8AFW

Tube assembly of Atg18-WT

8AFW の概要

• エントリーDOI: 10.2210/pdb8afw/pdb
• EMDBエントリー: 15410
• 分子名称: Autophagy-related protein 18 (1 entity in total)
• 機能のキーワード: autophagy, membrane remodeling, pip binding, pi3p, pi(3, 5)p2, lipid binding protein, membrane protein
• 由来する生物種: Saccharomyces cerevisiae (baker's yeast)
• タンパク質・核酸の鎖数: 4
• 化学式量合計: 220631.72

構造登録者

Mann, D.,Fromm, S.,Martinez-Sanchez, A.,Gopaldass, N.,Mayer, A.,Sachse, C. (登録日: 2022-07-18, 公開日: 2023-11-01, 最終更新日: 2024-05-15)

主引用文献

Mann, D.,Fromm, S.A.,Martinez-Sanchez, A.,Gopaldass, N.,Choy, R.,Mayer, A.,Sachse, C.
Atg18 oligomer organization in assembled tubes and on lipid membrane scaffolds.
Nat Commun, 14:8086-8086, 2023

PubMed Abstract: Autophagy-related protein 18 (Atg18) participates in the elongation of early autophagosomal structures in concert with Atg2 and Atg9 complexes. How Atg18 contributes to the structural coordination of Atg2 and Atg9 at the isolation membrane remains to be understood. Here, we determined the cryo-EM structures of Atg18 organized in helical tubes, Atg18 oligomers in solution as well as on lipid membrane scaffolds. The helical assembly is composed of Atg18 tetramers forming a lozenge cylindrical lattice with remarkable structural similarity to the COPII outer coat. When reconstituted with lipid membranes, using subtomogram averaging we determined tilted Atg18 dimer structures bridging two juxtaposed lipid membranes spaced apart by 80 Å. Moreover, lipid reconstitution experiments further delineate the contributions of Atg18's FRRG motif and the amphipathic helical extension in membrane interaction. The observed structural plasticity of Atg18's oligomeric organization and membrane binding properties provide a molecular framework for the positioning of downstream components of the autophagy machinery.

PubMed: 38057304
DOI: 10.1038/s41467-023-43460-3

実験手法

ELECTRON MICROSCOPY (3.8 Å)