5M93

Crystal structure of SdeA-modified ubiquitin.

5M93 の概要

• エントリーDOI: 10.2210/pdb5m93/pdb
• 分子名称: Polyubiquitin-B, SULFATE ION, alpha-D-ribofuranose, ... (4 entities in total)
• 機能のキーワード: post translational modification, ubiquitin, phosphoribosylation, sdea, signaling protein
• 由来する生物種: Homo sapiens (Human)
• 細胞内の位置: Ubiquitin: Cytoplasm : P0CG47
• タンパク質・核酸の鎖数: 3
• 化学式量合計: 27063.65

構造登録者

Kalayil, S.,Bhogaraju, S.,Dikic, I. (登録日: 2016-10-31, 公開日: 2016-12-14, 最終更新日: 2024-11-20)

主引用文献

Bhogaraju, S.,Kalayil, S.,Liu, Y.,Bonn, F.,Colby, T.,Matic, I.,Dikic, I.
Phosphoribosylation of Ubiquitin Promotes Serine Ubiquitination and Impairs Conventional Ubiquitination.
Cell, 167:1636-1649.e13, 2016

PubMed Abstract: Conventional ubiquitination involves the ATP-dependent formation of amide bonds between the ubiquitin C terminus and primary amines in substrate proteins. Recently, SdeA, an effector protein of pathogenic Legionella pneumophila, was shown to mediate NAD-dependent and ATP-independent ubiquitin transfer to host proteins. Here, we identify a phosphodiesterase domain in SdeA that efficiently catalyzes phosphoribosylation of ubiquitin on a specific arginine via an ADP-ribose-ubiquitin intermediate. SdeA also catalyzes a chemically and structurally distinct type of substrate ubiquitination by conjugating phosphoribosylated ubiquitin to serine residues of protein substrates via a phosphodiester bond. Furthermore, phosphoribosylation of ubiquitin prevents activation of E1 and E2 enzymes of the conventional ubiquitination cascade, thereby impairing numerous cellular processes including mitophagy, TNF signaling, and proteasomal degradation. We propose that phosphoribosylation of ubiquitin potently modulates ubiquitin functions in mammalian cells.

PubMed: 27912065
DOI: 10.1016/j.cell.2016.11.019

実験手法

X-RAY DIFFRACTION (1.793 Å)