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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).
Atg16L1 is a member of an E3-like protein complex involved in one of two ubiquitin-like conjugation systems essential for autophagosome formation. The FIP200 cis-Golgi-derived membranes fuse with ATG16L1-positive endosomal membranes to form the prophagophore termed HyPAS (hybrid pre-autophagosomal structure). [66]
DNA is a long polymer made from repeating units called nucleotides. [6] [7] The structure of DNA is dynamic along its length, being capable of coiling into tight loops and other shapes. [8] In all species it is composed of two helical chains, bound to each other by hydrogen bonds.
ATG16L1 appears to be an essential protein for the function of intestinal stem cells, morphological structure of intestinal cells and granule exocytosis pathway of the Paneth cells in animal models. [10] Bacteria invasion leads to ATG16L1 recruiting by NOD1 and NOD2. This results in autophagy in RIP2/NF-κB independent manner.
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 ().
After finishing vesicle expansion, the autophagosome is ready for fusion with the lysosome and Atg8 can either be released from the membrane for recycling (see below) or gets degraded in the autolysosome if left uncleaved. ATG8 is also required for a different autophagy-related process called the cytoplasm-to-vacuole targeting (Cvt) pathway. [14]
AuTophaGy related 1 (Atg1) is a 101.7kDa serine/threonine kinase in S.cerevisiae, encoded by the gene ATG1. [1] It is essential for the initial building of the autophagosome and Cvt vesicles.