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- PDB-3chf: Crystal structure of Aspergillus fumigatus chitinase B1 in comple... -

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Basic information

Entry
Database: PDB / ID: 3chf
TitleCrystal structure of Aspergillus fumigatus chitinase B1 in complex with tetrapeptide
Components
  • Argifin
  • Chitinase
KeywordsHYDROLASE/HYDROLASE INHIBITOR / (beta-alpha)8 barrel / chitinase / peptide inhibitors / Glycosidase / HYDROLASE-HYDROLASE INHIBITOR complex
Function / homology
Function and homology information


endochitinase activity / chitinase / chitin catabolic process / chitin binding / polysaccharide catabolic process / extracellular region
Similarity search - Function
Chitinase A; domain 3 - #10 / Glycosyl hydrolases family 18 (GH18) active site / Glycosyl hydrolases family 18 (GH18) active site signature. / : / Chitinase insertion domain superfamily / Chitinase II / Glyco_18 / Glycosyl hydrolases family 18 / Glycosyl hydrolases family 18 (GH18) domain profile. / Glycoside hydrolase family 18, catalytic domain ...Chitinase A; domain 3 - #10 / Glycosyl hydrolases family 18 (GH18) active site / Glycosyl hydrolases family 18 (GH18) active site signature. / : / Chitinase insertion domain superfamily / Chitinase II / Glyco_18 / Glycosyl hydrolases family 18 / Glycosyl hydrolases family 18 (GH18) domain profile. / Glycoside hydrolase family 18, catalytic domain / Chitinase A; domain 3 / Glycosidases / Glycoside hydrolase superfamily / TIM Barrel / Alpha-Beta Barrel / Roll / Alpha Beta
Similarity search - Domain/homology
Biological speciesAspergillus fumigatus (mold)
MethodX-RAY DIFFRACTION / SYNCHROTRON / Known phases / Resolution: 1.95 Å
AuthorsAndersen, O.A. / van Aalten, D.M.F.
CitationJournal: Chem.Biol. / Year: 2008
Title: Structure-based dissection of the natural product cyclopentapeptide chitinase inhibitor argifin.
Authors: Andersen, O.A. / Nathubhai, A. / Dixon, M.J. / Eggleston, I.M. / van Aalten, D.M.
History
DepositionMar 9, 2008Deposition site: RCSB / Processing site: RCSB
Revision 1.0Mar 25, 2008Provider: repository / Type: Initial release
Revision 1.1Jul 13, 2011Group: Atomic model / Database references ...Atomic model / Database references / Derived calculations / Non-polymer description / Structure summary / Version format compliance
Revision 1.2Aug 30, 2023Group: Data collection / Database references ...Data collection / Database references / Derived calculations / Refinement description
Category: chem_comp_atom / chem_comp_bond ...chem_comp_atom / chem_comp_bond / database_2 / pdbx_initial_refinement_model / struct_conn / struct_site
Item: _database_2.pdbx_DOI / _database_2.pdbx_database_accession ..._database_2.pdbx_DOI / _database_2.pdbx_database_accession / _struct_conn.pdbx_leaving_atom_flag / _struct_site.pdbx_auth_asym_id / _struct_site.pdbx_auth_comp_id / _struct_site.pdbx_auth_seq_id

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

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Assembly

Deposited unit
A: Chitinase
B: Chitinase
C: Argifin
D: Argifin
hetero molecules


Theoretical massNumber of molelcules
Total (without water)97,87818
Polymers96,5334
Non-polymers1,34514
Water15,169842
1
A: Chitinase
C: Argifin
hetero molecules


Theoretical massNumber of molelcules
Total (without water)48,8438
Polymers48,2662
Non-polymers5766
Water362
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1
2
B: Chitinase
D: Argifin
hetero molecules


Theoretical massNumber of molelcules
Total (without water)49,03510
Polymers48,2662
Non-polymers7698
Water362
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1
Unit cell
Length a, b, c (Å)117.060, 117.060, 99.748
Angle α, β, γ (deg.)90.00, 90.00, 90.00
Int Tables number76
Space group name H-MP41

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Components

#1: Protein Chitinase / Class V chitinase ChiB1


Mass: 47661.836 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Aspergillus fumigatus (mold) / Gene: chiB1 / Plasmid: pLysS / Production host: Escherichia coli BL21(DE3) (bacteria) / Strain (production host): BL21(DE3) / References: UniProt: Q873X9, chitinase
#2: Protein/peptide Argifin


Mass: 604.656 Da / Num. of mol.: 2 / Source method: obtained synthetically
#3: Chemical
ChemComp-SO4 / SULFATE ION


Mass: 96.063 Da / Num. of mol.: 14 / Source method: obtained synthetically / Formula: SO4
#4: Water ChemComp-HOH / water


Mass: 18.015 Da / Num. of mol.: 842 / 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: 3.58 Å3/Da / Density % sol: 65.69 %
Crystal growTemperature: 293 K / Method: vapor diffusion, hanging drop / pH: 9.5
Details: Tris/HCl, Li2SO4, pH 9.5, VAPOR DIFFUSION, HANGING DROP, temperature 293K

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Data collection

DiffractionMean temperature: 173 K
Diffraction sourceSource: SYNCHROTRON / Site: ESRF / Beamline: ID14-2 / Wavelength: 0.933 Å
DetectorType: ADSC QUANTUM 4 / Detector: CCD / Date: Feb 18, 2006
RadiationMonochromator: mirrors / Protocol: SINGLE WAVELENGTH / Monochromatic (M) / Laue (L): M / Scattering type: x-ray
Radiation wavelengthWavelength: 0.933 Å / Relative weight: 1
ReflectionResolution: 1.95→20 Å / Num. all: 98052 / Num. obs: 95975 / % possible obs: 98 % / Observed criterion σ(F): 0 / Observed criterion σ(I): 0 / Redundancy: 3.7 % / Biso Wilson estimate: 24.3 Å2 / Rmerge(I) obs: 0.092 / Net I/σ(I): 17.2
Reflection shellResolution: 1.95→2.02 Å / Redundancy: 3.2 % / Rmerge(I) obs: 0.427 / Mean I/σ(I) obs: 2.5 / Num. unique all: 9051 / % possible all: 92.7

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Processing

Software
NameVersionClassification
ADSCQuantumdata collection
PHASESfrom pdb entry 1W9Pphasing
CNS1refinement
DENZOdata reduction
SCALEPACKdata scaling
RefinementMethod to determine structure: Known phases
Starting model: PDB entry 1W9V

1w9v


Resolution: 1.95→20 Å / Isotropic thermal model: Isotropic / Cross valid method: THROUGHOUT / σ(F): 0 / σ(I): 0 / Stereochemistry target values: Engh & Huber
RfactorNum. reflection% reflectionSelection details
Rfree0.197 970 -Random
Rwork0.176 ---
all0.176 97829 --
obs0.176 95895 98 %-
Displacement parametersBiso mean: 26.1 Å2
Refine analyze
FreeObs
Luzzati coordinate error0.23 Å0.2 Å
Luzzati d res low-5 Å
Luzzati sigma a0.19 Å0.17 Å
Refinement stepCycle: LAST / Resolution: 1.95→20 Å
ProteinNucleic acidLigandSolventTotal
Num. atoms6228 0 70 842 7140
Refine LS restraints
Refine-IDTypeDev ideal
X-RAY DIFFRACTIONc_bond_d0.011
X-RAY DIFFRACTIONc_angle_deg1.53
X-RAY DIFFRACTIONc_dihedral_angle_d23.7
X-RAY DIFFRACTIONc_improper_angle_d0.98
LS refinement shellResolution: 1.95→1.99 Å
RfactorNum. reflection
Rfree0.253 57
Rwork0.246 -
obs-4702

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