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基本情報
登録情報 | データベース: PDB / ID: 9j03 | ||||||
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タイトル | Cyro-EM Structure of Human TLR4/MD-2/DLAM1 Complex | ||||||
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![]() | IMMUNE SYSTEM / Innate immune system / Toll-like receptors / TLR4 agonist / Vaccine adjuvants / Disaccharide-based Lipid A Mimetics | ||||||
機能・相同性 | ![]() detection of fungus / nitric oxide production involved in inflammatory response / MHC class II biosynthetic process / positive regulation of cellular response to macrophage colony-stimulating factor stimulus / lipopolysaccharide immune receptor activity / positive regulation of nucleotide-binding oligomerization domain containing 1 signaling pathway / positive regulation of matrix metallopeptidase secretion / Toll-like receptor 4 binding / lipopolysaccharide receptor complex / detection of lipopolysaccharide ...detection of fungus / nitric oxide production involved in inflammatory response / MHC class II biosynthetic process / positive regulation of cellular response to macrophage colony-stimulating factor stimulus / lipopolysaccharide immune receptor activity / positive regulation of nucleotide-binding oligomerization domain containing 1 signaling pathway / positive regulation of matrix metallopeptidase secretion / Toll-like receptor 4 binding / lipopolysaccharide receptor complex / detection of lipopolysaccharide / regulation of dendritic cell cytokine production / MyD88-independent TLR4 cascade / I-kappaB phosphorylation / negative regulation of interleukin-23 production / TRIF-mediated programmed cell death / cellular response to oxidised low-density lipoprotein particle stimulus / wound healing involved in inflammatory response / B cell proliferation involved in immune response / positive regulation of nucleotide-binding oligomerization domain containing 2 signaling pathway / nucleotide-binding oligomerization domain containing 1 signaling pathway / Caspase activation via Death Receptors in the presence of ligand / Toll Like Receptor 4 (TLR4) Cascade / positive regulation of stress-activated MAPK cascade / intestinal epithelial structure maintenance / positive regulation of interleukin-1 production / macrophage activation / Regulation of TLR by endogenous ligand / TRIF-dependent toll-like receptor signaling pathway / astrocyte development / microglia differentiation / NAD+ nucleosidase activity, cyclic ADP-ribose generating / nucleotide-binding oligomerization domain containing 2 signaling pathway / positive regulation of MHC class II biosynthetic process / positive regulation of macrophage activation / positive regulation of platelet activation / positive regulation of lipopolysaccharide-mediated signaling pathway / negative regulation of interleukin-17 production / positive regulation of cytokine production involved in inflammatory response / MyD88 deficiency (TLR2/4) / positive regulation of extrinsic apoptotic signaling pathway / positive regulation of chemokine (C-X-C motif) ligand 2 production / negative regulation of cold-induced thermogenesis / IRAK4 deficiency (TLR2/4) / positive regulation of macrophage cytokine production / MyD88-dependent toll-like receptor signaling pathway / MyD88:MAL(TIRAP) cascade initiated on plasma membrane / T-helper 1 type immune response / toll-like receptor 4 signaling pathway / toll-like receptor signaling pathway / positive regulation of smooth muscle cell migration / positive regulation of reactive oxygen species biosynthetic process / positive regulation of NLRP3 inflammasome complex assembly / RSV-host interactions / negative regulation of osteoclast differentiation / cellular response to lipoteichoic acid / negative regulation of interleukin-6 production / positive regulation of interferon-alpha production / negative regulation of type II interferon production / Respiratory syncytial virus (RSV) attachment and entry / positive regulation of interleukin-10 production / negative regulation of tumor necrosis factor production / phagocytic cup / phagocytosis / stress-activated MAPK cascade / positive regulation of chemokine production / ruffle / JNK cascade / cellular response to platelet-derived growth factor stimulus / positive regulation of B cell proliferation / nitric oxide biosynthetic process / positive regulation of interleukin-12 production / Regulation of TBK1, IKKε (IKBKE)-mediated activation of IRF3, IRF7 / ERK1 and ERK2 cascade / positive regulation of MAP kinase activity / IRAK2 mediated activation of TAK1 complex upon TLR7/8 or 9 stimulation / TRAF6-mediated induction of TAK1 complex within TLR4 complex / positive regulation of interferon-beta production / lipopolysaccharide-mediated signaling pathway / Activation of IRF3, IRF7 mediated by TBK1, IKKε (IKBKE) / positive regulation of interleukin-1 beta production / IKK complex recruitment mediated by RIP1 / positive regulation of interleukin-8 production / positive regulation of smooth muscle cell proliferation / positive regulation of JNK cascade / lipopolysaccharide binding / Heme signaling / positive regulation of non-canonical NF-kappaB signal transduction / negative regulation of ERK1 and ERK2 cascade / cellular response to type II interferon / positive regulation of interleukin-6 production / positive regulation of type II interferon production / cellular response to mechanical stimulus / positive regulation of inflammatory response / cellular response to amyloid-beta / positive regulation of NF-kappaB transcription factor activity / positive regulation of tumor necrosis factor production / positive regulation of nitric oxide biosynthetic process / transmembrane signaling receptor activity / signaling receptor activity / amyloid-beta binding 類似検索 - 分子機能 | ||||||
生物種 | ![]() | ||||||
手法 | 電子顕微鏡法 / 単粒子再構成法 / クライオ電子顕微鏡法 / 解像度: 2.7 Å | ||||||
![]() | Fu, Y. / Kim, H. / Zamyatina, A. / Kim, H.M. | ||||||
資金援助 | 1件
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![]() | ![]() タイトル: Structural insight into TLR4/MD-2 activation by synthetic LPS mimetics with distinct binding modes. 著者: Yaoyao Fu / Hyojin Kim / Dong Sun Lee / Ah-Reum Han / Holger Heine / Alla Zamyatina / Ho Min Kim / ![]() ![]() ![]() 要旨: The mammalian pattern-recognition receptor TLR4/MD-2 (Toll-like receptor 4/myeloid differentiation factor-2) can be activated by a wide variety of pathogen-associated and endogenous molecules, with ...The mammalian pattern-recognition receptor TLR4/MD-2 (Toll-like receptor 4/myeloid differentiation factor-2) can be activated by a wide variety of pathogen-associated and endogenous molecules, with Gram-negative bacterial lipopolysaccharide (LPS) being the primary natural TLR4 agonist. Activation of TLR4 triggers cellular signaling that enables the beneficial innate immune responses and enhances adaptive immunity, thereby emphasizing the potential of TLR4 agonists for the management of diseases with an immunopathological background and for use as vaccine adjuvants. Given the challenges associated with LPS-derived products, including structural complexity, heterogeneity, toxicity, and species specificity, synthetic molecules targeting TLR4/MD-2 offer a promising alternative. Here, we elucidate the structural basis for the recognition of synthetic LPS-mimicking glycolipids, Disaccharide Lipid A Mimetics (DLAMs), by human and mouse TLR4/MD-2 through cryo-EM structures of six dimeric [TLR4/MD-2/ligand] complexes resolved at 2.2-3.1 Å. We reveal that the specific binding modes of DLAMs, distinct from those of LPS, are essential for the species-independent TLR4 agonistic activity. DLAMs function as a molecular bridge, effectively induce the dimerization of TLR4/MD-2 complexes through specific carbohydrate structure-relevant ligand-protein interactions. Our findings reveal the distinct molecular modes of TLR4 activation, and provide a structural basis for the rationale design and development of innovative, highly potent TLR4-targeting immunotherapeutics and adjuvants. | ||||||
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構造の表示
構造ビューア | 分子: ![]() ![]() |
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ダウンロードとリンク
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PDBx/mmCIF形式 | ![]() | 280.1 KB | 表示 | ![]() |
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PDB形式 | ![]() | 225.5 KB | 表示 | ![]() |
PDBx/mmJSON形式 | ![]() | ツリー表示 | ![]() | |
その他 | ![]() |
-検証レポート
アーカイブディレクトリ | ![]() ![]() | HTTPS FTP |
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-関連構造データ
関連構造データ | ![]() 61047MC ![]() 8wo1C ![]() 8wqtC ![]() 8wryC ![]() 8wsaC ![]() 8wtaC C: 同じ文献を引用 ( M: このデータのモデリングに利用したマップデータ |
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類似構造データ | 類似検索 - 機能・相同性 ![]() |
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リンク
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集合体
登録構造単位 | ![]()
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要素
-タンパク質 , 2種, 4分子 CDBA
#1: タンパク質 | 分子量: 16385.941 Da / 分子数: 2 / 由来タイプ: 組換発現 / 由来: (組換発現) ![]() ![]() #2: タンパク質 | 分子量: 68838.328 Da / 分子数: 2 / 由来タイプ: 組換発現 / 由来: (組換発現) ![]() ![]() |
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-糖 , 6種, 16分子 


#3: 多糖 | #4: 多糖 | #5: 多糖 | #7: 糖 | ChemComp-NAG / #8: 糖 | #9: 糖 | タイプ: D-saccharide, alpha linking / 分子量: 274.162 Da / 分子数: 2 / 由来タイプ: 合成 / 式: C7H15O9P / タイプ: SUBJECT OF INVESTIGATION |
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-非ポリマー , 1種, 6分子 
#6: 化合物 | ChemComp-2IL / ( |
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-詳細
研究の焦点であるリガンドがあるか | Y |
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Has protein modification | Y |
-実験情報
-実験
実験 | 手法: 電子顕微鏡法 |
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EM実験 | 試料の集合状態: PARTICLE / 3次元再構成法: 単粒子再構成法 |
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試料調製
構成要素 | 名称: human TLR4/MD-2/DLAM1 complex / タイプ: COMPLEX / Entity ID: #1-#2 / 由来: RECOMBINANT | |||||||||||||||
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分子量 | 実験値: NO | |||||||||||||||
由来(天然) | 生物種: ![]() | |||||||||||||||
由来(組換発現) | 生物種: ![]() | |||||||||||||||
緩衝液 | pH: 8 | |||||||||||||||
緩衝液成分 |
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試料 | 包埋: NO / シャドウイング: NO / 染色: NO / 凍結: YES | |||||||||||||||
試料支持 | 詳細: 10mA / グリッドの材料: COPPER / グリッドのサイズ: 300 divisions/in. / グリッドのタイプ: Quantifoil R1.2/1.3 | |||||||||||||||
急速凍結 | 凍結剤: ETHANE |
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電子顕微鏡撮影
実験機器 | ![]() モデル: Titan Krios / 画像提供: FEI Company |
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顕微鏡 | モデル: TFS KRIOS |
電子銃 | 電子線源: ![]() |
電子レンズ | モード: BRIGHT FIELD / 倍率(公称値): 105000 X / 倍率(補正後): 58962 X / 最大 デフォーカス(公称値): 1700 nm / 最小 デフォーカス(公称値): 700 nm / Cs: 2.7 mm |
試料ホルダ | 凍結剤: NITROGEN |
撮影 | 電子線照射量: 67.8 e/Å2 フィルム・検出器のモデル: GATAN K3 BIOQUANTUM (6k x 4k) 撮影したグリッド数: 1 / 実像数: 13308 |
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解析
EMソフトウェア | 名称: PHENIX |
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CTF補正 | タイプ: PHASE FLIPPING AND AMPLITUDE CORRECTION |
対称性 | 点対称性: C2 (2回回転対称) |
3次元再構成 | 解像度: 2.7 Å / 解像度の算出法: FSC 0.143 CUT-OFF / 粒子像の数: 181542 / 対称性のタイプ: POINT |
精密化 | 最高解像度: 2.7 Å |