3w1s
From Proteopedia
Crystal structure of Saccharomyces cerevisiae Atg12-Atg5 conjugate bound to the N-terminal domain of Atg16
Structural highlights
FunctionATG5_YEAST Involved in cytoplasm to vacuole transport (Cvt) and autophagy vesicles formation. Required for ATG8 association to the vesicle membranes.[1] [2] [3] [4] [5] [6] Publication Abstract from PubMedAtg12 is conjugated to Atg5 through enzymatic reactions similar to ubiquitination. The Atg12-Atg5 conjugate functions as an E3-like enzyme to promote lipidation of Atg8, whereas lipidated Atg8 has essential roles in both autophagosome formation and selective cargo recognition during autophagy. However, the molecular role of Atg12 modification in these processes has remained elusive. Here, we report the crystal structure of the Atg12-Atg5 conjugate. In addition to the isopeptide linkage, Atg12 forms hydrophobic and hydrophilic interactions with Atg5, thereby fixing its position on Atg5. Structural comparison with unmodified Atg5 and mutational analyses showed that Atg12 modification neither induces a conformational change in Atg5 nor creates a functionally important architecture. Rather, Atg12 functions as a binding module for Atg3, the E2 enzyme for Atg8, thus endowing Atg5 with the ability to interact with Atg3 to facilitate Atg8 lipidation. Structure of the Atg12-Atg5 conjugate reveals a platform for stimulating Atg8-PE conjugation.,Noda NN, Fujioka Y, Hanada T, Ohsumi Y, Inagaki F EMBO Rep. 2012 Dec 14. doi: 10.1038/embor.2012.208. PMID:23238393[7] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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