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- PDB-1x6n: Crystal structure of S. marcescens chitinase A mutant W167A in co... -

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Basic information

Entry
Database: PDB / ID: 1x6n
TitleCrystal structure of S. marcescens chitinase A mutant W167A in complex with allosamidin
ComponentsChitinase A
KeywordsHYDROLASE / Inhibitor complex
Function / homology
Function and homology information


chitinase / chitinase activity / chitin catabolic process / chitin binding / polysaccharide catabolic process
Similarity search - Function
Chitinase A N-terminal / Chitinase A, N-terminal domain / PKD/Chitinase domain / Repeats in polycystic kidney disease 1 (PKD1) and other proteins / 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 ...Chitinase A N-terminal / Chitinase A, N-terminal domain / PKD/Chitinase domain / Repeats in polycystic kidney disease 1 (PKD1) and other proteins / 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 (GH18) domain profile. / Glycosyl hydrolases family 18 / Glycoside hydrolase family 18, catalytic domain / Chitinase A; domain 3 / Glycosidases / Immunoglobulin E-set / Glycoside hydrolase superfamily / Immunoglobulins / TIM Barrel / Roll / Alpha-Beta Barrel / Immunoglobulin-like fold / Immunoglobulin-like / Sandwich / Mainly Beta / Alpha Beta
Similarity search - Domain/homology
Allosamidin / ALLOSAMIZOLINE / Chitinase A
Similarity search - Component
Biological speciesSerratia marcescens (bacteria)
MethodX-RAY DIFFRACTION / SYNCHROTRON / MOLECULAR REPLACEMENT / Resolution: 2 Å
AuthorsAronson Jr., N.N. / Halloran, B.A. / Alexyev, M.F. / Zhou, X.E. / Wang, Y. / Meehan, E.J. / Chen, L.
CitationJournal: To be Published
Title: Muation of Trp167 at the -3 subsite of the chitin-binding cleft of S. marcescens chitinase A causes enhanced transglycosylation
Authors: Aronson Jr., N.N. / Halloran, B.A. / Alexyev, M.F. / Zhou, X.E. / Wang, Y. / Meehan, E.J. / Chen, L.
History
DepositionAug 11, 2004Deposition site: RCSB / Processing site: RCSB
Revision 1.0Jul 26, 2005Provider: repository / Type: Initial release
Revision 1.1Apr 30, 2008Group: Version format compliance
Revision 1.2Jul 13, 2011Group: Version format compliance
Revision 1.3Nov 9, 2016Group: Non-polymer description
Revision 1.4Oct 20, 2021Group: Advisory / Database references / Structure summary
Category: chem_comp / database_2 ...chem_comp / database_2 / pdbx_database_remark / 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 / _pdbx_database_remark.text / _struct_ref_seq_dif.details
Revision 2.0Apr 13, 2022Group: 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 / 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 / pdbx_nonpoly_scheme / pdbx_struct_assembly_gen / struct_asym / struct_conn / struct_conn_type / 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 / _chem_comp.formula / _chem_comp.formula_weight / _chem_comp.id / _chem_comp.mon_nstd_flag / _chem_comp.name / _chem_comp.pdbx_synonyms / _chem_comp.type / _pdbx_entity_nonpoly.comp_id / _pdbx_entity_nonpoly.entity_id / _pdbx_entity_nonpoly.name / _pdbx_nonpoly_scheme.asym_id / _pdbx_nonpoly_scheme.auth_seq_num / _pdbx_nonpoly_scheme.entity_id / _pdbx_nonpoly_scheme.mon_id / _pdbx_nonpoly_scheme.pdb_mon_id / _pdbx_struct_assembly_gen.asym_id_list / _struct_site_gen.auth_seq_id / _struct_site_gen.label_asym_id
Revision 2.1Aug 23, 2023Group: Data collection / Refinement description
Category: chem_comp_atom / chem_comp_bond / pdbx_initial_refinement_model
Revision 2.2Nov 20, 2024Group: Structure summary / Category: pdbx_entry_details / pdbx_modification_feature
Remark 999SEQUENCE THE AUTHORS VERIFIED THE SEQUENCE BY MS AND DNA SEQUENCING.

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
A: Chitinase A
hetero molecules


Theoretical massNumber of molelcules
Total (without water)61,6133
Polymers60,9721
Non-polymers6412
Water3,333185
1


  • Idetical with deposited unit
  • defined by author
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1
Unit cell
Length a, b, c (Å)76.670, 133.070, 192.220
Angle α, β, γ (deg.)90.00, 90.00, 90.00
Int Tables number23
Space group name H-MI222

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Components

#1: Protein Chitinase A


Mass: 60972.434 Da / Num. of mol.: 1 / Mutation: W167A
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Serratia marcescens (bacteria) / Gene: chiA / Plasmid: PET23A / Species (production host): Escherichia coli / Production host: Escherichia coli BL21(DE3) (bacteria) / Strain (production host): BL21(DE3) / References: UniProt: P07254, chitinase
#2: Polysaccharide 2-acetamido-2-deoxy-beta-D-allopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-allopyranose


Type: oligosaccharide, Oligosaccharide / Class: Inhibitor / Mass: 424.401 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
References: Allosamidin
DescriptorTypeProgram
DAllpNAcb1-4DAllpNAcb1-ROHGlycam Condensed SequenceGMML 1.0
WURCS=2.0/1,2,1/[a2222h-1b_1-5_2*NCC/3=O]/1-1/a4-b1WURCSPDB2Glycan 1.1.0
[][D-1-deoxy-AllpNAc]{[(4+1)][b-D-AllpNAc]{}}LINUCSPDB-CARE
#3: Chemical ChemComp-AMI / ALLOSAMIZOLINE


Type: Oligosaccharide / Class: Inhibitor / Mass: 216.234 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: C9H16N2O4 / References: Allosamidin
#4: Water ChemComp-HOH / water


Mass: 18.015 Da / Num. of mol.: 185 / 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: 1

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Sample preparation

CrystalDensity Matthews: 4.02 Å3/Da / Density % sol: 69.41 %
Crystal growTemperature: 298 K / Method: vapor diffusion, hanging drop / pH: 7.3
Details: methanol,Hepes, pH 7.3, VAPOR DIFFUSION, HANGING DROP, temperature 298K

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Data collection

DiffractionMean temperature: 100 K
Diffraction sourceSource: SYNCHROTRON / Site: APS / Beamline: 22-ID / Wavelength: 1 Å
DetectorType: MARRESEARCH / Detector: CCD / Date: Apr 16, 2004 / Details: Mirrors
RadiationMonochromator: Ni filter / Protocol: SINGLE WAVELENGTH / Monochromatic (M) / Laue (L): M / Scattering type: x-ray
Radiation wavelengthWavelength: 1 Å / Relative weight: 1
ReflectionResolution: 2→50 Å / Num. all: 64829 / Num. obs: 64829 / % possible obs: 97.3 % / Observed criterion σ(F): 0 / Observed criterion σ(I): 0 / Redundancy: 6.2 % / Biso Wilson estimate: 21.9 Å2 / Rmerge(I) obs: 0.064 / Rsym value: 0.064 / Net I/σ(I): 12.8
Reflection shellResolution: 2→2.07 Å / Redundancy: 4 % / Rmerge(I) obs: 0.527 / Mean I/σ(I) obs: 1.9 / Num. unique all: 5440 / Rsym value: 0.527 / % possible all: 82.2

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Processing

Software
NameVersionClassification
CNS1refinement
HKL-2000data reduction
SCALEPACKdata scaling
CNSphasing
RefinementMethod to determine structure: MOLECULAR REPLACEMENT
Starting model: pdb entry 1X6L

1x6l


Resolution: 2→19.94 Å / Rfactor Rfree error: 0.005 / Data cutoff high absF: 529978.16 / Data cutoff low absF: 0 / Isotropic thermal model: RESTRAINED / Cross valid method: THROUGHOUT / σ(F): 2 / σ(I): 1 / Stereochemistry target values: Engh & Huber
RfactorNum. reflection% reflectionSelection details
Rfree0.238 2770 5.1 %RANDOM
Rwork0.214 ---
all0.25 64829 --
obs0.214 54333 81.5 %-
Solvent computationSolvent model: FLAT MODEL / Bsol: 43.3633 Å2 / ksol: 0.366975 e/Å3
Displacement parametersBiso mean: 39.7 Å2
Baniso -1Baniso -2Baniso -3
1-7.05 Å20 Å20 Å2
2---7.28 Å20 Å2
3---0.23 Å2
Refine analyze
FreeObs
Luzzati coordinate error0.28 Å0.25 Å
Luzzati d res low-5 Å
Luzzati sigma a0.22 Å0.2 Å
Refinement stepCycle: LAST / Resolution: 2→19.94 Å
ProteinNucleic acidLigandSolventTotal
Num. atoms4119 0 43 185 4347
Refine LS restraints
Refine-IDTypeDev idealDev ideal target
X-RAY DIFFRACTIONc_bond_d0.006
X-RAY DIFFRACTIONc_angle_deg1.4
X-RAY DIFFRACTIONc_dihedral_angle_d24
X-RAY DIFFRACTIONc_improper_angle_d0.84
X-RAY DIFFRACTIONc_mcbond_it1.351.5
X-RAY DIFFRACTIONc_mcangle_it2.052
X-RAY DIFFRACTIONc_scbond_it2.272
X-RAY DIFFRACTIONc_scangle_it3.122.5
LS refinement shellResolution: 2→2.13 Å / Rfactor Rfree error: 0.016 / Total num. of bins used: 6
RfactorNum. reflection% reflection
Rfree0.27 270 5.3 %
Rwork0.257 4781 -
obs-4781 46 %
Xplor file
Refine-IDSerial noParam fileTopol file
X-RAY DIFFRACTION1PROTEIN_REP.PARAMPROTEIN.TOP
X-RAY DIFFRACTION2WATER_REP.PARAMWATER.TOP
X-RAY DIFFRACTION3ALLOS.PARALLOS.TOP

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