- EMDB-63355: Cryo-EM structure of the wild-type diabody complex (CitS-diabody ... -
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基本情報
登録情報
データベース: EMDB / ID: EMD-63355
タイトル
Cryo-EM structure of the wild-type diabody complex (CitS-diabody #1-TLR3)
マップデータ
試料
複合体: CitS-diabody #1-TLR3 complex
複合体: CitS
タンパク質・ペプチド: Citrate/sodium symporter
複合体: TLR3
タンパク質・ペプチド: Toll-like receptor 3
複合体: Diabody
タンパク質・ペプチド: Diabody (CitS VH-TLR3 VL)
タンパク質・ペプチド: Diabody (TLR3 VH-CitS VL)
リガンド: CITRIC ACID
リガンド: PALMITIC ACID
リガンド: 2-acetamido-2-deoxy-beta-D-glucopyranose
キーワード
Disulfide-bridged diabody / cryo-electron microscopy (cryo-EM) / small protein imaging / structural marker / antibody engineering / protein nanotechnology / STRUCTURAL PROTEIN / STRUCTURAL PROTEIN-IMMUNE SYSTEM complex
機能・相同性
機能・相同性情報
TLR3 deficiency - HSE / response to dsRNA / UNC93B1 deficiency - HSE / type III interferon production / positive regulation of type III interferon production / TICAM1 deficiency - HSE / TRAF3 deficiency - HSE / regulation of dendritic cell cytokine production / Toll Like Receptor 3 (TLR3) Cascade / citrate metabolic process ...TLR3 deficiency - HSE / response to dsRNA / UNC93B1 deficiency - HSE / type III interferon production / positive regulation of type III interferon production / TICAM1 deficiency - HSE / TRAF3 deficiency - HSE / regulation of dendritic cell cytokine production / Toll Like Receptor 3 (TLR3) Cascade / citrate metabolic process / TLR3-mediated TICAM1-dependent programmed cell death / inflammatory response to wounding / activation of NF-kappaB-inducing kinase activity / toll-like receptor 3 signaling pathway / detection of virus / necroptotic signaling pathway / symporter activity / organic anion transmembrane transporter activity / RIP-mediated NFkB activation via ZBP1 / endolysosome membrane / positive regulation of cytokine production involved in inflammatory response / Trafficking and processing of endosomal TLR / hyperosmotic response / positive regulation of macrophage cytokine production / toll-like receptor signaling pathway / sodium ion transport / pattern recognition receptor activity / cellular response to exogenous dsRNA / RSV-host interactions / response to exogenous dsRNA / negative regulation of osteoclast differentiation / ubiquitin-like protein ligase binding / positive regulation of interferon-alpha production / Regulation of TBK1, IKKε-mediated activation of IRF3, IRF7 upon TLR3 ligation / TICAM1,TRAF6-dependent induction of TAK1 complex / TICAM1-dependent activation of IRF3/IRF7 / cellular response to interferon-beta / positive regulation of chemokine production / extrinsic apoptotic signaling pathway / JNK cascade / TICAM1, RIP1-mediated IKK complex recruitment / positive regulation of interleukin-12 production / extracellular matrix / positive regulation of interferon-beta production / positive regulation of interleukin-8 production / positive regulation of JNK cascade / microglial cell activation / cellular response to virus / cellular response to type II interferon / positive regulation of interleukin-6 production / cellular response to mechanical stimulus / positive regulation of type II interferon production / positive regulation of inflammatory response / positive regulation of angiogenesis / male gonad development / positive regulation of tumor necrosis factor production / cellular response to xenobiotic stimulus / transmembrane signaling receptor activity / signaling receptor activity / double-stranded RNA binding / defense response to virus / early endosome / positive regulation of canonical NF-kappaB signal transduction / endosome membrane / defense response to bacterium / positive regulation of apoptotic process / Golgi membrane / lysosomal membrane / innate immune response / endoplasmic reticulum membrane / positive regulation of gene expression / signal transduction / positive regulation of transcription by RNA polymerase II / extracellular space / metal ion binding / identical protein binding / membrane / plasma membrane / cytoplasm 類似検索 - 分子機能
ジャーナル: Structure / 年: 2025 タイトル: Disulfide-stabilized diabodies enable near-atomic cryo-EM imaging of small proteins: A case study of the bacterial Na/citrate symporter CitS. 著者: Subin Kim / Ji Won Kim / Jun Gyou Park / Sang Soo Lee / Seung Hun Choi / Jie-Oh Lee / Mi Sun Jin / 要旨: Diabodies are engineered antibody fragments with two antigen-binding Fv domains. Previously, we demonstrated that they are often highly flexible but can be rigidified by introducing a disulfide bond ...Diabodies are engineered antibody fragments with two antigen-binding Fv domains. Previously, we demonstrated that they are often highly flexible but can be rigidified by introducing a disulfide bond at the Fv interface. In this study, we explored the potential of disulfide-bridged, bispecific diabodies for near-atomic cryoelectron microscopy (cryo-EM) imaging of small proteins because they can predictably link target proteins to "structural marker" proteins. As a case study, we used the bacterial citrate transporter CitS as the target protein, and the horseshoe-shaped ectodomain of human Toll-like receptor 3 (TLR3) as the marker. We show that diabodies containing one or two disulfide bonds enabled the 3D reconstruction of CitS at resolutions of 3.3 Å and 3.1 Å, respectively. This resolution surpassed previous crystallographic results and allowed us to visualize the high-resolution structural features of the transporter. Our work expands the application of diabodies in structural biology to address a key limitation in the field.