8ALK

Structure of the Legionella phosphocholine hydrolase Lem3 in complex with its substrate Rab1

8ALK の概要

• エントリーDOI: 10.2210/pdb8alk/pdb
• 関連するPDBエントリー: 8AGG
• 分子名称: Phosphocholine hydrolase Lem3, Ras-related protein Rab-1B, CALCIUM ION, ... (6 entities in total)
• 機能のキーワード: bacterial effector, dephosphocholinase, legionella pneumophila, hydrolase
• 由来する生物種: Legionella pneumophila; 詳細
• タンパク質・核酸の鎖数: 2
• 化学式量合計: 73838.37

構造登録者

Kaspers, M.S.,Pett, C.,Hedberg, C.,Itzen, A.,Pogenberg, V. (登録日: 2022-08-01, 公開日: 2023-04-12, 最終更新日: 2024-11-20)

主引用文献

Kaspers, M.S.,Pogenberg, V.,Pett, C.,Ernst, S.,Ecker, F.,Ochtrop, P.,Groll, M.,Hedberg, C.,Itzen, A.
Dephosphocholination by Legionella effector Lem3 functions through remodelling of the switch II region of Rab1b.
Nat Commun, 14:2245-2245, 2023

PubMed Abstract: Bacterial pathogens often make use of post-translational modifications to manipulate host cells. Legionella pneumophila, the causative agent of Legionnaires disease, secretes the enzyme AnkX that uses cytidine diphosphate-choline to post-translationally modify the human small G-Protein Rab1 with a phosphocholine moiety at Ser76. Later in the infection, the Legionella enzyme Lem3 acts as a dephosphocholinase, hydrolytically removing the phosphocholine. While the molecular mechanism for Rab1 phosphocholination by AnkX has recently been resolved, structural insights into the activity of Lem3 remained elusive. Here, we stabilise the transient Lem3:Rab1b complex by substrate mediated covalent capture. Through crystal structures of Lem3 in the apo form and in complex with Rab1b, we reveal Lem3's catalytic mechanism, showing that it acts on Rab1 by locally unfolding it. Since Lem3 shares high structural similarity with metal-dependent protein phosphatases, our Lem3:Rab1b complex structure also sheds light on how these phosphatases recognise protein substrates.

PubMed: 37076474
DOI: 10.1038/s41467-023-37621-7

実験手法

X-RAY DIFFRACTION (2.15 Å)