RRC ID 70352
著者 Chino H, Yamasaki A, Ode KL, Ueda HR, Noda NN, Mizushima N.
タイトル Phosphorylation by casein kinase 2 enhances the interaction between ER-phagy receptor TEX264 and ATG8 proteins.
ジャーナル EMBO Rep
Abstract Selective autophagy cargos are recruited to autophagosomes primarily by interacting with autophagosomal ATG8 family proteins via the LC3-interacting region (LIR). The upstream sequence of most LIRs contains negatively charged residues such as Asp, Glu, and phosphorylated Ser and Thr. However, the significance of LIR phosphorylation (compared with having acidic amino acids) and the structural basis of phosphorylated LIR-ATG8 binding are not entirely understood. Here, we show that the serine residues upstream of the core LIR of the endoplasmic reticulum (ER)-phagy receptor TEX264 are phosphorylated by casein kinase 2, which is critical for its interaction with ATG8s, autophagosomal localization, and ER-phagy. Structural analysis shows that phosphorylation of these serine residues increases binding affinity by producing multiple hydrogen bonds with ATG8s that cannot be mimicked by acidic residues. This binding mode is different from those of other ER-phagy receptors that utilize a downstream helix, which is absent from TEX264, to increase affinity. These results suggest that phosphorylation of the LIR is critically important for strong LIR-ATG8 interactions, even in the absence of auxiliary interactions.
巻・号 23(6)
ページ e54801
公開日 2022-6-7
DOI 10.15252/embr.202254801
PMID 35417087
PMC PMC9171416
MeSH Autophagy Autophagy-Related Protein 8 Family / chemistry Carrier Proteins / metabolism Casein Kinase II* / metabolism Endoplasmic Reticulum / metabolism Microtubule-Associated Proteins* / metabolism Phosphorylation Serine / metabolism
IF 7.497
リソース情報
ヒト・動物細胞 293T(RCB2202) HeLa(RCB0007)