National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)
AI075039
米国
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)
AI063302
米国
引用
ジャーナル: Science / 年: 2017 タイトル: The structural basis of flagellin detection by NAIP5: A strategy to limit pathogen immune evasion. 著者: Jeannette L Tenthorey / Nicole Haloupek / José Ramón López-Blanco / Patricia Grob / Elise Adamson / Ella Hartenian / Nicholas A Lind / Natasha M Bourgeois / Pablo Chacón / Eva Nogales / Russell E Vance / 要旨: Robust innate immune detection of rapidly evolving pathogens is critical for host defense. Nucleotide-binding domain leucine-rich repeat (NLR) proteins function as cytosolic innate immune sensors in ...Robust innate immune detection of rapidly evolving pathogens is critical for host defense. Nucleotide-binding domain leucine-rich repeat (NLR) proteins function as cytosolic innate immune sensors in plants and animals. However, the structural basis for ligand-induced NLR activation has so far remained unknown. NAIP5 (NLR family, apoptosis inhibitory protein 5) binds the bacterial protein flagellin and assembles with NLRC4 to form a multiprotein complex called an inflammasome. Here we report the cryo-electron microscopy structure of the assembled ~1.4-megadalton flagellin-NAIP5-NLRC4 inflammasome, revealing how a ligand activates an NLR. Six distinct NAIP5 domains contact multiple conserved regions of flagellin, prying NAIP5 into an open and active conformation. We show that innate immune recognition of multiple ligand surfaces is a generalizable strategy that limits pathogen evolution and immune escape.
A: Baculoviral IAP repeat-containing protein 1e B: NLR family CARD domain-containing protein 4 C: NLR family CARD domain-containing protein 4 F: Flagellin
モード: BRIGHT FIELD / 倍率(公称値): 22500 X / 最大 デフォーカス(公称値): 4000 nm / 最小 デフォーカス(公称値): 1800 nm
撮影
平均露光時間: 6 sec. / 電子線照射量: 45.8 e/Å2 フィルム・検出器のモデル: GATAN K2 SUMMIT (4k x 4k) 撮影したグリッド数: 3
画像スキャン
動画フレーム数/画像: 20 / 利用したフレーム数/画像: 1-20
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解析
ソフトウェア
名称: PHENIX / バージョン: 1.11.1_2575: / 分類: 精密化
EMソフトウェア
ID
名称
バージョン
カテゴリ
詳細
1
RELION
1.4
粒子像選択
2
SerialEM
画像取得
4
Gctf
0.5
CTF補正
7
UCSF Chimera
1.10.1
モデルフィッティング
Visualizationandrigidbodyfitting
8
ADP_EM
1.21
モデルフィッティング
Spherical harmonics-based rigid body fitting
9
iMODFIT
1.45
モデルフィッティング
NMA-based flexible fitting
11
EMAN2
2.05
初期オイラー角割当
12
RELION
1.4
最終オイラー角割当
13
RELION
1.4
分類
14
RELION
1.4
3次元再構成
15
PHENIX
1.11.1-2575
モデル精密化
Finalrefinement (phenix.real_space_refine)
16
I-TASSER
5.1
モデル精密化
Initialhomologymodeling
CTF補正
タイプ: PHASE FLIPPING AND AMPLITUDE CORRECTION
粒子像の選択
選択した粒子像数: 856358
対称性
点対称性: C1 (非対称)
3次元再構成
解像度: 5.2 Å / 解像度の算出法: FSC 0.143 CUT-OFF / 粒子像の数: 252214 / 対称性のタイプ: POINT
原子モデル構築
B value: 167 / プロトコル: FLEXIBLE FIT / 空間: REAL / Target criteria: Correlation coefficient 詳細: Homology models predicted by I-TASSER server were used as initial model sources. The main structural template identified by I-TASSER for NAIP5 was the crystal structure of NLRC4 in the ...詳細: Homology models predicted by I-TASSER server were used as initial model sources. The main structural template identified by I-TASSER for NAIP5 was the crystal structure of NLRC4 in the inactive conformation (PDB ID: 4KXF) that covered all the domains except the N-terminal BIR region, where homology models from several BIR domains were recognized (PDB IDs: 1SE0, 2VM5, and 1OXQ for BIR1, BIR2, and BIR3, respectively). Predictions were first rigid body docked into the density map using Chimera and/or ADP_EM. Then, the docked models were flexibly fitted with iMODFIT, if necessary. Finally, all models were refined in Phenix.