Autophagy-related protein 3 - A1CAN8 (ATG3_ASPCL)


Protein Feature View of PDB entries mapped to a UniProtKB sequence  

E2 conjugating enzyme required for the cytoplasm to vacuole transport (Cvt) and autophagy. Required for selective autophagic degradation of the nucleus (nucleophagy) as well as for mitophagy which contributes to regulate mitochondrial quantity and quality by eliminating the mitochondria to a basal level to fulfill cellular energy requirements and preventing excess ROS production. Responsible for the E2-like covalent binding of phosphatidylethanolamine to the C-terminal Gly of atg8. The atg12-atg5 conjugate plays a role of an E3 and promotes the transfer of atg8 from atg3 to phosphatidylethanolamine (PE). This step is required for the membrane association of atg8. The formation of the atg8-phosphatidylethanolamine conjugate is essential for autophagy and for the cytoplasm to vacuole transport (Cvt). The atg8-PE conjugate mediates tethering between adjacent membranes and stimulates membrane hemifusion, leading to expansion of the autophagosomal membrane during autophagy. (data source: UniProt  )
Subunit structure
Monomer. Interacts with atg8 through an intermediate thioester bond through the C-terminal Gly of atg8. Also interacts with the 40 amino acid C-terminal region of the E1-like atg7 enzyme. Interacts also with the atg12-atg5 conjugate. (data source: UniProt  )
The handle region (HR) contains the atg8 interaction motif (AIM) and mediates binding to atg8. It is crucial for the cytoplasm-to-vacuole targeting pathway. (data source: UniProt  )
Other Gene names: atg3 ACLA_012340
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The PDB to UniProt mapping is based on the data provided by the EBI SIFTS project. See also Velankar et al., Nucleic Acids Research 33, D262-265 (2005).
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