6MUV

The structure of the Plasmodium falciparum 20S proteasome in complex with two PA28 activators

6MUV の概要

• エントリーDOI: 10.2210/pdb6muv/pdb
• 関連するPDBエントリー: 6DFK 6MUW 6MUX
• EMDBエントリー: 9257 9258 9259
• 分子名称: 20S proteasome alpha-1 subunit, 20S proteasome beta-3 subunit, 20S proteasome beta-4 subunit, ... (15 entities in total)
• 機能のキーワード: proteasome, protease, hydrolase, 11s subunit, hydrolyse activator, proteasome activator, complex
• 由来する生物種: Plasmodium falciparum (isolate 3D7); 詳細
• タンパク質・核酸の鎖数: 42
• 化学式量合計: 1227393.13

構造登録者

Metcalfe, R.D.,Xie, S.C.,Hanssen, E.,Gillett, D.L.,Leis, A.P.,Tilley, L.,Griffin, M.D.W. (登録日: 2018-10-23, 公開日: 2019-08-07, 最終更新日: 2024-03-13)

主引用文献

Xie, S.C.,Metcalfe, R.D.,Hanssen, E.,Yang, T.,Gillett, D.L.,Leis, A.P.,Morton, C.J.,Kuiper, M.J.,Parker, M.W.,Spillman, N.J.,Wong, W.,Tsu, C.,Dick, L.R.,Griffin, M.D.W.,Tilley, L.
The structure of the PA28-20S proteasome complex from Plasmodium falciparum and implications for proteostasis.
Nat Microbiol, 4:1990-2000, 2019

PubMed Abstract: The activity of the proteasome 20S catalytic core is regulated by protein complexes that bind to one or both ends. The PA28 regulator stimulates 20S proteasome peptidase activity in vitro, but its role in vivo remains unclear. Here, we show that genetic deletion of the PA28 regulator from Plasmodium falciparum (Pf) renders malaria parasites more sensitive to the antimalarial drug dihydroartemisinin, indicating that PA28 may play a role in protection against proteotoxic stress. The crystal structure of PfPA28 reveals a bell-shaped molecule with an inner pore that has a strong segregation of charges. Small-angle X-ray scattering shows that disordered loops, which are not resolved in the crystal structure, extend from the PfPA28 heptamer and surround the pore. Using single particle cryo-electron microscopy, we solved the structure of Pf20S in complex with one and two regulatory PfPA28 caps at resolutions of 3.9 and 3.8 Å, respectively. PfPA28 binds Pf20S asymmetrically, strongly engaging subunits on only one side of the core. PfPA28 undergoes rigid body motions relative to Pf20S. Molecular dynamics simulations support conformational flexibility and a leaky interface. We propose lateral transfer of short peptides through the dynamic interface as a mechanism facilitating the release of proteasome degradation products.

PubMed: 31384003
DOI: 10.1038/s41564-019-0524-4

実験手法

ELECTRON MICROSCOPY (3.8 Å)