Atg5, Autophagy related 5 or autophagy protein 5 (theoretical molecular weight 32 kDa), belongs to a group of core autophagy-related proteins first identified in yeast and later in eukaryotic cells. Atg proteins play essential roles in the process of macroautophagy. Atg5 is considered a core autophagy protein, for its role in the formation of the autophagosome, a double membrane vesicle which engulfs proteins and organelles for delivery to the lysosome and subsequent degradation (1). Atg5 participates in the process of phagophore elongation by interacting with the ubiquitin-like protein Atg12. Formation of the Atg12-Atg5 conjugate is dependent on the activities of Atg7 (E1 ubiquitin-activating like enzyme) and Atg10 (E2 ubiquitin-activating like enzyme). Non-covalent interaction between the Atg12-Atg5 conjugate and Atg16L1, allows for the formation of a large complex which associates with the nascent phagophore. The Atg16L1 complex dissociates from the autophagosome once it is fully formed (1,2).

In the context of its role in autophagy, Atg5 plays diverse physiologically relevant roles. For example, Atg5 together with Atg7 are required for adipogenesis (3). Recently, Atg5 has been implicated in the process of B-cell receptor polarization and antigen presentation (4). In addition to its role in autophagy, Atg5 is implicated in apoptotic cell death. Interaction of Atg5 with FADD (Fas-associated protein with death domain) is involved in cell death induced by IFN-gamma. A truncated form of Atg5, a 24kDa fragment, leads to cell death by interacting with Bcl-xl and inhibiting its anti-apoptotic activity (5). Other Atg5 interacting partners include interleukin-beta (IL-beta) converting enzyme and nucleotide binding oligomerization domain protein 1, which suggest that Atg5 may play other biologically relevant roles (3).

References

1. Yang, Z., & Klionsky, D. J. (2010). Mammalian autophagy: Core molecular machinery and signaling regulation. Current Opinion in Cell Biology. https://doi.org/10.1016/j.ceb.2009.11.014

2. Rubinsztein, D. C., Shpilka, T., & Elazar, Z. (2012). Mechanisms of autophagosome biogenesis. Current Biology. https://doi.org/10.1016/j.cub.2011.11.034

3. Subramani, S., & Malhotra, V. (2013). Non-autophagic roles of autophagy-related proteins. EMBO Reports. https://doi.org/10.1038/embor.2012.220

4. Arbogast, F., Arnold, J., Hammann, P., Kuhn, L., Chicher, J., Murera, D., Gros, F. (2019). ATG5 is required for B cell polarization and presentation of particulate antigens. Autophagy. https://doi.org/10.1080/15548627.2018.1516327

5. Luo, S., & Rubinsztein, D. C. (2007). Atg5 and Bcl-2 provide novel insights into the interplay between apoptosis and autophagy. Cell Death and Differentiation. https://doi.org/10.1038/sj.cdd.4402149

Long Name

ATG5 Autophagy Related 5 Homolog

Alternate Names

APG5, ASP

Gene Symbol

ATG5

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Product Specific Notices for ATG5 Antibody (ATG5/2101) [Alexa Fluor® 700]

Alexa Fluor (R) products are provided under an intellectual property license from Life Technologies Corporation. The purchase of this product conveys to the buyer the non-transferable right to use the purchased product and components of the product only in research conducted by the buyer (whether the buyer is an academic or for-profit entity). The sale of this product is expressly conditioned on the buyer not using the product or its components, or any materials made using the product or its components, in any activity to generate revenue, which may include, but is not limited to use of the product or its components: (i) in manufacturing; (ii) to provide a service, information, or data in return for payment; (iii) for therapeutic, diagnostic or prophylactic purposes; or (iv) for resale, regardless of whether they are resold for use in research. For information on purchasing a license to this product for purposes other than as described above, contact Life Technologies Corporation, 5791 Van Allen Way, Carlsbad, CA 92008 USA or outlicensing@lifetech.com. This conjugate is made on demand. Actual recovery may vary from the stated volume of this product. The volume will be greater than or equal to the unit size stated on the datasheet.

This product is for research use only and is not approved for use in humans or in clinical diagnosis. Primary Antibodies are guaranteed for 1 year from date of receipt.

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ATG5 Antibody (ATG5/2101) [Alexa Fluor® 700]

Novus Biologicals, part of Bio-Techne | Catalog # NBP3-08504AF700

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Background: ATG5