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ATG16L1

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ATG16L1
Available structures
PDBOrtholog search: PDBe RCSB
Identifiers
AliasesATG16L1, autophagy related 16-like 1 (S. cerevisiae), APG16L, ATG16A, ATG16L, IBD10, WDR30, autophagy related 16 like 1
External IDsOMIM: 610767; MGI: 1924290; HomoloGene: 41786; GeneCards: ATG16L1; OMA:ATG16L1 - orthologs
Orthologs
SpeciesHumanMouse
Entrez

55054

77040

Ensembl

ENSG00000281089
ENSG00000085978

ENSMUSG00000026289

UniProt

Q676U5

Q8C0J2

RefSeq (mRNA)

NM_001205391
NM_001205392
NM_029846

RefSeq (protein)

NP_001192320
NP_001192321
NP_084122

Location (UCSC)Chr 2: 233.21 – 233.3 MbChr 1: 87.68 – 87.72 Mb
PubMed search[3][4]
Wikidata
View/Edit HumanView/Edit Mouse

Autophagy related 16 like 1 is a protein that in humans is encoded by the ATG16L1 gene.[5] This protein is characterized as a subunit of the autophagy-related ATG12-ATG5/ATG16 complex and is essentially important for the LC3 (ATG8) lipidation and autophagosome formation. This complex localizes to the membrane and is released just before or after autophagosome completion.[6]

Furthermore, ATG16L1 appears to have other autophagy-independent functions, e.g., intracellular membrane trafficking regulation and inflammation.[6] Autophagy in general plays a crucial role in pathways leading to innate and adaptive immunity activation.[7] That is why many autophagy-related proteins, including ATG16L1, their gene expression and its role in autoimmune diseases are studied in-depth nowadays.[when?]

Function

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Autophagy is the major intracellular degradation system delivering cytoplasmic components to lysosomes, and it accounts for degradation of most long-lived proteins and some organelles. Cytoplasmic constituents, including organelles, are sequestered into double-membraned autophagosomes, which subsequently fuse with lysosomes. ATG16L1 is a component of a large protein complex essential for autophagy.[8][9] Several proteins which interact with ATG16L have been identified to reveal its function. It appears that ATGL16L has an important role not only in autophagy but also in xenophagy for example during a bacterial infection, in antigen presentation in human B cells, plasma membrane repair in mouse embryonic fibroblasts, hormone secretion and in alcohol-induced sedation response in Drosophila.[10]

Structure

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ATG16L1 protein consists of three main domains - N-terminal region which contains an alpha-helix required for binding to ATG5 ubiquitin-folds, a middle region (coiled-coil domain, CCD), and a domain made of seven WD40 repeats, that forms a β-propeller, found in its C-terminal part. Polymorphisms and mutations in these domains are considered to be associated with several diseases.[11]

Due to present models, ATG16L1 is supposed to exist in ~800 kDa complexes which contain ATG12-ATG5 and several ATG16L1 dimers. These dimers are composed mostly of a CCD region of the protein and ATG5 binding site. The middle region is considered to be essential for the ATG16L1 function. Mice with CCD deletions exhibited phenotypic abnormalities as well as neonatal fatality, though non of these were observed in WD40 region deletion phenotype. Surprisingly, overexpression of CCD, as well as deletion, leads to an inhibition of autophagosome formation.[11]

Clinical significance

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ATG16L1 is expressed in the colon, intestinal cells, leukocytes and spleen. Recent studies have shown that mutations in the ATG16L1 gene may be linked to Crohn's disease.[12][13][14] A coding polymorphism in ATG16L1 gene is considered to be a risk factor for Crohn's disease development as well as ATG16L2. 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. It is also known that NOD2 interacts with ATG16L, ATG5 and ATG7 and provides antibacterial immune response through autophagy induction and MHC class II antigen-specific CD4+ T cell responses.[15] It has also been shown that low levels of ATG16L1 result in lower ATG16L1-NOD2 complex formation, which is crucial for bacterial autophagy in the bacterial entry site. Inhibition of autophagy leads to a NOD2 signaling through RIP2 kinase and induction of cytokine responses. This promotes an increase in mRNA expression of highly potent pro-inflammatory cytokines as interkleukin-1 (IL-1β).[7][16]

ATG16L1 also plays a role in viral infections. Through autophagy viral particles are delivered into the lysosome degradation pathway and interrogate with a specific type of pattern recognition receptor to initiate type I interferon (IFN-I) expression and viral clearance. Interestingly, ATG5-ATG12/ATG16L1 complex negatively regulates RIG-I-like receptor pathway and IFN-I expression. A mouse with a deletion in one of these genes appears to be resistant to virus replication. It is most likely due to an unregulated overexpression of IFN-I, which interferes with the virus life cycle.[6]

ATG16L2 is a related protein, which is also highly conserved (both ATG16L1 and 2 share 94 and 83% sequence identity). It has been shown that changes in ATG16L2 expression are correlated with Multiple Sclerosis (MS) and can be used as a serum biomarker of the disease and specifically for the prediction of relapse rates. Interestingly ATG16L2 mRNA expression was significantly reduced (~4-fold lower) in T cells isolated from the peripheral blood of MS patients in comparison to healthy age-matched controls, which may reflect their abnormal activation.[10]

References

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  1. ^ a b c ENSG00000085978 GRCh38: Ensembl release 89: ENSG00000281089, ENSG00000085978 – Ensembl, May 2017
  2. ^ a b c GRCm38: Ensembl release 89: ENSMUSG00000026289 – Ensembl, May 2017
  3. ^ "Human PubMed Reference:". National Center for Biotechnology Information, U.S. National Library of Medicine.
  4. ^ "Mouse PubMed Reference:". National Center for Biotechnology Information, U.S. National Library of Medicine.
  5. ^ Zheng H, Ji C, Li J, Jiang H, Ren M, Lu Q, et al. (August 2004). "Cloning and analysis of human Apg16L". DNA Sequence. 15 (4): 303–5. doi:10.1080/10425170400004104. PMID 15620219. S2CID 33446132.
  6. ^ a b c Hamaoui D, Subtil A (March 2021). "ATG16L1 functions in cell homeostasis beyond autophagy". The FEBS Journal. 289 (7): 1779–1800. doi:10.1111/febs.15833. PMID 33752267.
  7. ^ a b Zhou XJ, Zhang H (September 2012). "Autophagy in immunity: implications in etiology of autoimmune/autoinflammatory diseases". Autophagy. 8 (9): 1286–99. doi:10.4161/auto.21212. PMC 3442876. PMID 22878595.
  8. ^ Mizushima N, Kuma A, Kobayashi Y, Yamamoto A, Matsubae M, Takao T, et al. (May 2003). "Mouse Apg16L, a novel WD-repeat protein, targets to the autophagic isolation membrane with the Apg12-Apg5 conjugate". Journal of Cell Science. 116 (Pt 9): 1679–88. doi:10.1242/jcs.00381. PMID 12665549.
  9. ^ "Entrez Gene: ATG16L1 ATG16 autophagy related 16-like 1 (S. cerevisiae)".
  10. ^ a b c Xiong Q, Li W, Li P, Yang M, Wu C, Eichinger L (December 2018). "The Role of ATG16 in Autophagy and The Ubiquitin Proteasome System". Cells. 8 (1): 2. doi:10.3390/cells8010002. PMC 6356889. PMID 30577509.
  11. ^ a b Gammoh N (October 2020). "The multifaceted functions of ATG16L1 in autophagy and related processes". Journal of Cell Science. 133 (20). doi:10.1242/jcs.249227. hdl:20.500.11820/d006c089-cba6-422b-968c-cdfa90d77aad. PMID 33127840. S2CID 226218599.
  12. ^ Hampe J, Franke A, Rosenstiel P, Till A, Teuber M, Huse K, et al. (February 2007). "A genome-wide association scan of nonsynonymous SNPs identifies a susceptibility variant for Crohn disease in ATG16L1". Nature Genetics. 39 (2): 207–11. doi:10.1038/ng1954. PMID 17200669. S2CID 24615261.
  13. ^ Rioux JD, Xavier RJ, Taylor KD, Silverberg MS, Goyette P, Huett A, et al. (May 2007). "Genome-wide association study identifies new susceptibility loci for Crohn disease and implicates autophagy in disease pathogenesis". Nature Genetics. 39 (5): 596–604. doi:10.1038/ng2032. PMC 2757939. PMID 17435756.
  14. ^ Clayton DG, Cardon LR, Craddock N, Deloukas P, Duncanson A, Kwiatkowski DP, et al. (Wellcome Trust Case Control Consortium) (June 2007). "Genome-wide association study of 14,000 cases of seven common diseases and 3,000 shared controls". Nature. 447 (7145): 661–78. Bibcode:2007Natur.447..661B. doi:10.1038/nature05911. PMC 2719288. PMID 17554300.
  15. ^ Cui J, Chen Y, Wang HY, Wang RF (January 2015). "Mechanisms and pathways of innate immune activation and regulation in health and cancer". Human Vaccines & Immunotherapeutics. 10 (11): 3270–85. doi:10.4161/21645515.2014.979640. PMC 4514086. PMID 25625930.
  16. ^ Deretic V (April 2010). "Autophagy in infection". Current Opinion in Cell Biology. 22 (2): 252–62. doi:10.1016/j.ceb.2009.12.009. PMC 2866841. PMID 20116986.

Further reading

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This article incorporates text from the United States National Library of Medicine, which is in the public domain.

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