- EMDB-19111: CryoEM structure of mouse GARP-lTGFbeta1 in complex with a Fab fr... -
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Entry
Database: EMDB / ID: EMD-19111
Title
CryoEM structure of mouse GARP-lTGFbeta1 in complex with a Fab fragment derived from an activating antibody.
Map data
Main map: Sharpened map of mouse GARP-lTGFbeta1 in complex with Fab LMT-12, used for model refinement. Additional map: DeepEMhancer sharpened map, used for model building and map visualization.
Sample
Complex: mouse GAPR-lTGFbeta1 in complex with Fab LMT-12.
Protein or peptide: Transforming growth factor beta activator LRRC32
Protein or peptide: mFab LMT-12, Light Chain
Protein or peptide: mFab LMT-12, Heavy Chain
Protein or peptide: Transforming growth factor beta-1 proprotein
Fonds National de la Recherche Scientifique (FNRS)
PDR / T.0145.21
Belgium
Fonds National de la Recherche Scientifique (FNRS)
WELBIO / CR2019A-02R
Belgium
Other private
Salus Sanguinis
Citation
Journal: Cell Rep / Year: 2025 Title: Antibody-mediated TGF-β1 activation for the treatment of diseases caused by deleterious T cell activity. Authors: Fanny Lambert / Jan Felix / Séverine Wautier / Emilie Dupré / Mathieu Jamez / Camille Michiels / Mélanie Gaignage / Lore Mariën / Manon Lesage / Bas van der Woning / Savvas N Savvides / Sophie Lucas / Abstract: Transforming growth factor β1 (TGF-β1) is an immunosuppressive cytokine produced as a latent homodimer, in which mature TGF-β1 is encapsulated and kept inactive by the latency-associated peptide ...Transforming growth factor β1 (TGF-β1) is an immunosuppressive cytokine produced as a latent homodimer, in which mature TGF-β1 is encapsulated and kept inactive by the latency-associated peptide (LAP). The transmembrane protein GARP presents latent TGF-β1 on the surface of regulatory T cells (Tregs) to enable activation and release of mature TGF-β1 by integrins. Here, we derived monoclonal antibodies (mAbs) that activate latent TGF-β1 anchored on cells by a transmembrane protein. Biochemical and structural studies by electron cryo-microscopy (cryo-EM) reveal that such mAb-mediated activation requires bivalent binding close to the LAP dimerization interface and crosslinking of two membrane-bound GARP:TGF-β1 complexes on the same cell or across different cells. Administration of mAbs to mice with graft versus host disease reduced disease severity and increased survival. The therapeutic effect required Tregs. Collectively, our findings demonstrate that activation of membrane-bound TGF-β1 in vivo is achievable with mAbs, introducing new immunotherapeutic options for allo- or autoimmune diseases characterized by deleterious T cell activity insufficiently controlled by Tregs.
Download / File: emd_19111.map.gz / Format: CCP4 / Size: 325 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Annotation
Main map: Sharpened map of mouse GARP-lTGFbeta1 in complex with Fab LMT-12, used for model refinement. Additional map: DeepEMhancer sharpened map, used for model building and map visualization.
Model: Quantifoil R0.6/1 / Material: GOLD / Mesh: 300 / Support film - Material: GRAPHENE / Support film - topology: CONTINUOUS / Support film - Film thickness: 1 Details: Grids were acquired via PUXANO (https://puxano.com)
Vitrification
Cryogen name: ETHANE
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Electron microscopy
Microscope
JEOL CRYO ARM 300
Image recording
Film or detector model: GATAN K3 (6k x 4k) / Number grids imaged: 1 / Number real images: 13898 / Average exposure time: 3.37 sec. / Average electron dose: 61.8 e/Å2 Details: A total of 6605 untilted movies were collected followed by 3508 movies at 20 degree tilt.
Electron beam
Acceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
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