6CM9

Structure of the cargo bound AP-1:Arf1:tetherin-Nef closed trimer monomeric subunit

6CM9 の概要

• エントリーDOI: 10.2210/pdb6cm9/pdb
• EMDBエントリー: 7457
• 分子名称: Bone marrow stromal antigen 2, Protein Nef chimera, AP-1 complex subunit beta-1, ADP-ribosylation factor 1, ... (8 entities in total)
• 機能のキーワード: ap, hiv, nef, trafficking, viral protein, protein transport
• 由来する生物種: Homo sapiens (Human); 詳細
• タンパク質・核酸の鎖数: 9
• 化学式量合計: 336891.16

構造登録者

Morris, K.L.,Buffalo, C.Z.,Ren, X.,Hurley, J.H. (登録日: 2018-03-03, 公開日: 2018-08-08, 最終更新日: 2024-03-13)

主引用文献

Morris, K.L.,Buffalo, C.Z.,Sturzel, C.M.,Heusinger, E.,Kirchhoff, F.,Ren, X.,Hurley, J.H.
HIV-1 Nefs Are Cargo-Sensitive AP-1 Trimerization Switches in Tetherin Downregulation.
Cell, 174:659-671.e14, 2018

PubMed Abstract: The HIV accessory protein Nef counteracts immune defenses by subverting coated vesicle pathways. The 3.7 Å cryo-EM structure of a closed trimer of the clathrin adaptor AP-1, the small GTPase Arf1, HIV-1 Nef, and the cytosolic tail of the restriction factor tetherin suggested a mechanism for inactivating tetherin by Golgi retention. The 4.3 Å structure of a mutant Nef-induced dimer of AP-1 showed how the closed trimer is regulated by the dileucine loop of Nef. HDX-MS and mutational analysis were used to show how cargo dynamics leads to alternative Arf1 trimerization, directing Nef targets to be either retained at the trans-Golgi or sorted to lysosomes. Phosphorylation of the NL4-3 M-Nef was shown to regulate AP-1 trimerization, explaining how O-Nefs lacking this phosphosite counteract tetherin but most M-Nefs do not. These observations show how the higher-order organization of a vesicular coat can be allosterically modulated to direct cargoes to distinct fates.

PubMed: 30053425
DOI: 10.1016/j.cell.2018.07.004

実験手法

ELECTRON MICROSCOPY (3.73 Å)