6RFP

ERK2 MAP kinase with mutations at Helix-G

6RFP の概要

• エントリーDOI: 10.2210/pdb6rfp/pdb
• 分子名称: Mitogen-activated protein kinase 1 (2 entities in total)
• 機能のキーワード: nled, effectors, t3ss, map kinase, phosphorylation, transferase
• 由来する生物種: Rattus norvegicus (Rat)
• タンパク質・核酸の鎖数: 1
• 化学式量合計: 43425.74

構造登録者

Livnah, O.,Eitan-Wexler, M. (登録日: 2019-04-16, 公開日: 2020-05-13, 最終更新日: 2024-01-24)

主引用文献

Gur-Arie, L.,Eitan-Wexler, M.,Weinberger, N.,Rosenshine, I.,Livnah, O.
The bacterial metalloprotease NleD selectively cleaves mitogen-activated protein kinases that have high flexibility in their activation loop.
J.Biol.Chem., 295:9409-9420, 2020

PubMed Abstract: Microbial pathogens often target the host mitogen-activated protein kinase (MAPK) network to suppress host immune responses. We previously identified a bacterial type III secretion system effector, termed NleD, a metalloprotease that inactivates MAPKs by specifically cleaving their activation loop. Here, we show that NleDs form a growing family of virulence factors harbored by human and plant pathogens as well as insect symbionts. These NleDs disable specifically Jun N-terminal kinases (JNKs) and p38s that are required for host immune response, whereas extracellular signal-regulated kinase (ERK), which is essential for host cell viability, remains intact. We investigated the mechanism that makes ERK resistant to NleD cleavage. Biochemical and structural analyses revealed that NleD exclusively targets activation loops with high conformational flexibility. Accordingly, NleD cleaved the flexible loops of JNK and p38 but not the rigid loop of ERK. Our findings elucidate a compelling mechanism of native substrate proteolysis that is promoted by entropy-driven specificity. We propose that such entropy-based selectivity is a general attribute of proteolytic enzymes.

PubMed: 32404367
DOI: 10.1074/jbc.RA120.013590

実験手法

X-RAY DIFFRACTION (1.74 Å)