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- PDB-2f6b: Structural and active site modification studies implicate Glu, Tr... -

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Basic information

Entry
Database: PDB / ID: 2f6b
TitleStructural and active site modification studies implicate Glu, Trp and Arg in the activity of xylanase from alkalophilic Bacillus sp. (NCL 87-6-10).
ComponentsFamily 11 Xylanase
KeywordsHYDROLASE / Alkaline xylanase / Active site residues / Chemical modification / Three-dimentional structure.
Function / homology
Function and homology information


endo-1,4-beta-xylanase activity / endo-1,4-beta-xylanase / xylan catabolic process
Similarity search - Function
Glycoside hydrolase family 11, active site 2 / Glycosyl hydrolases family 11 (GH11) active site signature 2. / Glycoside hydrolase family 11/12, catalytic domain / Glycoside hydrolase family 11, active site 1 / Glycosyl hydrolases family 11 (GH11) active site signature 1. / Glycoside hydrolase family 11 / Glycosyl hydrolases family 11 (GH11) domain / Glycosyl hydrolases family 11 / Glycosyl hydrolases family 11 (GH11) domain profile. / Glycoside hydrolase family 11/12 ...Glycoside hydrolase family 11, active site 2 / Glycosyl hydrolases family 11 (GH11) active site signature 2. / Glycoside hydrolase family 11/12, catalytic domain / Glycoside hydrolase family 11, active site 1 / Glycosyl hydrolases family 11 (GH11) active site signature 1. / Glycoside hydrolase family 11 / Glycosyl hydrolases family 11 (GH11) domain / Glycosyl hydrolases family 11 / Glycosyl hydrolases family 11 (GH11) domain profile. / Glycoside hydrolase family 11/12 / Concanavalin A-like lectin/glucanase domain superfamily / Jelly Rolls / Sandwich / Mainly Beta
Similarity search - Domain/homology
Endo-1,4-beta-xylanase
Similarity search - Component
Biological speciesBacillus (Bacillus rRNA group 1)
MethodX-RAY DIFFRACTION / MOLECULAR REPLACEMENT / Resolution: 2.8 Å
AuthorsSatyanarayana, L. / Balakrishnan, H. / Gaikward, S. / Suresh, C.G.
CitationJournal: To be Published
Title: Structural and active site modification studies implicate Glu, Trp and Arg in the activity of xylanase from alkalophilic Bacillus sp. (NCL 87-6-10).
Authors: Balakrishnan, H. / Satyanarayana, L. / Gaikward, S. / Suresh, C.G.
History
DepositionNov 29, 2005Deposition site: RCSB / Processing site: RCSB
Revision 1.0Dec 13, 2005Provider: repository / Type: Initial release
Revision 1.1May 1, 2008Group: Version format compliance
Revision 1.2Jul 13, 2011Group: Version format compliance
Revision 1.3Aug 23, 2023Group: Data collection / Database references / Refinement description
Category: chem_comp_atom / chem_comp_bond ...chem_comp_atom / chem_comp_bond / database_2 / pdbx_initial_refinement_model / struct_ncs_dom_lim
Item: _database_2.pdbx_DOI / _database_2.pdbx_database_accession ..._database_2.pdbx_DOI / _database_2.pdbx_database_accession / _struct_ncs_dom_lim.beg_auth_comp_id / _struct_ncs_dom_lim.end_auth_comp_id

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
A: Family 11 Xylanase
B: Family 11 Xylanase


Theoretical massNumber of molelcules
Total (without water)45,9092
Polymers45,9092
Non-polymers00
Water81145
1
A: Family 11 Xylanase


Theoretical massNumber of molelcules
Total (without water)22,9541
Polymers22,9541
Non-polymers00
Water181
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1
2
B: Family 11 Xylanase


Theoretical massNumber of molelcules
Total (without water)22,9541
Polymers22,9541
Non-polymers00
Water181
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1
Unit cell
Length a, b, c (Å)73.421, 77.281, 79.233
Angle α, β, γ (deg.)90.00, 90.00, 90.00
Int Tables number19
Space group name H-MP212121
Noncrystallographic symmetry (NCS)NCS domain:
IDEns-IDDetails
11A
21B

NCS domain segments:

Component-ID: 1 / Ens-ID: 1 / Beg auth comp-ID: ILE / Beg label comp-ID: ILE / End auth comp-ID: LEU / End label comp-ID: LEU / Refine code: 1 / Auth seq-ID: 2 - 206 / Label seq-ID: 2 - 206

Dom-IDAuth asym-IDLabel asym-ID
1AA
2BB
DetailsBiological assembly is one monomer (A of A and B subunits) of asymmetric unit.

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Components

#1: Protein Family 11 Xylanase


Mass: 22954.301 Da / Num. of mol.: 2 / Source method: isolated from a natural source / Details: Soil / Source: (natural) Bacillus (Bacillus rRNA group 1) / Genus: Bacillus / References: UniProt: Q7SIE3*PLUS, endo-1,4-beta-xylanase
#2: Water ChemComp-HOH / water


Mass: 18.015 Da / Num. of mol.: 45 / 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: 2.45 Å3/Da / Density % sol: 49.74 %
Crystal growTemperature: 295 K / Method: vapor diffusion, hanging drop / pH: 6.5
Details: Isopropanal 30%,Sodium citrate 0.2M, Sodium Cacodylate buffer(0.1M) of pH 6.5, VAPOR DIFFUSION, HANGING DROP, temperature 295K

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Data collection

DiffractionMean temperature: 295 K
Diffraction sourceSource: ROTATING ANODE / Type: RIGAKU RU200 / Wavelength: 1.5418 Å
DetectorType: RIGAKU RAXIS IV / Detector: IMAGE PLATE / Date: Dec 12, 2004 / Details: Osmic mirrors
RadiationMonochromator: Osmic MIRRORS / Protocol: SINGLE WAVELENGTH / Monochromatic (M) / Laue (L): M / Scattering type: x-ray
Radiation wavelengthWavelength: 1.5418 Å / Relative weight: 1
ReflectionResolution: 2.8→55 Å / Num. all: 11622 / Num. obs: 11586 / % possible obs: 93.9 % / Observed criterion σ(F): 1 / Observed criterion σ(I): 1 / Redundancy: 4.127 % / Biso Wilson estimate: 48.349 Å2 / Rmerge(I) obs: 0.071 / Net I/σ(I): 12.64
Reflection shellResolution: 2.8→2.9 Å / Redundancy: 4.127 % / Rmerge(I) obs: 0.071 / Mean I/σ(I) obs: 12.64 / Num. unique all: 10868 / % possible all: 93.9

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Processing

Software
NameVersionClassification
REFMAC5.2.1refinement
DENZOdata reduction
SCALEPACKdata scaling
AMoREphasing
RefinementMethod to determine structure: MOLECULAR REPLACEMENT
Starting model: PDB ENTRY 1H4G
Resolution: 2.8→55.05 Å / Cor.coef. Fo:Fc: 0.951 / Cor.coef. Fo:Fc free: 0.91 / SU B: 12.924 / SU ML: 0.252 / Isotropic thermal model: Isotropic / Cross valid method: THROUGHOUT / σ(F): 1 / σ(I): 1 / ESU R Free: 0.372 / Stereochemistry target values: Engh & Huber / Details: Maximum likelihood procedure
RfactorNum. reflection% reflectionSelection details
Rfree0.22649 519 4.8 %RANDOM
Rwork0.16632 ---
all0.17102 ---
obs0.16917 10334 93.72 %-
Solvent computationIon probe radii: 0.8 Å / Shrinkage radii: 0.8 Å / VDW probe radii: 1.4 Å
Displacement parametersBiso mean: 35.209 Å2
Baniso -1Baniso -2Baniso -3
1--0.2 Å20 Å20 Å2
2--4.27 Å20 Å2
3----4.07 Å2
Refinement stepCycle: LAST / Resolution: 2.8→55.05 Å
ProteinNucleic acidLigandSolventTotal
Num. atoms3238 0 0 45 3283
Refine LS restraints
Refine-IDTypeDev idealDev ideal targetNumber
X-RAY DIFFRACTIONr_bond_refined_d0.0190.0213340
X-RAY DIFFRACTIONr_bond_other_d
X-RAY DIFFRACTIONr_angle_refined_deg1.711.9044542
X-RAY DIFFRACTIONr_angle_other_deg
X-RAY DIFFRACTIONr_dihedral_angle_1_deg7.7315410
X-RAY DIFFRACTIONr_dihedral_angle_2_deg
X-RAY DIFFRACTIONr_dihedral_angle_3_deg
X-RAY DIFFRACTIONr_dihedral_angle_4_deg
X-RAY DIFFRACTIONr_chiral_restr0.1120.2468
X-RAY DIFFRACTIONr_gen_planes_refined0.0060.022626
X-RAY DIFFRACTIONr_gen_planes_other
X-RAY DIFFRACTIONr_nbd_refined0.2320.21285
X-RAY DIFFRACTIONr_nbd_other
X-RAY DIFFRACTIONr_nbtor_refined
X-RAY DIFFRACTIONr_nbtor_other
X-RAY DIFFRACTIONr_xyhbond_nbd_refined0.1370.2126
X-RAY DIFFRACTIONr_xyhbond_nbd_other
X-RAY DIFFRACTIONr_metal_ion_refined
X-RAY DIFFRACTIONr_metal_ion_other
X-RAY DIFFRACTIONr_symmetry_vdw_refined0.2880.224
X-RAY DIFFRACTIONr_symmetry_vdw_other
X-RAY DIFFRACTIONr_symmetry_hbond_refined0.1250.27
X-RAY DIFFRACTIONr_symmetry_hbond_other
X-RAY DIFFRACTIONr_symmetry_metal_ion_refined
X-RAY DIFFRACTIONr_symmetry_metal_ion_other
X-RAY DIFFRACTIONr_mcbond_it0.9181.52024
X-RAY DIFFRACTIONr_mcbond_other
X-RAY DIFFRACTIONr_mcangle_it1.57523260
X-RAY DIFFRACTIONr_scbond_it1.95831316
X-RAY DIFFRACTIONr_scangle_it3.3524.51282
X-RAY DIFFRACTIONr_rigid_bond_restr
X-RAY DIFFRACTIONr_sphericity_free
X-RAY DIFFRACTIONr_sphericity_bonded
Refine LS restraints NCS

Dom-ID: 1 / Auth asym-ID: A / Ens-ID: 1 / Number: 1619 / Refine-ID: X-RAY DIFFRACTION

TypeRms dev position (Å)Weight position
tight positional0.10.05
tight thermal0.180.5
LS refinement shellResolution: 2.8→2.9 Å
RfactorNum. reflection% reflection
Rfree0.226 519 -
Rwork0.166 --
obs-1081 93.9 %

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