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- EMDB-25835: CryoEM Structure of sFab COP-3 Complex with human claudin-4 and C... -
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Open data
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Basic information
Entry | Database: EMDB / ID: EMD-25835 | |||||||||
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Title | CryoEM Structure of sFab COP-3 Complex with human claudin-4 and Clostridium perfringens enterotoxin C-terminal domain | |||||||||
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Function / homology | ![]() positive regulation of metallopeptidase activity / calcium-independent cell-cell adhesion via plasma membrane cell-adhesion molecules / Tight junction interactions / bicellular tight junction assembly / apicolateral plasma membrane / regulation of cell morphogenesis / ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() Similarity search - Function | |||||||||
Biological species | ![]() ![]() ![]() ![]() ![]() | |||||||||
Method | ![]() ![]() | |||||||||
![]() | Vecchio AJ / Orlando BJ | |||||||||
Funding support | ![]()
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![]() | ![]() Title: Development, structure, and mechanism of synthetic antibodies that target claudin and Clostridium perfringens enterotoxin complexes. Authors: Benjamin J Orlando / Pawel K Dominik / Sourav Roy / Chinemerem P Ogbu / Satchal K Erramilli / Anthony A Kossiakoff / Alex J Vecchio / ![]() Abstract: Strains of Clostridium perfringens produce a two-domain enterotoxin (CpE) that afflicts humans and domesticated animals, causing prevalent gastrointestinal illnesses. CpE's C-terminal domain (cCpE) ...Strains of Clostridium perfringens produce a two-domain enterotoxin (CpE) that afflicts humans and domesticated animals, causing prevalent gastrointestinal illnesses. CpE's C-terminal domain (cCpE) binds cell surface receptors, followed by a restructuring of its N-terminal domain to form a membrane-penetrating β-barrel pore, which is toxic to epithelial cells of the gut. The claudin family of membrane proteins are known receptors for CpE and also control the architecture and function of cell-cell contacts (tight junctions) that create barriers to intercellular molecular transport. CpE binding and assembly disables claudin barrier function and induces cytotoxicity via β-pore formation, disrupting gut homeostasis; however, a structural basis of this process and strategies to inhibit the claudin-CpE interactions that trigger it are both lacking. Here, we used a synthetic antigen-binding fragment (sFab) library to discover two sFabs that bind claudin-4 and cCpE complexes. We established these sFabs' mode of molecular recognition and binding properties and determined structures of each sFab bound to claudin-4-cCpE complexes using cryo-EM. The structures reveal that the sFabs bind a shared epitope, but conform distinctly, which explains their unique binding equilibria. Mutagenesis of antigen/sFab interfaces observed therein result in binding changes, validating the structures, and uncovering the sFab's targeting mechanism. From these insights, we generated a model for CpE's claudin-bound β-pore that predicted sFabs would not prevent cytotoxicity, which we then verified in vivo. Taken together, this work demonstrates the development and mechanism of claudin/cCpE-binding sFabs that provide a framework and strategy for obstructing claudin/CpE assembly to treat CpE-linked gastrointestinal diseases. | |||||||||
History |
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Structure visualization
Movie |
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Structure viewer | EM map: ![]() ![]() ![]() |
Supplemental images |
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Downloads & links
-EMDB archive
Map data | ![]() | 115.8 MB | ![]() | |
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Header (meta data) | ![]() ![]() | 20.4 KB 20.4 KB | Display Display | ![]() |
FSC (resolution estimation) | ![]() | 14.8 KB | Display | ![]() |
Images | ![]() | 41.7 KB | ||
Filedesc metadata | ![]() | 6.3 KB | ||
Others | ![]() ![]() | 116 MB 116 MB | ||
Archive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 7tdnMC ![]() 7tdmC M: atomic model generated by this map C: citing same article ( |
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Similar structure data |
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Links
EMDB pages | ![]() ![]() |
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Related items in Molecule of the Month |
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Map
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Voxel size | X=Y=Z: 0.871 Å | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Density |
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Symmetry | Space group: 1 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Details | EMDB XML:
CCP4 map header:
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-Supplemental data
-Half map: #2
File | emd_25835_half_map_1.map | ||||||||||||
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Projections & Slices |
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Density Histograms |
-Half map: #1
File | emd_25835_half_map_2.map | ||||||||||||
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Projections & Slices |
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Density Histograms |
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Sample components
-Entire : Human claudin-4/cCpE/COP-3 Complex
Entire | Name: Human claudin-4/cCpE/COP-3 Complex |
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Components |
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-Supramolecule #1: Human claudin-4/cCpE/COP-3 Complex
Supramolecule | Name: Human claudin-4/cCpE/COP-3 Complex / type: complex / ID: 1 / Parent: 0 / Macromolecule list: all Details: COP-3 sFab fragment bound to Claudin-4/cCpE complex |
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Molecular weight | Theoretical: 85 kDa/nm |
-Macromolecule #1: Claudin-4
Macromolecule | Name: Claudin-4 / type: protein_or_peptide / ID: 1 / Number of copies: 1 / Enantiomer: LEVO |
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Source (natural) | Organism: ![]() ![]() |
Molecular weight | Theoretical: 22.090201 KDa |
Recombinant expression | Organism: ![]() ![]() |
Sequence | String: MASMGLQVMG IALAVLGWLA VMLCCALPMW RVTAFIGSNI VTSQTIWEGL WMNCVVQSTG QMQCKVYDSL LALPQDLQAA RALVIISII VAALGVLLSV VGGKCTNCLE DESAKAKTMI VAGVVFLLAG LMVIVPVSWT AHNIIQDFYN PLVASGQKRE M GASLYVGW ...String: MASMGLQVMG IALAVLGWLA VMLCCALPMW RVTAFIGSNI VTSQTIWEGL WMNCVVQSTG QMQCKVYDSL LALPQDLQAA RALVIISII VAALGVLLSV VGGKCTNCLE DESAKAKTMI VAGVVFLLAG LMVIVPVSWT AHNIIQDFYN PLVASGQKRE M GASLYVGW AASGLLLLGG GLLCCNCPPR TDKPYSAKYS AARSAAASNY V UniProtKB: ![]() |
-Macromolecule #2: Heat-labile enterotoxin B chain
Macromolecule | Name: Heat-labile enterotoxin B chain / type: protein_or_peptide / ID: 2 / Number of copies: 1 / Enantiomer: LEVO |
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Source (natural) | Organism: ![]() ![]() ![]() |
Molecular weight | Theoretical: 15.114945 KDa |
Recombinant expression | Organism: ![]() ![]() |
Sequence | String: MSTDIEKEIL DLAAATERLN LTDALNSNPA GNLYDWRSSN SYPWTQKLNL HLTITATGQK YRILASKIVD FNIYSNNFNN LVKLEQSLG DGVKDHYVDI SLDAGQYVLV MKANSSYSGN YPYSILFQKF GLVPR UniProtKB: Heat-labile enterotoxin B chain |
-Macromolecule #3: COP-3 Fab Heavy chain
Macromolecule | Name: COP-3 Fab Heavy chain / type: protein_or_peptide / ID: 3 / Number of copies: 1 / Enantiomer: LEVO |
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Source (natural) | Organism: ![]() ![]() |
Molecular weight | Theoretical: 25.286066 KDa |
Recombinant expression | Organism: ![]() ![]() ![]() |
Sequence | String: EISEVQLVES GGGLVQPGGS LRLSCAASGF NFYSSSIHWV RQAPGKGLEW VAYISSYSGY TYYADSVKGR FTISADTSKN TAYLQMNSL RAEDTAVYYC ARGYGYFDYN FSVGYALDYW GQGTLVTVSS ASTKGPSVFP LAPSSKSTSG GTAALGCLVK D YFPEPVTV ...String: EISEVQLVES GGGLVQPGGS LRLSCAASGF NFYSSSIHWV RQAPGKGLEW VAYISSYSGY TYYADSVKGR FTISADTSKN TAYLQMNSL RAEDTAVYYC ARGYGYFDYN FSVGYALDYW GQGTLVTVSS ASTKGPSVFP LAPSSKSTSG GTAALGCLVK D YFPEPVTV SWNSGALTSG VHTFPAVLQS SGLYSLSSVV TVPSSSLGTQ TYICNVNHKP SNTKVDKKVE PKSCDKTHT |
-Macromolecule #4: COP-3 Fab Light chain
Macromolecule | Name: COP-3 Fab Light chain / type: protein_or_peptide / ID: 4 / Number of copies: 1 / Enantiomer: LEVO |
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Source (natural) | Organism: ![]() ![]() |
Molecular weight | Theoretical: 23.729328 KDa |
Recombinant expression | Organism: ![]() ![]() ![]() |
Sequence | String: SDIQMTQSPS SLSASVGDRV TITCRASQSV SSAVAWYQQK PGKAPKLLIY SASSLYSGVP SRFSGSRSGT DFTLTISSLQ PEDFATYYC QQSHPWYYPI TFGQGTKVEI KRTVAAPSVF IFPPSDSQLK SGTASVVCLL NNFYPREAKV QWKVDNALQS G NSQESVTE ...String: SDIQMTQSPS SLSASVGDRV TITCRASQSV SSAVAWYQQK PGKAPKLLIY SASSLYSGVP SRFSGSRSGT DFTLTISSLQ PEDFATYYC QQSHPWYYPI TFGQGTKVEI KRTVAAPSVF IFPPSDSQLK SGTASVVCLL NNFYPREAKV QWKVDNALQS G NSQESVTE QDSKDSTYSL SSTLTLSKAD YEKHKVYACE VTHQGLSSPV TKSFNRGEC |
-Experimental details
-Structure determination
Method | ![]() |
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Aggregation state | particle |
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Sample preparation
Concentration | 6.0 mg/mL |
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Buffer | pH: 7.4 |
Grid | Model: Quantifoil R1.2/1.3 / Mesh: 200 / Pretreatment - Type: GLOW DISCHARGE / Pretreatment - Time: 45 sec. / Pretreatment - Pressure: 0.001 kPa |
Vitrification | Cryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 277 K / Instrument: FEI VITROBOT MARK IV |
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Electron microscopy
Microscope | FEI TALOS ARCTICA |
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Electron beam | Acceleration voltage: 200 kV / Electron source: ![]() |
Electron optics | Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD![]() |
Image recording | Film or detector model: FEI FALCON III (4k x 4k) / Detector mode: COUNTING / Number grids imaged: 1 / Number real images: 3758631 / Average electron dose: 39.6 e/Å2 |
Experimental equipment | ![]() Model: Talos Arctica / Image courtesy: FEI Company |
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Image processing
-Atomic model buiding 1
Initial model |
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Refinement | Space: REAL / Protocol: FLEXIBLE FIT / Overall B value: 413.26 | ||||||||||
Output model | ![]() PDB-7tdn: |