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- PDB-2g7c: Clostridium difficile Toxin A Fragment Bound to aGal(1,3)bGal(1,4... -

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Basic information

Entry
Database: PDB / ID: 2g7c
TitleClostridium difficile Toxin A Fragment Bound to aGal(1,3)bGal(1,4)bGlcNAc
ComponentsToxin A
KeywordsTOXIN / Linear B trisaccharide / protein-carbohydrate complex / bacterial toxin
Function / homology
Function and homology information


Transferases; Glycosyltransferases; Hexosyltransferases / host cell cytosol / glycosyltransferase activity / 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 ...Transferases; Glycosyltransferases; Hexosyltransferases / host cell cytosol / glycosyltransferase activity / 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 / metal ion binding / membrane
Similarity search - Function
Cholin Binding / left handed beta-beta-3-solenoid / 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 ...Cholin Binding / left handed beta-beta-3-solenoid / 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 / Choline-binding repeat / Putative cell wall binding repeat / Cell wall/choline-binding repeat / Cell wall-binding repeat profile. / Nucleotide-diphospho-sugar transferases / Ribbon / Mainly Beta
Similarity search - Domain/homology
Biological speciesClostridium difficile (bacteria)
MethodX-RAY DIFFRACTION / SYNCHROTRON / MOLECULAR REPLACEMENT / Resolution: 2 Å
AuthorsGreco, A. / Ho, J.G.S. / Lin, S.J. / Palcic, M.M. / Rupnik, M. / Ng, K.K.S.
CitationJournal: Nat.Struct.Mol.Biol. / Year: 2006
Title: Carbohydrate recognition by Clostridium difficile toxin A.
Authors: Greco, A. / Ho, J.G. / Lin, S.J. / Palcic, M.M. / Rupnik, M. / Ng, K.K.
History
DepositionFeb 28, 2006Deposition site: RCSB / Processing site: RCSB
Revision 1.0Apr 18, 2006Provider: repository / Type: Initial release
Revision 1.1May 1, 2008Group: Version format compliance
Revision 1.2Jul 13, 2011Group: Non-polymer description / Version format compliance
Revision 2.0Jul 29, 2020Group: Atomic model / Data collection ...Atomic model / Data collection / Derived calculations / Structure summary
Category: atom_site / chem_comp ...atom_site / chem_comp / entity / pdbx_branch_scheme / pdbx_chem_comp_identifier / pdbx_entity_branch / pdbx_entity_branch_descriptor / pdbx_entity_branch_link / pdbx_entity_branch_list / pdbx_entity_nonpoly / pdbx_nonpoly_scheme / pdbx_struct_assembly_gen / struct_asym / struct_conn / struct_site / struct_site_gen
Item: _atom_site.B_iso_or_equiv / _atom_site.Cartn_x ..._atom_site.B_iso_or_equiv / _atom_site.Cartn_x / _atom_site.Cartn_y / _atom_site.Cartn_z / _atom_site.auth_asym_id / _atom_site.auth_atom_id / _atom_site.auth_comp_id / _atom_site.auth_seq_id / _atom_site.label_asym_id / _atom_site.label_atom_id / _atom_site.label_comp_id / _atom_site.label_entity_id / _atom_site.type_symbol / _chem_comp.name / _chem_comp.type / _pdbx_struct_assembly_gen.asym_id_list / _struct_conn.pdbx_dist_value / _struct_conn.pdbx_leaving_atom_flag / _struct_conn.ptnr1_auth_asym_id / _struct_conn.ptnr1_auth_comp_id / _struct_conn.ptnr1_auth_seq_id / _struct_conn.ptnr1_label_asym_id / _struct_conn.ptnr1_label_atom_id / _struct_conn.ptnr1_label_comp_id / _struct_conn.ptnr2_auth_asym_id / _struct_conn.ptnr2_auth_comp_id / _struct_conn.ptnr2_auth_seq_id / _struct_conn.ptnr2_label_asym_id / _struct_conn.ptnr2_label_atom_id / _struct_conn.ptnr2_label_comp_id
Description: Carbohydrate remediation / Provider: repository / Type: Remediation
Revision 2.1Dec 21, 2022Group: Database references / Structure summary / Category: chem_comp / database_2 / struct_ref_seq_dif
Item: _chem_comp.pdbx_synonyms / _database_2.pdbx_DOI ..._chem_comp.pdbx_synonyms / _database_2.pdbx_DOI / _database_2.pdbx_database_accession / _struct_ref_seq_dif.details
Revision 2.2Sep 20, 2023Group: Data collection / Refinement description
Category: chem_comp_atom / chem_comp_bond / pdbx_initial_refinement_model
Remark 999Sequence The differences between the sequence present in this structure and the sequence in the ...Sequence The differences between the sequence present in this structure and the sequence in the reference database are unique to strain 48489 of Clostridium difficile.

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
A: Toxin A
B: Toxin A
hetero molecules


Theoretical massNumber of molelcules
Total (without water)60,02412
Polymers57,2892
Non-polymers2,73510
Water7,440413
1
A: Toxin A
hetero molecules


Theoretical massNumber of molelcules
Total (without water)30,1047
Polymers28,6451
Non-polymers1,4596
Water181
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1
2
B: Toxin A
hetero molecules


Theoretical massNumber of molelcules
Total (without water)29,9205
Polymers28,6451
Non-polymers1,2754
Water181
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1
Unit cell
Length a, b, c (Å)38.682, 132.825, 65.917
Angle α, β, γ (deg.)90.00, 100.29, 90.00
Int Tables number4
Space group name H-MP1211

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Components

#1: Protein Toxin A


Mass: 28644.740 Da / Num. of mol.: 2 / Fragment: TcdA fragment 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Clostridium difficile (bacteria) / Strain: 48489 / Gene: toxA, tcdA / Plasmid: pET-3a / Production host: Escherichia coli (E. coli) / Strain (production host): BL21(DE3)pLysS / References: UniProt: P16154
#2: Polysaccharide
alpha-D-galactopyranose-(1-3)-beta-D-galactopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose


Type: oligosaccharide / Mass: 545.490 Da / Num. of mol.: 4
Source method: isolated from a genetically manipulated source
DescriptorTypeProgram
DGalpa1-3DGalpb1-4DGlcpNAcb1-ROHGlycam Condensed SequenceGMML 1.0
WURCS=2.0/3,3,2/[a2122h-1b_1-5_2*NCC/3=O][a2112h-1b_1-5][a2112h-1a_1-5]/1-2-3/a4-b1_b3-c1WURCSPDB2Glycan 1.1.0
[][b-D-GlcpNAc]{[(4+1)][b-D-Galp]{[(3+1)][a-D-Galp]{}}}LINUCSPDB-CARE
#3: Chemical
ChemComp-GOL / GLYCEROL / GLYCERIN / PROPANE-1,2,3-TRIOL


Mass: 92.094 Da / Num. of mol.: 6 / Source method: obtained synthetically / Formula: C3H8O3
#4: Water ChemComp-HOH / water


Mass: 18.015 Da / Num. of mol.: 413 / Source method: isolated from a natural source / Formula: H2O

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Experimental details

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Experiment

ExperimentMethod: X-RAY DIFFRACTION / Number of used crystals: 1

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Sample preparation

CrystalDensity Matthews: 2.91 Å3/Da / Density % sol: 57.7 %
Crystal growTemperature: 293 K / Method: vapor diffusion, hanging drop / pH: 7
Details: 6% PEG 3350, 0.1 M Bis-Tris-Cl pH 7.0, 5% glycerol, VAPOR DIFFUSION, HANGING DROP, temperature 293K

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Data collection

DiffractionMean temperature: 100 K
Diffraction sourceSource: SYNCHROTRON / Site: ALS / Beamline: 8.3.1 / Wavelength: 1.115 Å
DetectorType: ADSC QUANTUM 315 / Detector: CCD / Date: Aug 25, 2005 / Details: mirrors
RadiationMonochromator: double crystal / Protocol: SINGLE WAVELENGTH / Monochromatic (M) / Laue (L): M / Scattering type: x-ray
Radiation wavelengthWavelength: 1.115 Å / Relative weight: 1
ReflectionResolution: 2→60 Å / Num. all: 44075 / Num. obs: 44075 / % possible obs: 99.9 % / Observed criterion σ(F): -3 / Observed criterion σ(I): -3 / Redundancy: 4 % / Rmerge(I) obs: 0.047 / Rsym value: 0.047 / Net I/σ(I): 27.6
Reflection shellResolution: 2→2.07 Å / Redundancy: 4 % / Rmerge(I) obs: 0.203 / Mean I/σ(I) obs: 7 / Num. unique all: 4692 / Rsym value: 0.203 / % possible all: 99.9

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Processing

Software
NameVersionClassification
DENZOdata reduction
SCALEPACKdata scaling
PHASERphasing
CNS1.1refinement
RefinementMethod to determine structure: MOLECULAR REPLACEMENT
Starting model: PDB Entry 2F6E

2f6e


Resolution: 2→60 Å / Isotropic thermal model: Isotropic / Cross valid method: THROUGHOUT / σ(F): 0 / σ(I): 0 / Stereochemistry target values: Engh & Huber
RfactorNum. reflection% reflectionSelection details
Rfree0.236 2210 -random
Rwork0.195 ---
all0.197 44075 --
obs0.197 44075 99.9 %-
Displacement parameters
Baniso -1Baniso -2Baniso -3
1--1.74 Å20 Å2-0.278 Å2
2--2.765 Å20 Å2
3----1.025 Å2
Refinement stepCycle: LAST / Resolution: 2→60 Å
ProteinNucleic acidLigandSolventTotal
Num. atoms3991 0 184 413 4588
Refine LS restraints
Refine-IDTypeDev ideal
X-RAY DIFFRACTIONc_angle_deg1.38
X-RAY DIFFRACTIONc_bond_d0.0068

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