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- PDB-1v6i: Peanut lectin-lactose complex in acidic pH -

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Basic information

Entry
Database: PDB / ID: 1v6i
TitlePeanut lectin-lactose complex in acidic pH
ComponentsGalactose-binding lectin
KeywordsSUGAR BINDING PROTEIN / Lectin / open quaternary association / lactose / orthorhombic / carbohydrate specificity / protein crystallography / agglutinin
Function / homology
Function and homology information


carbohydrate binding / metal ion binding
Similarity search - Function
Legume lectin / Legume lectin, alpha chain, conserved site / Legume lectins alpha-chain signature. / Legume lectins beta-chain signature. / Legume lectin domain / Legume lectin, beta chain, Mn/Ca-binding site / Legume lectin domain / Jelly Rolls - #200 / Concanavalin A-like lectin/glucanase domain superfamily / Jelly Rolls ...Legume lectin / Legume lectin, alpha chain, conserved site / Legume lectins alpha-chain signature. / Legume lectins beta-chain signature. / Legume lectin domain / Legume lectin, beta chain, Mn/Ca-binding site / Legume lectin domain / Jelly Rolls - #200 / Concanavalin A-like lectin/glucanase domain superfamily / Jelly Rolls / Sandwich / Mainly Beta
Similarity search - Domain/homology
alpha-lactose / : / Galactose-binding lectin
Similarity search - Component
Biological speciesArachis hypogaea (peanut)
MethodX-RAY DIFFRACTION / Isomorphous replacement / Resolution: 2.15 Å
AuthorsKundhavai Natchiar, S. / Arockia Jeyaprakash, A. / Ramya, T.N.C. / Thomas, C.J. / Suguna, K. / Surolia, A. / Vijayan, M.
Citation
Journal: Acta Crystallogr.,Sect.D / Year: 2004
Title: Structural plasticity of peanut lectin: an X-ray analysis involving variation in pH, ligand binding and crystal structure.
Authors: Kundhavai Natchiar, S. / Arockia Jeyaprakash, A. / Ramya, T.N. / Thomas, C.J. / Suguna, K. / Surolia, A. / Vijayan, M.
#1: Journal: J.Mol.Biol. / Year: 1996
Title: Conformation, protein-carbohydrate interactions and a novel subunit association in the refined structure of peanut lectin-lactose complex
Authors: Banerjee, R. / Das, K. / Ravishankar, R. / Suguna, K. / Surolia, A. / Vijayan, M.
#2: Journal: PROTEINS: STRUCT.,FUNCT.,GENET. / Year: 2001
Title: Crystal structures of the peanut lectin-lactose complex at acidic pH: retention of unusual quaternary structure, empty and carbohydrate bound combining sites, molecular mimicry and crystal ...Title: Crystal structures of the peanut lectin-lactose complex at acidic pH: retention of unusual quaternary structure, empty and carbohydrate bound combining sites, molecular mimicry and crystal packing directed by interactions at the combining site
Authors: Ravishankar, R. / Thomas, C.J. / Suguna, K. / Surolia, A. / Vijayan, M.
History
DepositionDec 1, 2003Deposition site: PDBJ / Processing site: PDBJ
Revision 1.0Feb 10, 2004Provider: repository / Type: Initial release
Revision 1.1Apr 27, 2008Group: Version format compliance
Revision 1.2Jul 13, 2011Group: Version format compliance
Revision 2.0Jul 29, 2020Group: Atomic model / Data collection ...Atomic model / Data collection / Derived calculations / 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 / pdbx_struct_conn_angle / 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.name / _chem_comp.type / _pdbx_struct_assembly_gen.asym_id_list / _pdbx_struct_conn_angle.ptnr1_auth_comp_id / _pdbx_struct_conn_angle.ptnr1_auth_seq_id / _pdbx_struct_conn_angle.ptnr1_label_asym_id / _pdbx_struct_conn_angle.ptnr1_label_atom_id / _pdbx_struct_conn_angle.ptnr1_label_comp_id / _pdbx_struct_conn_angle.ptnr1_label_seq_id / _pdbx_struct_conn_angle.ptnr2_auth_comp_id / _pdbx_struct_conn_angle.ptnr2_auth_seq_id / _pdbx_struct_conn_angle.ptnr2_label_asym_id / _pdbx_struct_conn_angle.ptnr2_label_atom_id / _pdbx_struct_conn_angle.ptnr2_label_comp_id / _pdbx_struct_conn_angle.ptnr3_auth_comp_id / _pdbx_struct_conn_angle.ptnr3_auth_seq_id / _pdbx_struct_conn_angle.ptnr3_label_asym_id / _pdbx_struct_conn_angle.ptnr3_label_atom_id / _pdbx_struct_conn_angle.ptnr3_label_comp_id / _pdbx_struct_conn_angle.ptnr3_label_seq_id / _pdbx_struct_conn_angle.value / _struct_conn.pdbx_dist_value / _struct_conn.pdbx_leaving_atom_flag / _struct_conn.ptnr1_auth_asym_id / _struct_conn.ptnr1_auth_comp_id / _struct_conn.ptnr1_auth_seq_id / _struct_conn.ptnr1_label_asym_id / _struct_conn.ptnr1_label_atom_id / _struct_conn.ptnr1_label_comp_id / _struct_conn.ptnr1_label_seq_id / _struct_conn.ptnr2_auth_asym_id / _struct_conn.ptnr2_auth_comp_id / _struct_conn.ptnr2_auth_seq_id / _struct_conn.ptnr2_label_asym_id / _struct_conn.ptnr2_label_atom_id / _struct_conn.ptnr2_label_comp_id / _struct_conn.ptnr2_label_seq_id
Description: Carbohydrate remediation / Provider: repository / Type: Remediation
Revision 2.1Oct 25, 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

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
A: Galactose-binding lectin
B: Galactose-binding lectin
C: Galactose-binding lectin
D: Galactose-binding lectin
hetero molecules


Theoretical massNumber of molelcules
Total (without water)100,57516
Polymers98,8264
Non-polymers1,74912
Water7,620423
1


  • Idetical with deposited unit
  • defined by author
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1
Unit cell
Length a, b, c (Å)128.609, 125.749, 76.049
Angle α, β, γ (deg.)90.00, 90.00, 90.00
Int Tables number18
Space group name H-MP21212

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Components

#1: Protein
Galactose-binding lectin / Agglutinin / PNA


Mass: 24706.385 Da / Num. of mol.: 4 / Source method: isolated from a natural source / Source: (natural) Arachis hypogaea (peanut) / Tissue: seed / References: UniProt: P02872
#2: Polysaccharide
beta-D-galactopyranose-(1-4)-alpha-D-glucopyranose / alpha-lactose


Type: oligosaccharide, Oligosaccharide / Class: Nutrient / Mass: 342.297 Da / Num. of mol.: 4
Source method: isolated from a genetically manipulated source
Details: oligosaccharide / References: alpha-lactose
DescriptorTypeProgram
DGalpb1-4DGlcpa1-ROHGlycam Condensed SequenceGMML 1.0
WURCS=2.0/2,2,1/[a2122h-1a_1-5][a2112h-1b_1-5]/1-2/a4-b1WURCSPDB2Glycan 1.1.0
[][a-D-Glcp]{[(4+1)][b-D-Galp]{}}LINUCSPDB-CARE
#3: Chemical
ChemComp-CA / CALCIUM ION


Mass: 40.078 Da / Num. of mol.: 4 / Source method: obtained synthetically / Formula: Ca
#4: Chemical
ChemComp-MN / MANGANESE (II) ION


Mass: 54.938 Da / Num. of mol.: 4 / Source method: obtained synthetically / Formula: Mn
#5: Water ChemComp-HOH / water / Water


Mass: 18.015 Da / Num. of mol.: 423 / 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: 3.1 Å3/Da / Density % sol: 60.06 %
Crystal growTemperature: 293 K / Method: hanging drop method / pH: 4.6
Details: PEG 8000, 0.2M calcium acetate, 0.1M cacodylate pH 6.5, pH 4.6, hanging drop method, temperature 293K
Crystal grow
*PLUS
Method: vapor diffusion, hanging drop
Components of the solutions
*PLUS
IDConc.Common nameCrystal-IDSol-IDChemical formula
14.2 mg/mlprotein1drop
20.05 Msodium acetate1drop
30.2 M1dropNaCl
40.05 %sodium azide1drop
52.1 mMlactose1drop
612 %PEG80001reservoir

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Data collection

DiffractionMean temperature: 293 K
Diffraction sourceSource: ROTATING ANODE / Type: RIGAKU RU200 / Wavelength: 1.5418 Å
DetectorType: MARRESEARCH / Detector: IMAGE PLATE / Details: Mirror
RadiationProtocol: SINGLE WAVELENGTH / Monochromatic (M) / Laue (L): M / Scattering type: x-ray
Radiation wavelengthWavelength: 1.5418 Å / Relative weight: 1
ReflectionResolution: 2.15→20 Å / Num. all: 67860 / Num. obs: 67601 / Redundancy: 5.8 % / Biso Wilson estimate: 27.7 Å2 / Rmerge(I) obs: 0.131
Reflection shellResolution: 2.15→2.17 Å / Redundancy: 5.6 % / Rmerge(I) obs: 0.575 / Num. unique all: 3325
Reflection
*PLUS
% possible obs: 99.9 % / Num. measured all: 391685
Reflection shell
*PLUS
% possible obs: 100 % / Num. unique obs: 3325 / Num. measured obs: 18544

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Processing

Software
NameVersionClassification
CNS1.1refinement
DENZOdata reduction
SCALEPACKdata scaling
RefinementMethod to determine structure: Isomorphous replacement
Starting model: 2PEL

2pel


Resolution: 2.15→20 Å / Rfactor Rfree error: 0.004 / Data cutoff high absF: 213348.39 / Data cutoff low absF: 0 / Cross valid method: THROUGHOUT / σ(F): 0
RfactorNum. reflection% reflectionSelection details
Rfree0.218 2639 4.1 %RANDOM
Rwork0.184 ---
obs-64350 99.9 %-
Solvent computationSolvent model: FLAT MODEL / Bsol: 52.6673 Å2 / ksol: 0.343806 e/Å3
Displacement parametersBiso mean: 27.7 Å2
Baniso -1Baniso -2Baniso -3
1-4.79 Å20 Å20 Å2
2---3.58 Å20 Å2
3----1.21 Å2
Refine analyze
FreeObs
Luzzati coordinate error0.28 Å0.23 Å
Luzzati d res low-5 Å
Luzzati sigma a0.27 Å0.22 Å
Refinement stepCycle: LAST / Resolution: 2.15→20 Å
ProteinNucleic acidLigandSolventTotal
Num. atoms6976 0 100 423 7499
Refine LS restraints
Refine-IDTypeDev idealDev ideal target
X-RAY DIFFRACTIONc_bond_d0.005
X-RAY DIFFRACTIONc_angle_deg1.4
X-RAY DIFFRACTIONc_dihedral_angle_d26.4
X-RAY DIFFRACTIONc_improper_angle_d0.85
X-RAY DIFFRACTIONc_mcbond_it1.391.5
X-RAY DIFFRACTIONc_mcangle_it2.212
X-RAY DIFFRACTIONc_scbond_it2.062
X-RAY DIFFRACTIONc_scangle_it2.982.5
LS refinement shellResolution: 2.15→2.28 Å / Rfactor Rfree error: 0.014 / Total num. of bins used: 6
RfactorNum. reflection% reflection
Rfree0.283 439 4.4 %
Rwork0.232 9613 -
obs--90.4 %
Xplor file
Refine-IDSerial noParam file
X-RAY DIFFRACTION1PROTEIN_REP.PARAM
X-RAY DIFFRACTION2ION.PARAM
X-RAY DIFFRACTION3WATER_REP.PARAM
X-RAY DIFFRACTION4CARBOHYDRATE.PARAM
X-RAY DIFFRACTION5CIS1.PARAM
Refinement
*PLUS
Lowest resolution: 20 Å
Solvent computation
*PLUS
Displacement parameters
*PLUS
Refine LS restraints
*PLUS
Refine-IDTypeDev ideal
X-RAY DIFFRACTIONc_dihedral_angle_d
X-RAY DIFFRACTIONc_dihedral_angle_deg26.4
X-RAY DIFFRACTIONc_improper_angle_d
X-RAY DIFFRACTIONc_improper_angle_deg0.85

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