9D5B

Structure of Methylobacterium brachiatum multi-ubiquitin protein filament

9D5B の概要

• エントリーDOI: 10.2210/pdb9d5b/pdb
• EMDBエントリー: 46578
• 分子名称: Multi-ubiquitin domain-containing protein, CALCIUM ION (2 entities in total)
• 機能のキーワード: ubiquitin, filament, beta-grasp, protein binding
• 由来する生物種: Methylobacterium brachiatum
• タンパク質・核酸の鎖数: 4
• 化学式量合計: 117247.30

構造登録者

Gong, M.,Gu, Y.,Corbett, K.D. (登録日: 2024-08-13, 公開日: 2025-04-02, 最終更新日: 2025-06-18)

主引用文献

Gong, M.,Ye, Q.,Gu, Y.,Chambers, L.R.,Bobkov, A.A.,Arakawa, N.K.,Matyszewski, M.,Corbett, K.D.
Structural diversity and oligomerization of bacterial ubiquitin-like proteins.
Structure, 33:1016-1026.e4, 2025

PubMed Abstract: Bacteria possess a variety of operons with homology to eukaryotic ubiquitination pathways that encode predicted E1, E2, E3, deubiquitinase, and ubiquitin-like proteins. Some of these pathways have recently been shown to function in anti-bacteriophage immunity, but the biological functions of others remain unknown. Here, we show that ubiquitin-like proteins in two bacterial operon families show surprising architectural diversity, possessing one to three β-grasp domains preceded by diverse N-terminal domains. We find that a large group of bacterial ubiquitin-like proteins possess three β-grasp domains and form homodimers and helical filaments mediated by conserved Ca ion binding sites. Our findings highlight a distinctive mode of self-assembly for ubiquitin-like proteins and suggest that Ca-mediated ubiquitin-like protein filament assembly and/or disassembly enables cells to sense and respond to stress conditions that alter intracellular metal ion concentration.

PubMed: 40250427
DOI: 10.1016/j.str.2025.03.011

実験手法

ELECTRON MICROSCOPY (3.08 Å)