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- PDB-1iex: Crystal structure of barley beta-D-glucan glucohydrolase isoenzym... -

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Basic information

Entry
Database: PDB / ID: 1iex
TitleCrystal structure of barley beta-D-glucan glucohydrolase isoenzyme Exo1 in complex with 4I,4III,4V-S-trithiocellohexaose
ComponentsBETA-D-GLUCAN GLUCOHYDROLASE ISOENZYME EXO1
KeywordsHYDROLASE / 2-domain fold
Function / homology
Function and homology information


hydrolase activity, hydrolyzing O-glycosyl compounds / carbohydrate metabolic process
Similarity search - Function
: / Glycoside hydrolase family 3 C-terminal domain / Glycoside hydrolase, family 3, N-terminal domain / Glycoside hydrolase family 3 C-terminal domain / Glycosyl hydrolase family 3 C-terminal domain / Glycoside hydrolase family 3 C-terminal domain superfamily / Glycoside hydrolase, family 3, N-terminal / Glycoside hydrolase, family 3, N-terminal domain superfamily / Glycosyl hydrolase family 3 N terminal domain / Glycoside hydrolase superfamily ...: / Glycoside hydrolase family 3 C-terminal domain / Glycoside hydrolase, family 3, N-terminal domain / Glycoside hydrolase family 3 C-terminal domain / Glycosyl hydrolase family 3 C-terminal domain / Glycoside hydrolase family 3 C-terminal domain superfamily / Glycoside hydrolase, family 3, N-terminal / Glycoside hydrolase, family 3, N-terminal domain superfamily / Glycosyl hydrolase family 3 N terminal domain / Glycoside hydrolase superfamily / TIM Barrel / Alpha-Beta Barrel / Rossmann fold / 3-Layer(aba) Sandwich / Alpha Beta
Similarity search - Domain/homology
thio-beta-cellobiose / : / Beta-D-glucan exohydrolase isoenzyme ExoI
Similarity search - Component
Biological speciesHordeum vulgare (barley)
MethodX-RAY DIFFRACTION / SYNCHROTRON / MOLECULAR REPLACEMENT / Resolution: 2.2 Å
AuthorsHrmova, M. / DeGori, R. / Fincher, G.B. / Smith, B.J. / Driguez, H. / Varghese, J.N.
CitationJournal: Structure / Year: 2001
Title: Catalytic mechanisms and reaction intermediates along the hydrolytic pathway of a plant beta-D-glucan glucohydrolase.
Authors: Hrmova, M. / Varghese, J.N. / De Gori, R. / Smith, B.J. / Driguez, H. / Fincher, G.B.
History
DepositionApr 11, 2001Deposition site: RCSB / Processing site: RCSB
Revision 1.0Nov 14, 2001Provider: repository / Type: Initial release
Revision 1.1Apr 27, 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 / Non-polymer description / Structure summary
Category: atom_site / chem_comp ...atom_site / chem_comp / entity / entity_name_com / 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_molecule_features / 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.formula / _chem_comp.formula_weight / _chem_comp.id / _chem_comp.mon_nstd_flag / _chem_comp.name / _chem_comp.type / _pdbx_struct_assembly_gen.asym_id_list
Description: Carbohydrate remediation / Provider: repository / Type: Remediation
Revision 2.1Aug 16, 2023Group: Data collection / Database references ...Data collection / Database references / Refinement description / Structure summary
Category: chem_comp / chem_comp_atom ...chem_comp / chem_comp_atom / chem_comp_bond / database_2 / pdbx_initial_refinement_model
Item: _chem_comp.pdbx_synonyms / _database_2.pdbx_DOI / _database_2.pdbx_database_accession
Revision 2.2Nov 20, 2024Group: Structure summary / Category: pdbx_entry_details / pdbx_modification_feature
Remark 600HETEROGEN The ligand 4I,4III,4V-S-trithiocellohexaose is present in the crystal. Only the ...HETEROGEN The ligand 4I,4III,4V-S-trithiocellohexaose is present in the crystal. Only the thiocellobiose portion of the ligand is seen in the density; the 4III,4V-S-thiocellotetraose moiety is disordered and can not be seen.
Remark 999SEQUENCE The sequence in the GenBank entry might be a sequencing error at residue 345. The electron ...SEQUENCE The sequence in the GenBank entry might be a sequencing error at residue 345. The electron density unambiguously proved the presence of LYS instead of ASN at this residue.

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
A: BETA-D-GLUCAN GLUCOHYDROLASE ISOENZYME EXO1
hetero molecules


Theoretical massNumber of molelcules
Total (without water)67,1534
Polymers65,4761
Non-polymers1,6783
Water5,423301
1


  • Idetical with deposited unit
  • defined by author
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1
Unit cell
Length a, b, c (Å)102.420, 102.420, 185.480
Angle α, β, γ (deg.)90.00, 90.00, 90.00
Int Tables number96
Space group name H-MP43212
DetailsThe biological assembly is a monomer constructed from an (alpha/beta)8 barrel and an (alpha/beta)6 sandwich.

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Components

#1: Protein BETA-D-GLUCAN GLUCOHYDROLASE ISOENZYME EXO1 / BETA-D-GLUCAN EXOHYDROLASE ISOENZYME EXOI


Mass: 65475.617 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Hordeum vulgare (barley) / Strain: CULTIVAR CLIPPER
References: GenBank: 4566505, UniProt: Q9XEI3*PLUS, glucan 1,3-beta-glucosidase
#2: Polysaccharide 2-acetamido-2-deoxy-beta-D-glucopyranose-(1-2)-alpha-D-mannopyranose-(1-6)-beta-D-mannopyranose-(1- ...2-acetamido-2-deoxy-beta-D-glucopyranose-(1-2)-alpha-D-mannopyranose-(1-6)-beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-[alpha-L-fucopyranose-(1-3)]2-acetamido-2-deoxy-beta-D-glucopyranose


Type: oligosaccharide / Mass: 1098.016 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
DescriptorTypeProgram
DGlcpNAcb1-2DManpa1-6DManpb1-4DGlcpNAcb1-4[LFucpa1-3]DGlcpNAcb1-Glycam Condensed SequenceGMML 1.0
WURCS=2.0/4,6,5/[a2122h-1b_1-5_2*NCC/3=O][a1221m-1a_1-5][a1122h-1b_1-5][a1122h-1a_1-5]/1-2-1-3-4-1/a3-b1_a4-c1_c4-d1_d6-e1_e2-f1WURCSPDB2Glycan 1.1.0
[]{[(4+1)][b-D-GlcpNAc]{[(3+1)][a-L-Fucp]{}[(4+1)][b-D-GlcpNAc]{[(4+1)][b-D-Manp]{[(6+1)][a-D-Manp]{[(2+1)][b-D-GlcpNAc]{}}}}}}LINUCSPDB-CARE
#3: Polysaccharide beta-D-glucopyranose-(1-4)-4-thio-beta-D-glucopyranose / thio-beta-cellobiose


Type: oligosaccharide, Oligosaccharide / Class: Substrate analog / Mass: 358.362 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Details: oligosaccharide with S-glycosidic bond between monosaccharides
References: thio-beta-cellobiose
DescriptorTypeProgram
WURCS=2.0/1,2,1/[a2122h-1b_1-5]/1-1/a4-b1*S*WURCSPDB2Glycan 1.1.0
[][b-D-Glcp4SH]{[(4+S)][b-D-Glcp]{}}LINUCSPDB-CARE
#4: Sugar ChemComp-NAG / 2-acetamido-2-deoxy-beta-D-glucopyranose / N-acetyl-beta-D-glucosamine / 2-acetamido-2-deoxy-beta-D-glucose / 2-acetamido-2-deoxy-D-glucose / 2-acetamido-2-deoxy-glucose / N-ACETYL-D-GLUCOSAMINE


Type: D-saccharide, beta linking / Mass: 221.208 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Formula: C8H15NO6
IdentifierTypeProgram
DGlcpNAcbCONDENSED IUPAC CARBOHYDRATE SYMBOLGMML 1.0
N-acetyl-b-D-glucopyranosamineCOMMON NAMEGMML 1.0
b-D-GlcpNAcIUPAC CARBOHYDRATE SYMBOLPDB-CARE 1.0
GlcNAcSNFG CARBOHYDRATE SYMBOLGMML 1.0
#5: Water ChemComp-HOH / water


Mass: 18.015 Da / Num. of mol.: 301 / Source method: isolated from a natural source / Formula: H2O
Has protein modificationY

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Experimental details

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Experiment

ExperimentMethod: X-RAY DIFFRACTION / Number of used crystals: 3

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Sample preparation

CrystalDensity Matthews: 3.71 Å3/Da / Density % sol: 66.87 %
Crystal growTemperature: 277 K / Method: vapor diffusion, hanging drop / pH: 7
Details: ammonium sulfate, PEG 400, sodium acetate, Hepes-NaOH, pH 7.0, VAPOR DIFFUSION, HANGING DROP, temperature 277K
Crystal grow
*PLUS
Temperature: 277-279 K / Details: Hrmova, M., (1998) Acta Cryst., D54, 687.
Components of the solutions
*PLUS
IDConc.Common nameCrystal-IDSol-ID
16.8 mg/mlenzyme1drop
275 mMHEPES-NaOH1drop
37.5 mMsodium acetate1drop
41.2 %(w/v)PEG4001drop
50.8 Mammonium sulfate1drop
61.7 Mammonium sulfate1reservoir
750 mMHEPES-NaOH1reservoir

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Data collection

DiffractionMean temperature: 255 K
Diffraction sourceSource: SYNCHROTRON / Site: Photon Factory / Beamline: BL-6A / Wavelength: 1 Å
DetectorType: WEISSENBERG / Detector: DIFFRACTOMETER / Date: Mar 1, 1998 / Details: Collimator
RadiationProtocol: SINGLE WAVELENGTH / Monochromatic (M) / Laue (L): M / Scattering type: x-ray
Radiation wavelengthWavelength: 1 Å / Relative weight: 1
ReflectionResolution: 2.2→20 Å / Num. all: 123698 / Num. obs: 46444 / % possible obs: 83.4 % / Observed criterion σ(F): 0 / Observed criterion σ(I): 0 / Redundancy: 4.4 % / Rmerge(I) obs: 0.098 / Net I/σ(I): 15.8
Reflection shellResolution: 2.2→20 Å / Rmerge(I) obs: 0.486 / % possible all: 55.8
Reflection
*PLUS
Redundancy: 4.4 % / Num. measured all: 123698

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Processing

Software
NameClassification
DENZOdata reduction
SCALEPACKdata scaling
CNSrefinement
CNSphasing
RefinementMethod to determine structure: MOLECULAR REPLACEMENT
Starting model: PDB ENTRY 1EX1

1ex1


Resolution: 2.2→12 Å / Isotropic thermal model: Isotropic / Cross valid method: THROUGHOUT / σ(F): 0 / σ(I): 0 / Stereochemistry target values: Engh & Huber
RfactorNum. reflectionSelection details
Rfree0.211 4163 Random
Rwork0.178 --
all-41299 -
obs-37136 -
Refine analyzeLuzzati coordinate error obs: 0.24 Å
Refinement stepCycle: LAST / Resolution: 2.2→12 Å
ProteinNucleic acidLigandSolventTotal
Num. atoms4575 0 111 301 4987
Refine LS restraints
Refine-IDTypeDev ideal
X-RAY DIFFRACTIONc_bond_d0.01
X-RAY DIFFRACTIONc_angle_deg1.3
Software
*PLUS
Name: CNS / Classification: refinement
Refinement
*PLUS
Highest resolution: 2.2 Å / Lowest resolution: 12 Å / σ(F): 0 / Rfactor obs: 0.1776 / Rfactor Rfree: 0.2109
Solvent computation
*PLUS
Displacement parameters
*PLUS
Refine LS restraints
*PLUS
Refine-IDTypeDev ideal
X-RAY DIFFRACTIONc_bond_d0.01
X-RAY DIFFRACTIONc_angle_deg1.3

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