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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).
Within the lysosome/vacuole, the contents of the autophagosome are degraded via acidic lysosomal hydrolase. [44] Microautophagy, on the other hand, involves the direct engulfment of cytoplasmic material into the lysosome. [45] This occurs by invagination, meaning the inward folding of the lysosomal membrane, or cellular protrusion. [42]
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.
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.
The autophagosome also fuses with lysosomes to degrade its contents. When M. tuberculosis inhibit phagosome acidification, Interferon gamma can induce autophagy and rescue the maturation process. [ 30 ]
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 ().
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
Autophagy protein 5 (ATG5) is a protein that, in humans, is encoded by the ATG5 gene located on chromosome 6.It is an E3 ubi autophagic cell death.ATG5 is a key protein involved in the extension of the phagophoric membrane in autophagic vesicles.