MAP1LC3A

Microtubule-associated proteins 1A/1B light chain 3A is a protein that in humans is encoded by the MAP1LC3A gene.[5][6][7] Two transcript variants encoding different isoforms have been found for this gene.

MAP1LC3A
Available structures PDB Ortholog search: PDBe RCSB List of PDB id codes 3ECI, 3WAL, 3WAN, 4ZDV
Identifiers
Aliases	MAP1LC3A, ATG8E, LC3, LC3A, MAP1ALC3, MAP1BLC3, microtubule associated protein 1 light chain 3 alpha
External IDs	OMIM: 601242 MGI: 1915661 HomoloGene: 12021 GeneCards: MAP1LC3A
Gene location (Human) Chr. Chromosome 20 (human)[1] Band 20q11.22 Start 34,546,854 bp[1] End 34,560,345 bp[1]
Gene location (Mouse) Chr. Chromosome 2 (mouse)[2] Band 2|2 H1 Start 155,276,297 bp[2] End 155,278,073 bp[2]
Gene ontology Molecular function • phosphatidylethanolamine binding • GO:0001948 protein binding • phospholipid binding • ubiquitin protein ligase binding • microtubule binding Cellular component • cytoplasm • organelle membrane • cytosol • late endosome • membrane • autophagosome • microtubule • cytoskeleton • cytoplasmic vesicle • endomembrane system • autolysosome • autophagosome membrane • synapse Biological process • autophagy • autophagy of mitochondrion • autophagosome assembly • response to iron(II) ion • response to lead ion • response to nutrient levels • cellular response to amino acid starvation • response to morphine • cellular response to hydrogen peroxide • cellular response to copper ion • cellular response to nitrogen starvation • cellular response to starvation • macroautophagy • GO:0000046 autophagosome maturation Sources:Amigo / QuickGO
Orthologs
Species	Human	Mouse
Entrez	84557	66734
Ensembl	ENSG00000101460	ENSMUSG00000027602
UniProt	Q9H492	Q91VR7
RefSeq (mRNA)	NM_032514 NM_181509	NM_025735
RefSeq (protein)	NP_115903 NP_852610	NP_080011
Location (UCSC)	Chr 20: 34.55 – 34.56 Mb	Chr 2: 155.28 – 155.28 Mb
PubMed search	[3]	[4]
Wikidata
View/Edit Human View/Edit Mouse

Function

MAP1A and MAP1B are microtubule-associated proteins which mediate the physical interactions between microtubules and components of the cytoskeleton. MAP1A and MAP1B each consist of a heavy chain subunit and multiple light chain subunits. The protein encoded by this gene is one of the light chain subunits and can associate with either MAP1A or MAP1B.[7]

MAPLC3A is one of the mammalian homologues of yeast ATG8, an important marker and effector of autophagy.[8]

Regulation

MAP1LC3A is regulated by several post-translational modifications. These include covalent linkage of the C-terminus to phosphatidylethanolamine in autophagic membranes, and phosphorylation by protein kinase A,[9] which downregulates its autophagy functions. Noncovalent interactions are important for its cargo targeting functions in selective autophagy. For example, it has been shown to interact with sequestosome 1.[10]

References

1. GRCh38: Ensembl release 89: ENSG00000101460 - Ensembl, May 2017
2. GRCm38: Ensembl release 89: ENSMUSG00000027602 - 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. Mann SS, Hammarback JA (May 1997). "Gene localization and developmental expression of light chain 3: a common subunit of microtubule-associated protein 1A(MAP1A) and MAP1B". J Neurosci Res. 43 (5): 535–44. doi:10.1002/(SICI)1097-4547(19960301)43:5<535::AID-JNR3>3.0.CO;2-J. PMID 8833088.
6. Pankiv S, Clausen TH, Lamark T, Brech A, Bruun JA, Outzen H, Overvatn A, Bjorkoy G, Johansen T (Aug 2007). "p62/SQSTM1 binds directly to Atg8/LC3 to facilitate degradation of ubiquitinated protein aggregates by autophagy". J Biol Chem. 282 (33): 24131–45. doi:10.1074/jbc.M702824200. PMID 17580304.
7. "Entrez Gene: MAP1LC3A microtubule-associated protein 1 light chain 3 alpha".
8. Valente G, Morani F, Nicotra G, Fusco N, Peracchio C, Titone R, Alabiso O, Arisio R, Katsaros D, Benedetto C, Isidoro C (2014). "Expression and clinical significance of the autophagy proteins BECLIN 1 and LC3 in ovarian cancer". Biomed Res Int. 2014: 462658. doi:10.1155/2014/462658. PMC 4127242. PMID 25136588.
9. Cherra SJ, Kulich SM, Uechi G, Balasubramani M, Mountzouris J, Day BW, Chu CT (August 2010). "Regulation of the autophagy protein LC3 by phosphorylation". J. Cell Biol. 190 (4): 533–9. doi:10.1083/jcb.201002108. PMC 2928022. PMID 20713600.
10. Shvets E, Fass E, Scherz-Shouval R, Elazar Z (August 2008). "The N-terminus and Phe52 residue of LC3 recruit p62/SQSTM1 into autophagosomes". J. Cell Sci. 121 (Pt 16): 2685–95. doi:10.1242/jcs.026005. PMID 18653543.

Further reading

• Snásel J, Pichová I (1997). "The cleavage of host cell proteins by HIV-1 protease". Folia Biol. (Praha). 42 (5): 227–30. doi:10.1007/BF02818986. PMID 8997639.
• Wallin M, Deinum J, Goobar L, Danielson UH (1990). "Proteolytic cleavage of microtubule-associated proteins by retroviral proteinases". J. Gen. Virol. 71 (9): 1985–91. doi:10.1099/0022-1317-71-9-1985. PMID 2212989.
• Schoenfeld TA, McKerracher L, Obar R, Vallee RB (1989). "MAP 1A and MAP 1B are structurally related microtubule associated proteins with distinct developmental patterns in the CNS". J. Neurosci. 9 (5): 1712–30. doi:10.1523/JNEUROSCI.09-05-01712.1989. PMC 6569839. PMID 2470876.
• Mann SS, Hammarback JA (1994). "Molecular characterization of light chain 3. A microtubule binding subunit of MAP1A and MAP1B". J. Biol. Chem. 269 (15): 11492–7. PMID 7908909.
• Hartley JL, Temple GF, Brasch MA (2001). "DNA Cloning Using In Vitro Site-Specific Recombination". Genome Res. 10 (11): 1788–95. doi:10.1101/gr.143000. PMC 310948. PMID 11076863.
• Wiemann S, Weil B, Wellenreuther R, et al. (2001). "Toward a Catalog of Human Genes and Proteins: Sequencing and Analysis of 500 Novel Complete Protein Coding Human cDNAs". Genome Res. 11 (3): 422–35. doi:10.1101/gr.GR1547R. PMC 311072. PMID 11230166.
• Bonnet C, Boucher D, Lazereg S, et al. (2001). "Differential binding regulation of microtubule-associated proteins MAP1A, MAP1B, and MAP2 by tubulin polyglutamylation". J. Biol. Chem. 276 (16): 12839–48. doi:10.1074/jbc.M011380200. PMID 11278895.
• Deloukas P, Matthews LH, Ashurst J, et al. (2002). "The DNA sequence and comparative analysis of human chromosome 20". Nature. 414 (6866): 865–71. doi:10.1038/414865a. PMID 11780052.
• Strausberg RL, Feingold EA, Grouse LH, et al. (2003). "Generation and initial analysis of more than 15,000 full-length human and mouse cDNA sequences". Proc. Natl. Acad. Sci. U.S.A. 99 (26): 16899–903. doi:10.1073/pnas.242603899. PMC 139241. PMID 12477932.
• He H, Dang Y, Dai F, et al. (2003). "Post-translational modifications of three members of the human MAP1LC3 family and detection of a novel type of modification for MAP1LC3B". J. Biol. Chem. 278 (31): 29278–87. doi:10.1074/jbc.M303800200. PMID 12740394.
• Tanida I, Sou YS, Ezaki J, et al. (2004). "HsAtg4B/HsApg4B/autophagin-1 cleaves the carboxyl termini of three human Atg8 homologues and delipidates microtubule-associated protein light chain 3- and GABAA receptor-associated protein-phospholipid conjugates". J. Biol. Chem. 279 (35): 36268–76. doi:10.1074/jbc.M401461200. PMID 15187094.
• Kouno T, Mizuguchi M, Tanida I, et al. (2005). "1H, 13C, and 15N resonance assignments of human microtubule-associated protein light chain-3". J. Biomol. NMR. 29 (3): 415–6. doi:10.1023/B:JNMR.0000032505.99071.ea. PMID 15213446.
• Goehler H, Lalowski M, Stelzl U, et al. (2004). "A protein interaction network links GIT1, an enhancer of huntingtin aggregation, to Huntington's disease". Mol. Cell. 15 (6): 853–65. doi:10.1016/j.molcel.2004.09.016. PMID 15383276.
• Gerhard DS, Wagner L, Feingold EA, et al. (2004). "The Status, Quality, and Expansion of the NIH Full-Length cDNA Project: The Mammalian Gene Collection (MGC)". Genome Res. 14 (10B): 2121–7. doi:10.1101/gr.2596504. PMC 528928. PMID 15489334.
• Wiemann S, Arlt D, Huber W, et al. (2004). "From ORFeome to Biology: A Functional Genomics Pipeline". Genome Res. 14 (10B): 2136–44. doi:10.1101/gr.2576704. PMC 528930. PMID 15489336.
• Kouno T, Mizuguchi M, Tanida I, et al. (2005). "Solution structure of microtubule-associated protein light chain 3 and identification of its functional subdomains". J. Biol. Chem. 280 (26): 24610–7. doi:10.1074/jbc.M413565200. PMID 15857831.
• Sou YS, Tanida I, Komatsu M, et al. (2006). "Phosphatidylserine in addition to phosphatidylethanolamine is an in vitro target of the mammalian Atg8 modifiers, LC3, GABARAP, and GATE-16". J. Biol. Chem. 281 (6): 3017–24. doi:10.1074/jbc.M505888200. PMID 16303767.
• Mehrle A, Rosenfelder H, Schupp I, et al. (2006). "The LIFEdb database in 2006". Nucleic Acids Res. 34 (Database issue): D415–8. doi:10.1093/nar/gkj139. PMC 1347501. PMID 16381901.