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- EMDB-20926: Clostridium difficile binary toxin translocase CDTb in asymmetric... -
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Open data
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Basic information
Entry | Database: EMDB / ID: EMD-20926 | |||||||||
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Title | Clostridium difficile binary toxin translocase CDTb in asymmetric tetradecamer conformation | |||||||||
![]() | toxin translocase | |||||||||
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![]() | Translocase / binary toxin / TOXIN | |||||||||
Function / homology | ![]() protein homooligomerization / transferase activity / extracellular region / metal ion binding Similarity search - Function | |||||||||
Biological species | ![]() | |||||||||
Method | single particle reconstruction / cryo EM / Resolution: 2.8 Å | |||||||||
![]() | Xu X / Pozharski E | |||||||||
![]() | ![]() Title: Structure of the cell-binding component of the binary toxin reveals a di-heptamer macromolecular assembly. Authors: Xingjian Xu / Raquel Godoy-Ruiz / Kaylin A Adipietro / Christopher Peralta / Danya Ben-Hail / Kristen M Varney / Mary E Cook / Braden M Roth / Paul T Wilder / Thomas Cleveland / Alexander ...Authors: Xingjian Xu / Raquel Godoy-Ruiz / Kaylin A Adipietro / Christopher Peralta / Danya Ben-Hail / Kristen M Varney / Mary E Cook / Braden M Roth / Paul T Wilder / Thomas Cleveland / Alexander Grishaev / Heather M Neu / Sarah L J Michel / Wenbo Yu / Dorothy Beckett / Richard R Rustandi / Catherine Lancaster / John W Loughney / Adam Kristopeit / Sianny Christanti / Jessica W Olson / Alexander D MacKerell / Amedee des Georges / Edwin Pozharski / David J Weber / ![]() Abstract: Targeting infection is challenging because treatment options are limited, and high recurrence rates are common. One reason for this is that hypervirulent strains often have a binary toxin termed ...Targeting infection is challenging because treatment options are limited, and high recurrence rates are common. One reason for this is that hypervirulent strains often have a binary toxin termed the toxin, in addition to the enterotoxins TsdA and TsdB. The toxin has an enzymatic component, termed CDTa, and a pore-forming or delivery subunit termed CDTb. CDTb was characterized here using a combination of single-particle cryoelectron microscopy, X-ray crystallography, NMR, and other biophysical methods. In the absence of CDTa, 2 di-heptamer structures for activated CDTb (1.0 MDa) were solved at atomic resolution, including a symmetric (CDTb; 3.14 Å) and an asymmetric form (CDTb; 2.84 Å). Roles played by 2 receptor-binding domains of activated CDTb were of particular interest since the receptor-binding domain 1 lacks sequence homology to any other known toxin, and the receptor-binding domain 2 is completely absent in other well-studied heptameric toxins (i.e., anthrax). For CDTb, a Ca binding site was discovered in the first receptor-binding domain that is important for its stability, and the second receptor-binding domain was found to be critical for host cell toxicity and the di-heptamer fold for both forms of activated CDTb. Together, these studies represent a starting point for developing structure-based drug-design strategies to target the most severe strains of . | |||||||||
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 | ![]() | 228 MB | ![]() | |
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Header (meta data) | ![]() ![]() | 11.2 KB 11.2 KB | Display Display | ![]() |
FSC (resolution estimation) | ![]() | 14.1 KB | Display | ![]() |
Images | ![]() | 39.3 KB | ||
Filedesc metadata | ![]() | 5.6 KB | ||
Archive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 6uwrMC ![]() 6uwiC ![]() 6uwoC ![]() 6uwtC 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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Annotation | toxin translocase | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Voxel size | X=Y=Z: 1.06 Å | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Density |
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Symmetry | Space group: 1 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Details | EMDB XML:
CCP4 map header:
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-Supplemental data
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Sample components
-Entire : Tetradecamer of CDTb
Entire | Name: Tetradecamer of CDTb |
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Components |
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-Supramolecule #1: Tetradecamer of CDTb
Supramolecule | Name: Tetradecamer of CDTb / type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1 |
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Source (natural) | Organism: ![]() |
Molecular weight | Theoretical: 1.05 MDa |
-Macromolecule #1: ADP-ribosyltransferase binding component
Macromolecule | Name: ADP-ribosyltransferase binding component / type: protein_or_peptide / ID: 1 / Number of copies: 14 / Enantiomer: LEVO |
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Source (natural) | Organism: ![]() |
Molecular weight | Theoretical: 74.679086 KDa |
Recombinant expression | Organism: ![]() ![]() |
Sequence | String: LMSDWEDEDL DTDNDNIPDS YERNGYTIKD LIAVKWEDSF AEQGYKKYVS NYLESNTAGD PYTDYEKASG SFDKAIKTEA RDPLVAAYP IVGVGMEKLI ISTNEHASTD QGKTVSRATT NSKTESNTAG VSVNVGYQNG FTANVTTNYS HTTDNSTAVQ D SNGESWNT ...String: LMSDWEDEDL DTDNDNIPDS YERNGYTIKD LIAVKWEDSF AEQGYKKYVS NYLESNTAGD PYTDYEKASG SFDKAIKTEA RDPLVAAYP IVGVGMEKLI ISTNEHASTD QGKTVSRATT NSKTESNTAG VSVNVGYQNG FTANVTTNYS HTTDNSTAVQ D SNGESWNT GLSINKGESA YINANVRYYN TGTAPMYKVT PTTNLVLDGD TLSTIKAQEN QIGNNLSPGD TYPKKGLSPL AL NTMDQFS SRLIPINYDQ LKKLDAGKQI KLETTQVSGN FGTKNSSGQI VTEGNSWSDY ISQIDSISAS IILDTENESY ERR VTAKNL QDPEDKTPEL TIGEAIEKAF GATKKDGLLY FNDIPIDESC VELIFDDNTA NKIKDSLKTL SDKKIYNVKL ERGM NILIK TPTYFTNFDD YNNYPSTWSN VNTTNQDGLQ GSANKLNGET KIKIPMSELK PYKRYVFSGY SKDPLTSNSI IVKIK AKEE KTDYLVPEQG YTKFSYEFET TEKDSSNIEI TLIGSGTTYL DNLSITELNS TPEILDEPEV KIPTDQEIMD AHKIYF ADL NFNPSTGNTY INGMYFAPTQ TNKEALDYIQ KYRVEATLQY SGFKDIGTKD KEMRNYLGDP NQPKTNYVNL RSYFTGG EN IMTYKKLRIY AITPDDRELL VLSVD UniProtKB: ADP-ribosyltransferase binding component |
-Macromolecule #2: CALCIUM ION
Macromolecule | Name: CALCIUM ION / type: ligand / ID: 2 / Number of copies: 42 / Formula: CA |
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Molecular weight | Theoretical: 40.078 Da |
-Experimental details
-Structure determination
Method | cryo EM |
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![]() | single particle reconstruction |
Aggregation state | particle |
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Sample preparation
Concentration | 1 mg/mL |
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Buffer | pH: 7.5 |
Vitrification | Cryogen name: ETHANE |
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Electron microscopy
Microscope | FEI TITAN KRIOS |
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Image recording | Film or detector model: GATAN K2 SUMMIT (4k x 4k) / Average electron dose: 56.9 e/Å2 |
Electron beam | Acceleration voltage: 300 kV / Electron source: ![]() |
Electron optics | Illumination mode: SPOT SCAN / Imaging mode: BRIGHT FIELD |
Experimental equipment | ![]() Model: Titan Krios / Image courtesy: FEI Company |
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Image processing
-Atomic model buiding 1
Refinement | Space: REAL / Protocol: BACKBONE TRACE |
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Output model | ![]() PDB-6uwr: |