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- EMDB-39072: TcdB1 in complex with mini-binder -

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Basic information

Entry
Database: EMDB / ID: EMD-39072
TitleTcdB1 in complex with mini-binder
Map data
Sample
  • Complex: De novo design mini-binder in complex with TcdB1
    • Protein or peptide: Toxin B
    • Protein or peptide: De novo design mini-binder
  • Ligand: ZINC ION
KeywordsMini-binder against C.difficle infection / TOXIN-DE NOVO PROTEIN complex
Function / homology
Function and homology information


glucosyltransferase activity / host cell cytosol / Transferases; Glycosyltransferases; Hexosyltransferases / cysteine-type peptidase activity / host cell endosome membrane / toxin activity / Hydrolases; Acting on peptide bonds (peptidases); Cysteine endopeptidases / lipid binding / host cell plasma membrane / proteolysis ...glucosyltransferase activity / host cell cytosol / Transferases; Glycosyltransferases; Hexosyltransferases / cysteine-type peptidase activity / host cell endosome membrane / toxin activity / Hydrolases; Acting on peptide bonds (peptidases); Cysteine endopeptidases / lipid binding / host cell plasma membrane / proteolysis / extracellular region / membrane / metal ion binding
Similarity search - Function
TcdA/TcdB toxin, N-terminal helical domain / TcdB toxin N-terminal helical domain / TcdA/TcdB toxin, catalytic glycosyltransferase domain / TcdA/TcdB catalytic glycosyltransferase domain / TcdA/TcdB toxin, pore forming domain / TcdA/TcdB pore forming domain / CGT/MARTX, cysteine protease (CPD) domain / CGT/MARTX, cysteine protease (CPD) domain superfamily / Peptidase C80 family / CGT/MARTX cysteine protease (CPD) domain profile. ...TcdA/TcdB toxin, N-terminal helical domain / TcdB toxin N-terminal helical domain / TcdA/TcdB toxin, catalytic glycosyltransferase domain / TcdA/TcdB catalytic glycosyltransferase domain / TcdA/TcdB toxin, pore forming domain / TcdA/TcdB pore forming domain / CGT/MARTX, cysteine protease (CPD) domain / CGT/MARTX, cysteine protease (CPD) domain superfamily / Peptidase C80 family / CGT/MARTX cysteine protease (CPD) domain profile. / Choline-binding repeat / Putative cell wall binding repeat / Cell wall/choline-binding repeat / Cell wall-binding repeat profile. / Nucleotide-diphospho-sugar transferases
Similarity search - Domain/homology
Biological speciesClostridioides difficile (bacteria) / synthetic construct (others)
Methodsingle particle reconstruction / cryo EM / Resolution: 3.2 Å
AuthorsLv XC / Lu PL
Funding support China, 2 items
OrganizationGrant numberCountry
Ministry of Science and Technology (MoST, China)2020YFA0909200 China
National Natural Science Foundation of China (NSFC)32301219 China
CitationJournal: Nat Commun / Year: 2024
Title: De novo design of mini-protein binders broadly neutralizing Clostridioides difficile toxin B variants.
Authors: Xinchen Lv / Yuanyuan Zhang / Ke Sun / Qi Yang / Jianhua Luo / Liang Tao / Peilong Lu /
Abstract: Clostridioides difficile toxin B (TcdB) is the key virulence factor accounting for C. difficile infection-associated symptoms. Effectively neutralizing different TcdB variants with a universal ...Clostridioides difficile toxin B (TcdB) is the key virulence factor accounting for C. difficile infection-associated symptoms. Effectively neutralizing different TcdB variants with a universal solution poses a significant challenge. Here we present the de novo design and characterization of pan-specific mini-protein binders against major TcdB subtypes. Our design successfully binds to the first receptor binding interface (RBI-1) of the varied TcdB subtypes, exhibiting affinities ranging from 20 pM to 10 nM. The cryo-electron microscopy (cryo-EM) structures of the mini protein binder in complex with TcdB1 and TcdB4 are consistent with the computational design models. The engineered and evolved variants of the mini-protein binder and chondroitin sulfate proteoglycan 4 (CSPG4), another natural receptor that binds to the second RBI (RBI-2) of TcdB, better neutralize major TcdB variants both in cells and in vivo, as demonstrated by the colon-loop assay using female mice. Our findings provide valuable starting points for the development of therapeutics targeting C. difficile infections (CDI).
History
DepositionFeb 6, 2024-
Header (metadata) releaseAug 28, 2024-
Map releaseAug 28, 2024-
UpdateOct 16, 2024-
Current statusOct 16, 2024Processing site: PDBj / Status: Released

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Structure visualization

Supplemental images

emd_39072.png

Downloads & links

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Map

FileDownload / File: emd_39072.map.gz / Format: CCP4 / Size: 125 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
1.09 Å/pix.
x 320 pix.
= 347.84 Å		1.09 Å/pix.
x 320 pix.
= 347.84 Å		1.09 Å/pix.
x 320 pix.
= 347.84 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 1.087 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.4
Minimum - Maximum-3.6276925 - 5.011236
Average (Standard dev.)-0.00029280002 (±0.108529955)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions320320320
Spacing320320320
CellA=B=C: 347.84 Å
α=β=γ: 90.0 °

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Supplemental data

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Sample components

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Entire : De novo design mini-binder in complex with TcdB1

EntireName: De novo design mini-binder in complex with TcdB1
Components
  • Complex: De novo design mini-binder in complex with TcdB1
    • Protein or peptide: Toxin B
    • Protein or peptide: De novo design mini-binder
  • Ligand: ZINC ION

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Supramolecule #1: De novo design mini-binder in complex with TcdB1

SupramoleculeName: De novo design mini-binder in complex with TcdB1 / type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1-#2
Source (natural)Organism: Clostridioides difficile (bacteria)

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Macromolecule #1: Toxin B

MacromoleculeName: Toxin B / type: protein_or_peptide / ID: 1 / Number of copies: 1 / Enantiomer: LEVO
EC number: Hydrolases; Acting on peptide bonds (peptidases); Cysteine endopeptidases
Source (natural)Organism: Clostridioides difficile (bacteria)
Molecular weightTheoretical: 270.767281 KDa
Recombinant expressionOrganism: Bacillus subtilis (bacteria)
SequenceString: MSLVNRKQLE KMANVRFRTQ EDEYVAILDA LEEYHNMSEN TVVEKYLKLK DINSLTDIYI DTYKKSGRNK ALKKFKEYLV TEVLELKNN NLTPVEKNLH FVWIGGQIND TAINYINQWK DVNSDYNVNV FYDSNAFLIN TLKKTVVESA INDTLESFRE N LNDPRFDY ...String:
MSLVNRKQLE KMANVRFRTQ EDEYVAILDA LEEYHNMSEN TVVEKYLKLK DINSLTDIYI DTYKKSGRNK ALKKFKEYLV TEVLELKNN NLTPVEKNLH FVWIGGQIND TAINYINQWK DVNSDYNVNV FYDSNAFLIN TLKKTVVESA INDTLESFRE N LNDPRFDY NKFFRKRMEI IYDKQKNFIN YYKAQREENP ELIIDDIVKT YLSNEYSKEI DELNTYIEES LNKITQNSGN DV RNFEEFK NGESFNLYEQ ELVERWNLAA ASDILRISAL KEIGGMYLDV DMLPGIQPDL FESIEKPSSV TVDFWEMTKL EAI MKYKEY IPEYTSEHFD MLDEEVQSSF ESVLASKSDK SEIFSSLGDM EASPLEVKIA FNSKGIINQG LISVKDSYCS NLIV KQIEN RYKILNNSLN PAISEDNDFN TTTNTFIDSI MAEANADNGR FMMELGKYLR VGFFPDVKTT INLSGPEAYA AAYQD LLMF KEGSMNIHLI EADLRNFEIS KTNISQSTEQ EMASLWSFDD ARAKAQFEEY KRNYFEGSLG EDDNLDFSQN IVVDKE YLL EKISSLARSS ERGYIHYIVQ LQGDKISYEA ACNLFAKTPY DSVLFQKNIE DSEIAYYYNP GDGEIQEIDK YKIPSII SD RPKIKLTFIG HGKDEFNTDI FAGFDVDSLS TEIEAAIDLA KEDISPKSIE INLLGCNMFS YSINVEETYP GKLLLKVK D KISELMPSIS QDSIIVSANQ YEVRINSEGR RELLDHSGEW INKEESIIKD ISSKEYISFN PKENKITVKS KNLPELSTL LQEIRNNSNS SDIELEEKVM LTECEINVIS NIDTQIVEER IEEAKNLTSD SINYIKDEFK LIESISDALC DLKQQNELED SHFISFEDI SETDEGFSIR FINKETGESI FVETEKTIFS EYANHITEEI SKIKGTIFDT VNGKLVKKVN LDTTHEVNTL N AAFFIQSL IEYNSSKESL SNLSVAMKVQ VYAQLFSTGL NTITDAAKVV ELVSTALDET IDLLPTLSEG LPIIATIIDG VS LGAAIKE LSETSDPLLR QEIEAKIGIM AVNLTTATTA IITSSLGIAS GFSILLVPLA GISAGIPSLV NNELVLRDKA TKV VDYFKH VSLVETEGVF TLLDDKIMMP QDDLVISEID FNNNSIVLGK CEIWRMEGGS GHTVTDDIDH FFSAPSITYR EPHL SIYDV LEVQKEELDL SKDLMVLPNA PNRVFAWETG WTPGLRSLEN DGTKLLDRIR DNYEGEFYWR YFAFIADALI TTLKP RYED TNIRINLDSN TRSFIVPIIT TEYIREKLSY SFYGSGGTYA LSLSQYNMGI NIELSESDVW IIDVDNVVRD VTIESD KIK KGDLIEGILS TLSIEENKII LNSHEINFSG EVNGSNGFVS LTFSILEGIN AIIEVDLLSK SYKLLISGEL KILMLNS NH IQQKIDYIGF NSELQKNIPY SFVDSEGKEN GFINGSTKEG LFVSELPDVV LISKVYMDDS KPSFGYYSNN LKDVKVIT K DNVNILTGYY LKDDIKISLS LTLQDEKTIK LNSVHLDESG VAEILKFMNR KGNTNTSDSL MSFLESMNIK SIFVNFLQS NIKFILDANF IISGTTSIGQ FEFICDENDN IQPYFIKFNT LETNYTLYVG NRQNMIVEPN YDLDDSGDIS STVINFSQKY LYGIDSCVN KVVISPNIYT DEINITPVYE TNNTYPEVIV LDANYINEKI NVNINDLSIR YVWSNDGNDF ILMSTSEENK V SQVKIRFV NVFKDKTLAN KLSFNFSDKQ DVPVSEIILS FTPSYYEDGL IGYDLGLVSL YNEKFYINNF GMMVSGLIYI ND SLYYFKP PVNNLITGFV TVGDDKYYFN PINGGAASIG ETIIDDKNYY FNQSGVLQTG VFSTEDGFKY FAPANTLDEN LEG EAIDFT GKLIIDENIY YFDDNYRGAV EWKELDGEMH YFSPETGKAF KGLNQIGDYK YYFNSDGVMQ KGFVSINDNK HYFD DSGVM KVGYTEIDGK HFYFAENGEM QIGVFNTEDG FKYFAHHNED LGNEEGEEIS YSGILNFNNK IYYFDDSFTA VVGWK DLED GSKYYFDEDT AEAYIGLSLI NDGQYYFNDD GIMQVGFVTI NDKVFYFSDS GIIESGVQNI DDNYFYIDDN GIVQIG VFD TSDGYKYFAP ANTVNDNIYG QAVEYSGLVR VGEDVYYFGE TYTIETGWIY DMENESDKYY FNPETKKACK GINLIDD IK YYFDEKGIMR TGLISFENNN YYFNENGEMQ FGYINIEDKM FYFGEDGVMQ IGVFNTPDGF KYFAHQNTLD ENFEGESI N YTGWLDLDEK RYYFTDEYIA ATGSVIIDGE EYYFDPDTAQ LVISEHHHHH H

UniProtKB: Toxin B

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Macromolecule #2: De novo design mini-binder

MacromoleculeName: De novo design mini-binder / type: protein_or_peptide / ID: 2 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: synthetic construct (others)
Molecular weightTheoretical: 7.43746 KDa
Recombinant expressionOrganism: Escherichia coli BL21(DE3) (bacteria)
SequenceString:
NEEEKFKFFV WFLAIRAGVP EVEVRNDNGK FQVTVKGDTD AARLLTKEVK EVATFLGVDV DLQIR

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Macromolecule #3: ZINC ION

MacromoleculeName: ZINC ION / type: ligand / ID: 3 / Number of copies: 1 / Formula: ZN
Molecular weightTheoretical: 65.409 Da

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Experimental details

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Structure determination

Methodcryo EM
Processingsingle particle reconstruction
Aggregation stateparticle

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Sample preparation

Concentration6 mg/mL
BufferpH: 7
Component:
ConcentrationFormulaName
150.0 mMNaClsodium chloride
20.0 mMTris-HClTrimethylol aminomethane hydrochloride
VitrificationCryogen name: ETHANE

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Electron microscopy

MicroscopeFEI TITAN KRIOS
Image recordingFilm or detector model: GATAN K3 (6k x 4k) / Average electron dose: 50.0 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Nominal defocus max: 2.0 µm / Nominal defocus min: 1.4000000000000001 µm
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

Startup modelType of model: PDB ENTRY
PDB model - PDB ID:

7v1n

Final reconstructionResolution.type: BY AUTHOR / Resolution: 3.2 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 204441
Initial angle assignmentType: ANGULAR RECONSTITUTION
Final angle assignmentType: MAXIMUM LIKELIHOOD
FSC plot (resolution estimation)

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Atomic model buiding 1

Initial model
ChainPDB ID
chain_id: A, source_name: RoseTTAFold, initial_model_type: in silico model
chain_id: B, source_name: PDB, initial_model_type: experimental model

7ml7

RefinementProtocol: AB INITIO MODEL
Output model

PDB-8y9b:
TcdB1 in complex with mini-binder

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