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データを開く
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基本情報
登録情報 | データベース: PDB / ID: 8zo4 | ||||||
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タイトル | Crystal structure of Tfh TCR ectodomain thermostable mutant | ||||||
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![]() | IMMUNE SYSTEM / T cell receptor / ecotodomain / thermostable mutant | ||||||
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手法 | ![]() ![]() ![]() | ||||||
![]() | Mori, S. / Nagae, M. / Yamasaki, S. | ||||||
資金援助 | ![]()
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![]() | ![]() タイトル: A conserved human CD4+ T cell subset recognizing the mycobacterial adjuvant trehalose monomycolate. 著者: Yuki Sakai / Minori Asa / Mika Hirose / Wakana Kusuhara / Nagatoshi Fujiwara / Hiroto Tamashima / Takahiro Ikazaki / Shiori Oka / Kota Kuraba / Kentaro Tanaka / Takashi Yoshiyama / Masamichi ...著者: Yuki Sakai / Minori Asa / Mika Hirose / Wakana Kusuhara / Nagatoshi Fujiwara / Hiroto Tamashima / Takahiro Ikazaki / Shiori Oka / Kota Kuraba / Kentaro Tanaka / Takashi Yoshiyama / Masamichi Nagae / Yoshihiko Hoshino / Daisuke Motooka / Ildiko Van Rhijn / Xiuyuan Lu / Eri Ishikawa / D Branch Moody / Takayuki Kato / Shinsuke Inuki / Go Hirai / Sho Yamasaki / ![]() ![]() ![]() 要旨: Mycobacterium tuberculosis causes human tuberculosis (TB). As mycobacteria are protected by a thick lipid cell wall, humans have developed immune responses against diverse mycobacterial lipids. Most ...Mycobacterium tuberculosis causes human tuberculosis (TB). As mycobacteria are protected by a thick lipid cell wall, humans have developed immune responses against diverse mycobacterial lipids. Most of these immunostimulatory lipids are known as adjuvants acting through innate immune receptors, such as C-type lectin receptors. Although a few mycobacterial lipid antigens activate unconventional T cells, the antigenicity of most adjuvantic lipids is unknown. Here, we identified that trehalose monomycolate (TMM), an abundant mycobacterial adjuvant, activated human T cells bearing a unique αβ T cell receptor (αβTCR). This recognition was restricted by CD1b, a monomorphic antigen-presenting molecule conserved in primates but not mice. Single-cell TCR-RNA-Seq using newly established CD1b-TMM tetramers revealed that TMM-specific T cells were present as CD4+ effector memory T cells in the periphery of uninfected donors but expressed IFN-γ, TNF, and anti-mycobacterial effectors upon TMM stimulation. TMM-specific T cells were detected in cord blood and PBMCs of donors without bacillus Calmette-Guérin vaccination but were expanded in patients with active TB. A cryo-electron microscopy study of CD1b-TMM-TCR complexes revealed unique antigen recognition by conserved features of TCRs, positively charged CDR3α, and long CDR3β regions. These results indicate that humans have a commonly shared and preformed CD4+ T cell subset recognizing a typical mycobacterial adjuvant as an antigen. Furthermore, the dual role of TMM justifies reconsideration of the mechanism of action of adjuvants. | ||||||
履歴 |
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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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ダウンロード
PDBx/mmCIF形式 | ![]() | 225.2 KB | 表示 | ![]() |
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PDB形式 | ![]() | 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
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リンク
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集合体
登録構造単位 | ![]()
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単位格子 |
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要素
#1: タンパク質 | 分子量: 28089.523 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: 27331.410 Da / 分子数: 2 / 由来タイプ: 組換発現 / 由来: (組換発現) ![]() ![]() #3: 糖 | ChemComp-NAG / | #4: 化合物 | ChemComp-SO4 / #5: 水 | ChemComp-HOH / | 研究の焦点であるリガンドがあるか | N | Has protein modification | Y | |
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-実験情報
-実験
実験 | 手法: ![]() |
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試料調製
結晶 | マシュー密度: 2.28 Å3/Da / 溶媒含有率: 46.02 % |
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結晶化 | 温度: 293 K / 手法: 蒸気拡散法, シッティングドロップ法 / pH: 5.5 詳細: 0.1M Bis-tris (pH 5.5), 0.2M Potassium sulfate, 25% PEG 3350 |
-データ収集
回折 | 平均測定温度: 95 K / Serial crystal experiment: N |
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放射光源 | 由来: ![]() ![]() ![]() |
検出器 | タイプ: DECTRIS EIGER R 4M / 検出器: PIXEL / 日付: 2022年5月15日 |
放射 | プロトコル: SINGLE WAVELENGTH / 単色(M)・ラウエ(L): M / 散乱光タイプ: x-ray |
放射波長 | 波長: 1.052 Å / 相対比: 1 |
反射 | 解像度: 2.6→44.58 Å / Num. obs: 303548 / % possible obs: 99.94 % / 冗長度: 10 % / Biso Wilson estimate: 56.11 Å2 / CC1/2: 0.998 / Rmerge(I) obs: 0.108 / Rpim(I) all: 0.035 / Net I/σ(I): 17.95 |
反射 シェル | 解像度: 2.6→2.693 Å / 冗長度: 10 % / Rmerge(I) obs: 1.054 / Num. unique obs: 30201 / CC1/2: 0.771 / Rpim(I) all: 0.3489 / % possible all: 99.97 |
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解析
ソフトウェア |
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精密化 | 構造決定の手法: ![]() 立体化学のターゲット値: GeoStd + Monomer Library + CDL v1.2
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溶媒の処理 | 減衰半径: 0.9 Å / VDWプローブ半径: 1.1 Å / 溶媒モデル: FLAT BULK SOLVENT MODEL | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
原子変位パラメータ | Biso mean: 58.76 Å2 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
精密化ステップ | サイクル: LAST / 解像度: 2.6→44.58 Å
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拘束条件 |
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LS精密化 シェル |
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