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-Structure paper
| タイトル | Structural and mechanistic insights into the constitutive Themis-Grb2 complex in T cell signalling. |
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| ジャーナル・号・ページ | Nat Commun, Vol. 17, Issue 1, Year 2026 |
| 掲載日 | 2026年5月20日 |
著者 | Danielle M Clancy / Alba Sanz-Sanjuan / Elisabeth Gilis / Peter Tougaard / Imke Velghe / Yana Van Droogenbroeck / Jan Felix / Yehudi Bloch / Álvaro Furones Cuadrado / Romain Merceron / Stephan Schenck / Peter Vandenabeele / Janine D Brunner / Tom Taghon / Dirk Elewaut / Savvas N Savvides / ![]() |
| PubMed 要旨 | Thymocyte selection is essential for establishing the T cell repertoire, maintaining self-tolerance and preventing autoimmunity. Themis, the archetypal member of a metazoan protein family defined by ...Thymocyte selection is essential for establishing the T cell repertoire, maintaining self-tolerance and preventing autoimmunity. Themis, the archetypal member of a metazoan protein family defined by CABIT domains, centrally regulates this process by integrating T cell receptor (TCR) signalling. Themis has been proposed to constitutively partner with the multifunctional adaptor Grb2, yet the structural and mechanistic basis of this assembly has remained enigmatic. Here, we use Cryo-EM to reveal how the tandem CABIT domains and proline-rich sequence of Themis cooperatively engulf the C-terminal SH3 domain of Grb2, while the unbound domains of Grb2 remain poised to recruit additional binding partners. Furthermore, we uncover inherent interdomain flexibility in unbound Themis that resolves upon Grb2 binding. Structure-guided mutations abrogate the Themis-Grb2 interaction and fail to regulate the tyrosine phosphatase SHP-1 after TCR stimulation, recapitulating the phenotype of Themis-deficient cells. Our findings define the Themis-Grb2 complex as a dynamic structural hub in T cell signalling. |
リンク | Nat Commun / PubMed:42161968 / PubMed Central |
| 手法 | EM (単粒子) |
| 解像度 | 3.2 - 7.0 Å |
| 構造データ | EMDB-52603, PDB-9i3p: ![]() EMDB-52604: 3D reconstruction of Themis:Grb2:ProMacrobody256 after 3D classification (Class 1) ![]() EMDB-52605: 3D reconstruction of Themis:Grb2:ProMacrobody256 after 3D classification (Class 2) ![]() EMDB-52606: 3D reconstruction of Themis:Grb2:ProMacrobody256 after 3D classification (Class 3) ![]() EMDB-52607: 3D reconstruction of Themis:Grb2:ProMacrobody256 after 3D classification (Class 4) ![]() EMDB-52608: CryoEM map of Themis bound to ProMacrobody 256 ![]() EMDB-52609: 3D reconstruction of Themis:ProMacrobody256 after 3D classification (Class 1) ![]() EMDB-52610: 3D reconstruction of Themis:ProMacrobody256 after 3D classification (Class 2) EMDB-52787, PDB-9iaz: |
| 由来 |
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キーワード | SIGNALING PROTEIN / adapter protein / CABIT / TCR / T cell development |
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homo sapiens (ヒト)
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