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ATG5
Available structures PDB Ortholog search: PDBe RCSB List of PDB id codes 4GDK, 4GDL, 4NAW, 4TQ0, 4TQ1, 5D7G
Identifiers
Aliases	ATG5, APG5, APG5-LIKE, APG5L, ASP, hAPG5, autophagy related 5, SCAR25
External IDs	OMIM: 604261; MGI: 1277186; HomoloGene: 3566; GeneCards: ATG5; OMA:ATG5 - orthologs
Gene location (Human) Chr. Chromosome 6 (human) Band 6q21 Start 106,045,423 bp End 106,325,791 bp
Gene location (Mouse) Chr. Chromosome 10 (mouse) Band 10 B2|10 23.24 cM Start 44,144,354 bp End 44,240,287 bp
RNA expression pattern Bgee Human Mouse (ortholog) Top expressed in gonad mucosa of colon mucosa of sigmoid colon Achilles tendon jejunal mucosa endothelial cell oocyte rectum islet of Langerhans testicle Top expressed in primary oocyte secondary oocyte zygote facial motor nucleus lacrimal gland epithelium of stomach left lobe of liver Rostral migratory stream seminal vesicula transitional epithelium of urinary bladder More reference expression data BioGPS More reference expression data
Gene ontology Molecular function Atg8 ligase activity protein binding Cellular component cytoplasm phagophore assembly site membrane cytosol phagocytic vesicle membrane membrane Atg12-Atg5-Atg16 complex autophagosome axoneme mitochondria associated membranes Biological process immune system process negative regulation of cell death C-terminal protein lipidation autophagy of nucleus cellular response to nitrogen starvation apoptotic process autophagosome assembly autophagy of mitochondrion blood vessel remodeling cellular response to starvation response to fungus macroautophagy cellular homeostasis antigen processing and presentation of endogenous antigen negative regulation of protein ubiquitination aggrephagy negative stranded viral RNA replication vasodilation negative regulation of apoptotic process post-translational protein modification negative thymic T cell selection otolith development negative regulation of phagocytosis regulation of release of sequestered calcium ion into cytosol ventricular cardiac muscle cell development heart contraction protein lipidation involved in autophagosome assembly positive regulation of mucus secretion cellular response to nitrosative stress regulation of cilium assembly regulation of reactive oxygen species metabolic process negative regulation of reactive oxygen species metabolic process negative regulation of histone H4-K16 acetylation autophagy Sources:Amigo / QuickGO
Orthologs Species Human Mouse Entrez 9474 11793 Ensembl ENSG00000057663 ENSMUSG00000038160 UniProt Q9H1Y0 Q99J83 RefSeq (mRNA) NM_001286106 NM_001286107 NM_001286108 NM_001286111 NM_004849 NM_053069 NM_001314013 NM_001358596 RefSeq (protein) NP_001273035 NP_001273036 NP_001273037 NP_001273040 NP_004840 NP_001300942 NP_444299 NP_001345525 Location (UCSC) Chr 6: 106.05 – 106.33 Mb Chr 10: 44.14 – 44.24 Mb PubMed search
Wikidata
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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. It is activated by ATG7 and forms a complex with ATG12 and ATG16L1. This complex is necessary for LC3-I (microtubule-associated proteins 1A/1B light chain 3B) conjugation to PE (phosphatidylethanolamine) to form LC3-II (LC3-phosphatidylethanolamine conjugate). ATG5 can also act as a pro-apoptotic molecule targeted to the mitochondria. Under low levels of DNA damage, ATG5 can translocate to the nucleus and interact with survivin.

ATG5 is known to be regulated via various stress induced transcription factors and protein kinases.

Structure

ATG5 comprises three domains: a ubiquitin-like N-terminal domain (UblA), a helix-rich domain (HR) and a ubiquitin-like C-terminal domain (UblB). The three domains are connected by two linker regions (L1 and L2). ATG5 also has an alpha-helix at the N terminus where on Lysine 130 conjugation with ATG12 occurs. Both UblA and UbLB are composed of a five-stranded beta-sheet and two alpha-helices, a feature conserved in most ubiquitin and ubiquitin-like proteins. HR is composed of three long and one short alpha helices, forming a helix-bundle structure.

Regulation

ATG5 is regulated by the p73 from the p53 family of transcription factors. DNA damage induces the p300 acetylase to acetylate p73 with the assistance of c-ABL tyrosine kinase. p73 translocates to the nucleus and acts as a transcription factor for ATG5 as well as other apoptotic and autophagic genes.

Programmed Cell Death Protein 4 (PDCD4) is known to inhibit ATG5 expression via inhibition of protein translation. Two MA3 domains on PDCD4 bind to RNA-helicase EIF4A, preventing translation of ATG5 mRNA.

Many protein kinases can regulate activity of the ATG5 protein. Phosphorylation by various kinases are required in order to achieve its active conformation. Under cell stress conditions, the growth arrest and DNA damage 45 beta (Gadd45ß) protein will interact with MAPK/ERK kinase kinase 4 (MEKK4) to form the Gadd45ß-MEKK4 signaling complex. This complex then activates and selectively targets p38 MAPK to the autophagosome to phosphorylate ATG5 at threonine 75. This leads to the inactivation of ATG5 and inhibition of autophagy.

ATG5 can also be regulated post translationally by microRNA.

Function

Autophagy

The ATG12-ATG5:ATG16L complex is responsible for elongation of the phagophore in the autophagy pathway. ATG12 is first activated by ATG7, proceeded by the conjugation of ATG5 to the complex by ATG10 via a ubiquitination-like enzymatic process. The ATG12-ATG5 then forms a homo-oligomeric complex with ATG16L. With the help of ATG7 and ATG3, the ATG12-ATG5:ATG16L complex conjugates the C terminus of LC3-I to phosphatidylethanolamine in the phospholipid bilayer, allowing LC3 to associate with the membranes of the phagophore, becoming LC3-II. After formation of the autophagosome, the ATG12-ATG5:ATG16L complex dissociates from the autophagosome.

Apoptosis

In instances of spontaneous apoptosis or induction of apoptosis via staurosporine, HL-60, or EOL cells, ATG5 undergoes N-terminal cleavage by Calpain-1 and Calpain-2. The cleaved ATG5 translocates from the cytosol to the mitochondria, where it interacts with Bcl-xL, triggering the release of Cytochrome c and activating caspases leading to the apoptotic pathway. This function is independent of its role in autophagy, as it does not require interaction with ATG12.

Cell Cycle Arrest

In response to DNA damage, ATG5 expression is upregulated, increasing autophagy, preventing caspase activation and apoptosis. ATG5 is also responsible for G₂/M arrest and mitotic catastrophe by leading to the phosphorylation of CDK1 and CHEK2, two important regulators of cell cycle arrest. Furthermore, ATG5 is capable of translocating to the nucleus and interacting with survivin to disturb chromosome segregation by antagonistically competing with the ligand Aurora B.

Clinical Significance

As a key regulator of autophagy, any suppression of the ATG5 protein or loss-of-function mutations in the ATG5 gene will negatively affect autophagy. As a result, deficiencies in the ATG5 protein and variations in the gene have been associated with various inflammatory and degenerative diseases as aggregates of ubiquitinated targets are not cleared out via autophagy. Polymorphisms within the Atg5 gene have been associated with Behçet's disease, systemic lupus erythematosus, and lupus nephritis. Mutations in the gene promoter for the Atg5 gene have been associated with sporadic Parkinson's disease and childhood asthma. Downregulation of ATG5 protein and mutations in the Atg5 gene have also been linked with prostate, gastrointestinal and colorectal cancers as ATG5 plays a role in both cell apoptosis and cell cycle arrest. Upregulation of Atg5 on the other hand has been shown to suppress melanoma tumorigenesis through induction of cell senescence. ATG5 also plays a protective role in M. tuberculosis infections by preventing PMN-mediated immunopathology.

An Atg5 mutation in mice is known to be embryonic lethal. When the mutation is induced only in mice neurons or hepatocytes, there is an accumulation of ubiquitin-positive inclusion bodies and a decrease in cell function. Overexpression of ATG5 on the other hand has been linked to extend mouse lifespan. In the brain, ATG5 is responsible for astrocyte differentiation through activation of the JAK2-STAT3 pathway via degradation of SOCS2. Furthermore, reduction of ATG5 levels in mice brains leads to a suppression in differentiation and increase in cell proliferation of cortical neural progenitor cells through regulation of β-Catenin.

References

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12. Pyo JO, Jang MH, Kwon YK, Lee HJ, Jun JI, Woo HN, Cho DH, Choi B, Lee H, Kim JH, Mizushima N, Oshumi Y, Jung YK (May 2005). "Essential roles of Atg5 and FADD in autophagic cell death: dissection of autophagic cell death into vacuole formation and cell death". The Journal of Biological Chemistry. 280 (21): 20722–9. doi:10.1074/jbc.M413934200. PMID 15778222.
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15. Yousefi S, Perozzo R, Schmid I, Ziemiecki A, Schaffner T, Scapozza L, Brunner T, Simon HU (October 2006). "Calpain-mediated cleavage of Atg5 switches autophagy to apoptosis" (PDF). Nature Cell Biology. 8 (10): 1124–32. doi:10.1038/ncb1482. PMID 16998475. S2CID 17763282.
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External links

• Human ATG5 genome location and ATG5 gene details page in the UCSC Genome Browser.

Further reading

• Grand RJ, Milner AE, Mustoe T, Johnson GD, Owen D, Grant ML, Gregory CD (June 1995). "A novel protein expressed in mammalian cells undergoing apoptosis". Experimental Cell Research. 218 (2): 439–51. doi:10.1006/excr.1995.1177. PMID 7796880.
• Mizushima N, Sugita H, Yoshimori T, Ohsumi Y (December 1998). "A new protein conjugation system in human. The counterpart of the yeast Apg12p conjugation system essential for autophagy". The Journal of Biological Chemistry. 273 (51): 33889–92. doi:10.1074/jbc.273.51.33889. PMID 9852036.
• Schmeiser K, Armstrong S, Hammond EM, Grand RJ (2000). "Assignment of the yeast APG5 human homologue APG5L to chromosome band 6q21 by fluorescence in situ hybridisation". Cytogenetics and Cell Genetics. 87 (3–4): 213–4. doi:10.1159/000015471. PMID 10702672. S2CID 30950229.
• Pyo JO, Yoo SM, Ahn HH, Nah J, Hong SH, Kam TI, Jung S, Jung YK (2013). "Overexpression of Atg5 in mice activates autophagy and extends lifespan". Nature Communications. 4 (2300): 2300. Bibcode:2013NatCo...4.2300P. doi:10.1038/ncomms3300. PMC 3753544. PMID 23939249.
• Mizushima N, Yamamoto A, Hatano M, Kobayashi Y, Kabeya Y, Suzuki K, Tokuhisa T, Ohsumi Y, Yoshimori T (February 2001). "Dissection of autophagosome formation using Apg5-deficient mouse embryonic stem cells". The Journal of Cell Biology. 152 (4): 657–68. doi:10.1083/jcb.152.4.657. PMC 2195787. PMID 11266458.
• Chen Y, Peng XZ, Piao YJ (November 2001). "". Yi Chuan Xue Bao = Acta Genetica Sinica. 28 (11): 1077–84. PMID 11725643.
• Tanida I, Tanida-Miyake E, Komatsu M, Ueno T, Kominami E (April 2002). "Human Apg3p/Aut1p homologue is an authentic E2 enzyme for multiple substrates, GATE-16, GABARAP, and MAP-LC3, and facilitates the conjugation of hApg12p to hApg5p". The Journal of Biological Chemistry. 277 (16): 13739–44. doi:10.1074/jbc.M200385200. PMID 11825910.
• Tanida I, Nishitani T, Nemoto T, Ueno T, Kominami E (September 2002). "Mammalian Apg12p, but not the Apg12p.Apg5p conjugate, facilitates LC3 processing". Biochemical and Biophysical Research Communications. 296 (5): 1164–70. doi:10.1016/S0006-291X(02)02057-0. PMID 12207896.
• Yung HW, Xue L, Tolkovsky AM (November 2002). "Apoptosis-specific protein (ASP 45 kDa) is distinct from human Apg5, the homologue of the yeast autophagic gene apg5". FEBS Letters. 531 (2): 168–72. doi:10.1016/S0014-5793(02)03497-X. PMID 12417306. S2CID 21314619.
• Mizushima N, Yoshimori T, Ohsumi Y (December 2002). "Mouse Apg10 as an Apg12-conjugating enzyme: analysis by the conjugation-mediated yeast two-hybrid method". FEBS Letters. 532 (3): 450–4. doi:10.1016/S0014-5793(02)03739-0. PMID 12482611. S2CID 37247321.
• Mizushima N, Kuma A, Kobayashi Y, Yamamoto A, Matsubae M, Takao T, Natsume T, Ohsumi Y, Yoshimori T (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.
• Li Z, Hu CY, Mo BQ, Xu JD, Zhao Y (April 2003). "". AI Zheng = Aizheng = Chinese Journal of Cancer. 22 (4): 380–4. PMID 12703993.
• Simonsen A, Birkeland HC, Gillooly DJ, Mizushima N, Kuma A, Yoshimori T, Slagsvold T, Brech A, Stenmark H (August 2004). "Alfy, a novel FYVE-domain-containing protein associated with protein granules and autophagic membranes". Journal of Cell Science. 117 (Pt 18): 4239–51. doi:10.1242/jcs.01287. PMID 15292400.
• Suzuki Y, Yamashita R, Shirota M, Sakakibara Y, Chiba J, Mizushima-Sugano J, Nakai K, Sugano S (September 2004). "Sequence comparison of human and mouse genes reveals a homologous block structure in the promoter regions". Genome Research. 14 (9): 1711–8. doi:10.1101/gr.2435604. PMC 515316. PMID 15342556.

• Genes on human chromosome 6