autophagy pathway. [14] There are various autophagosome mediators involved in autophagy, however it is the omegasome regulation of the pathway that provides a smooth transition of autophagosome formation, and enrichment of nutrients in the cells.
MAP1LC3B is a member of the highly conserved ATG8 protein family. ATG8 proteins are present in all known eukaryotic organisms. The animal ATG8 family comprises three subfamilies: (i) microtubule-associated protein 1 light chain 3 (MAP1LC3); (ii) Golgi-associated ATPase enhancer of 16 kDa (GATE-16); and (iii) γ-amino-butyric acid receptor-associate protein ().
Chaperone-mediated autophagy (CMA) refers to the chaperone-dependent selection of soluble cytosolic proteins that are then targeted to lysosomes and directly translocated across the lysosome membrane for degradation.
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Autophagy-related protein 13 also known as ATG13 is a protein that in humans is encoded by the KIAA0652 gene. [5]ATG13 is an autophagy factor required for phagosome formation. . ATG13 is a target of the TOR kinase signaling pathway that regulates autophagy through phosphorylation of ATG13 and ULK1, and the regulation of the ATG13-ULK1-RB1CC1 comp