Natural Sciences and Engineering Research Council (NSERC, Canada)
RGPIN/03031-2022
カナダ
引用
ジャーナル: Nat Commun / 年: 2025 タイトル: Structural basis for allosteric modulation of M. tuberculosis proteasome core particle. 著者: Madison Turner / Adwaith B Uday / Algirdas Velyvis / Enrico Rennella / Natalie Zeytuni / Siavash Vahidi / 要旨: The Mycobacterium tuberculosis (Mtb) proteasome system selectively degrades damaged or misfolded proteins and is crucial for the pathogen's survival within the host. Targeting the 20S core particle ...The Mycobacterium tuberculosis (Mtb) proteasome system selectively degrades damaged or misfolded proteins and is crucial for the pathogen's survival within the host. Targeting the 20S core particle (CP) offers a viable strategy for developing tuberculosis treatments. The activity of Mtb 20S CP, like that of its eukaryotic counterpart, is allosterically regulated, yet the specific conformations involved have not been captured in high-resolution structures to date. Here, we use single-particle electron cryomicroscopy and H/D exchange mass spectrometry to determine the Mtb 20S CP structure in an auto-inhibited state that is distinguished from the canonical resting state by the conformation of switch helices at the α/β interface. The rearrangement of these helices collapses the S1 pocket, effectively inhibiting substrate binding. Biochemical experiments show that the Mtb 20S CP activity can be altered through allosteric sites far from the active site. Our findings underscore the potential of targeting allostery to develop antituberculosis therapeutics.
名称: 20S Proteasome core particle beta subunit / タイプ: protein_or_peptide / ID: 2 詳細: 20S proteasome core particle beta subunit lacking the propeptide (lacking the first 57 residues) and a mutation at the active site Threonine (T1A) 光学異性体: LEVO
モデルのタイプ: NONE / 詳細: Ab-initio model generated in cryoSPARC
最終 再構成
想定した対称性 - 点群: C1 (非対称) / 解像度のタイプ: BY AUTHOR / 解像度: 2.74 Å / 解像度の算出法: FSC 0.143 CUT-OFF / ソフトウェア - 名称: cryoSPARC (ver. 4) 詳細: The particles used are D7 symmetry expanded and the number of particles mentioned is after symmetry expansion. 使用した粒子像数: 615889
初期 角度割当
タイプ: MAXIMUM LIKELIHOOD / ソフトウェア - 名称: cryoSPARC (ver. 4) / 詳細: Homogenous refinement in cryoSPARC
最終 角度割当
タイプ: MAXIMUM LIKELIHOOD / ソフトウェア - 名称: cryoSPARC (ver. 4) 詳細: Local refinement in cryoSPARC using symmetry expanded particles