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- PDB-2xfr: Crystal structure of barley beta-amylase at atomic resolution -

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Basic information

Entry
Database: PDB / ID: 2xfr
TitleCrystal structure of barley beta-amylase at atomic resolution
ComponentsBETA-AMYLASE
KeywordsHYDROLASE / CARBOHYDRATE METABOLISM / GLYCOSYL HYDROLASE FAMILY 14 / STARCH DEGRADATION / GERMINATION
Function / homology
Function and homology information


amylopectin maltohydrolase activity / beta-amylase / beta-amylase activity / polysaccharide catabolic process / identical protein binding
Similarity search - Function
Glycoside hydrolase, family 14B, plant / Beta-amylase active site 2. / Glycoside hydrolase, family 14 / Glycoside hydrolase, family 14, conserved site / Glycosyl hydrolase family 14 / Beta-amylase active site 1. / Glycosidases / Glycoside hydrolase superfamily / TIM Barrel / Alpha-Beta Barrel / Alpha Beta
Similarity search - Domain/homology
Biological speciesHORDEUM VULGARE (barley)
MethodX-RAY DIFFRACTION / SYNCHROTRON / MOLECULAR REPLACEMENT / Resolution: 0.97 Å
AuthorsRejzek, M. / Stevenson, C.E.M. / Southard, A.M. / Stanley, D. / Denyer, K. / Smith, A.M. / Naldrett, M.J. / Lawson, D.M. / Field, R.A.
CitationJournal: Mol.Biosyst. / Year: 2011
Title: Chemical Genetics and Cereal Starch Metabolism: Structural Basis of the Non-Covalent and Covalent Inhibition of Barley Beta-Amylase.
Authors: Rejzek, M. / Stevenson, C.E.M. / Southard, A.M. / Stanley, D. / Denyer, K. / Smith, A.M. / Naldrett, M.J. / Lawson, D.M. / Field, R.A.
History
DepositionMay 28, 2010Deposition site: PDBE / Processing site: PDBE
Revision 1.0Dec 1, 2010Provider: repository / Type: Initial release
Revision 1.1Jan 11, 2012Group: Database references / Refinement description / Version format compliance
Revision 1.2May 8, 2019Group: Data collection / Experimental preparation / Other
Category: database_PDB_rev / database_PDB_rev_record ...database_PDB_rev / database_PDB_rev_record / exptl_crystal_grow / pdbx_database_proc / pdbx_database_status
Item: _exptl_crystal_grow.method / _pdbx_database_status.recvd_author_approval
Revision 1.3May 22, 2019Group: Data collection / Experimental preparation / Category: exptl_crystal_grow / Item: _exptl_crystal_grow.temp
Remark 700 DETERMINATION METHOD: DSSP THE SHEETS PRESENTED AS "AA" IN EACH CHAIN ON SHEET RECORDS BELOW IS ... DETERMINATION METHOD: DSSP THE SHEETS PRESENTED AS "AA" IN EACH CHAIN ON SHEET RECORDS BELOW IS ACTUALLY AN 8-STRANDED BARREL THIS IS REPRESENTED BY A 9-STRANDED SHEET IN WHICH THE FIRST AND LAST STRANDS ARE IDENTICAL.

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

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Assembly

Deposited unit
A: BETA-AMYLASE
hetero molecules


Theoretical massNumber of molelcules
Total (without water)59,7943
Polymers59,6701
Non-polymers1242
Water17,078948
1


  • Idetical with deposited unit
  • defined by author&software
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1
MethodPISA
Unit cell
Length a, b, c (Å)68.830, 71.338, 92.659
Angle α, β, γ (deg.)90.00, 90.00, 90.00
Int Tables number19
Space group name H-MP212121

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Components

#1: Protein BETA-AMYLASE / / 1 / 4-ALPHA-D-GLUCAN MALTOHYDROLASE


Mass: 59670.102 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Details: PROTEIN PURCHASED FROM MEGAZYME / Source: (natural) HORDEUM VULGARE (barley) / Tissue: GRAIN ENDOSPERM / References: UniProt: P16098, beta-amylase
#2: Chemical ChemComp-EDO / 1,2-ETHANEDIOL / ETHYLENE GLYCOL / Ethylene glycol


Mass: 62.068 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: C2H6O2
#3: Water ChemComp-HOH / water / Water


Mass: 18.015 Da / Num. of mol.: 948 / Source method: isolated from a natural source / Formula: H2O
Nonpolymer details1,2-ETHANEDIOL (EDO): PRESENT AT 20 PERCENT IN THE CRYOPROTECTANT
Sequence detailsPROTEIN ISOLATED FROM NATURAL SOURCE BUT SEQUENCE DIFFERS AT 3 POSITIONS TO UNIPROTKB DATABASE ...PROTEIN ISOLATED FROM NATURAL SOURCE BUT SEQUENCE DIFFERS AT 3 POSITIONS TO UNIPROTKB DATABASE ENTRY P16098. THESE CHANGES WERE IDENTIFIED FROM ELECTRON DENSITY MAPS.

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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: 1.91 Å3/Da / Density % sol: 35.6 % / Description: NONE
Crystal growTemperature: 291 K / Method: vapor diffusion, hanging drop / pH: 5.5
Details: CRYSTALS WERE GROWN AT 291 K USING THE HANGING DROP VAPOUR DIFFUSION METHOD WITH PROTEIN AT 10 MG PER ML AND A PRECIPITANT COMPRISED OF 14 PERCENT PEG 3350 IN 100 MM BIS-TRIS PROPANE BUFFER AT PH 5.5

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Data collection

DiffractionMean temperature: 100 K
Diffraction sourceSource: SYNCHROTRON / Site: Diamond / Beamline: I02 / Wavelength: 0.9507
DetectorType: ADSC CCD / Detector: CCD / Date: Mar 8, 2008
RadiationProtocol: SINGLE WAVELENGTH / Monochromatic (M) / Laue (L): M / Scattering type: x-ray
Radiation wavelengthWavelength: 0.9507 Å / Relative weight: 1
ReflectionResolution: 0.95→49.53 Å / Num. obs: 253864 / % possible obs: 94.6 % / Observed criterion σ(I): -9 / Redundancy: 5.28 % / Biso Wilson estimate: 7.1 Å2 / Rmerge(I) obs: 0.1 / Net I/σ(I): 2.32
Reflection shellResolution: 0.97→1.02 Å / Redundancy: 2.09 % / Rmerge(I) obs: 0.39 / Mean I/σ(I) obs: 1.72 / % possible all: 65.6

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Processing

Software
NameVersionClassification
REFMAC5.5.0091refinement
MOSFLMdata reduction
SCALAdata scaling
AMoREphasing
RefinementMethod to determine structure: MOLECULAR REPLACEMENT
Starting model: PDB ENTRY 1B1Y
Resolution: 0.97→38.855 Å / Cor.coef. Fo:Fc: 0.984 / Cor.coef. Fo:Fc free: 0.979 / SU B: 0.421 / SU ML: 0.01 / Cross valid method: THROUGHOUT / σ(F): 0 / ESU R: 0.019 / ESU R Free: 0.019 / Stereochemistry target values: MAXIMUM LIKELIHOOD / Details: HYDROGENS HAVE BEEN ADDED IN THE RIDING POSITIONS.
RfactorNum. reflection% reflectionSelection details
Rfree0.1304 12779 5.07 %RANDOM
Rwork0.113 ---
obs0.114 253710 94.515 %-
Solvent computationIon probe radii: 0.8 Å / Shrinkage radii: 0.8 Å / VDW probe radii: 1.4 Å / Solvent model: MASK BULK SOLVENT
Displacement parametersBiso mean: 8.6 Å2
Baniso -1Baniso -2Baniso -3
1-0.325 Å20 Å20 Å2
2--0.078 Å20 Å2
3----0.403 Å2
Refinement stepCycle: LAST / Resolution: 0.97→38.855 Å
ProteinNucleic acidLigandSolventTotal
Num. atoms3894 0 8 948 4850
Refine LS restraints
Refine-IDTypeDev idealDev ideal targetNumber
X-RAY DIFFRACTIONr_bond_refined_d0.0140.0224429
X-RAY DIFFRACTIONr_bond_other_d
X-RAY DIFFRACTIONr_angle_refined_deg1.5651.9496082
X-RAY DIFFRACTIONr_angle_other_deg
X-RAY DIFFRACTIONr_dihedral_angle_1_deg5.9995594
X-RAY DIFFRACTIONr_dihedral_angle_2_deg36.11523.863233
X-RAY DIFFRACTIONr_dihedral_angle_3_deg11.68915756
X-RAY DIFFRACTIONr_dihedral_angle_4_deg14.4321534
X-RAY DIFFRACTIONr_chiral_restr0.0950.2620
X-RAY DIFFRACTIONr_gen_planes_refined0.010.0215129
X-RAY DIFFRACTIONr_gen_planes_other
X-RAY DIFFRACTIONr_nbd_refined
X-RAY DIFFRACTIONr_nbd_other
X-RAY DIFFRACTIONr_nbtor_refined
X-RAY DIFFRACTIONr_nbtor_other
X-RAY DIFFRACTIONr_xyhbond_nbd_refined
X-RAY DIFFRACTIONr_xyhbond_nbd_other
X-RAY DIFFRACTIONr_metal_ion_refined
X-RAY DIFFRACTIONr_metal_ion_other
X-RAY DIFFRACTIONr_symmetry_vdw_refined
X-RAY DIFFRACTIONr_symmetry_vdw_other0.240.246
X-RAY DIFFRACTIONr_symmetry_hbond_refined
X-RAY DIFFRACTIONr_symmetry_hbond_other
X-RAY DIFFRACTIONr_symmetry_metal_ion_refined
X-RAY DIFFRACTIONr_symmetry_metal_ion_other
X-RAY DIFFRACTIONr_mcbond_it2.5491.52634
X-RAY DIFFRACTIONr_mcbond_other1.3621.51052
X-RAY DIFFRACTIONr_mcangle_it3.74224300
X-RAY DIFFRACTIONr_mcangle_other
X-RAY DIFFRACTIONr_scbond_it5.15931795
X-RAY DIFFRACTIONr_scbond_other
X-RAY DIFFRACTIONr_scangle_it6.6154.51736
X-RAY DIFFRACTIONr_scangle_other
X-RAY DIFFRACTIONr_long_range_B_refined
X-RAY DIFFRACTIONr_long_range_B_other
X-RAY DIFFRACTIONr_rigid_bond_restr2.64737525
X-RAY DIFFRACTIONr_sphericity_free19.1683948
X-RAY DIFFRACTIONr_sphericity_bonded6.72537356
LS refinement shellResolution: 0.97→0.995 Å / Total num. of bins used: 20
RfactorNum. reflection% reflection
Rfree0.459 516 -
Rwork0.442 10016 -
obs--53.489 %

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