SAXSdb — 1a3y

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1. Protein Identity and Related Structures Protein Identity & Related Structures

ODORANT BINDING PROTEIN

OrganismNot specified

State in the Current Structure

Assembly	Oligomeric State	Construct	Mutations and Modifications	Ligands, Ions and Associated Components	Method and Experimental Conditions	Structure Quality
1	Protein homooligomer Homooligomer Protein × 2 PDB declaration: dimeric（2） Consistent with protein copy count	Chain A； UniProt 9–157 Chain B； UniProt 9–157	Not recorded	No other associated polymer	X-RAY DIFFRACTION X-ray crystallization conditions：pH 5.5；pH 5.5	Resolution 2.25 Å R-free 0.247

Other States of the Same Protein in the Database

Each row is a biological assembly of the same UniProt protein in another PDB entry. The “Difference from current entry” column identifies evidence-level differences; no tag means the currently parsed fields agree.

Other PDB	Difference from Current Entry 1A3Y	Assembly / Oligomeric State	Construct	Mutations and Modifications	Ligands, Ions and Non-polymers	Method and Experimental Conditions	Structure Quality
1DZJ Porcine Odorant Binding Protein Complexed with 2-amino-4-butyl-5-propylselenazole Deposited 2000-03-01	Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric	Chain A 1–157（157 aa）	Not recorded	SES 4-butyl-5-propyl-1,3-selenazol-2-amine × 1	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 7.8；293 K；PROTEIN (0.47MM) IS INCUBATED WITH 10MM OF SELENAZOLE, THE COMPLEX WAS CRYSTALLISED FROM 2M AMMONIUM SULFATE, AND 5% ISOPROPANOL IN HANGING DROPS, AT 20 DEGREES., pH 7.80	Resolution 2.00 Å R-free 0.243
1DZJ Porcine Odorant Binding Protein Complexed with 2-amino-4-butyl-5-propylselenazole Deposited 2000-03-01	Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 2 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric	Chain B 1–157（157 aa）	Not recorded	SES 4-butyl-5-propyl-1,3-selenazol-2-amine × 1	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 7.8；293 K；PROTEIN (0.47MM) IS INCUBATED WITH 10MM OF SELENAZOLE, THE COMPLEX WAS CRYSTALLISED FROM 2M AMMONIUM SULFATE, AND 5% ISOPROPANOL IN HANGING DROPS, AT 20 DEGREES., pH 7.80	Resolution 2.00 Å R-free 0.243
1DZK Porcine Odorant Binding Protein Complexed with pyrazine (2-isobutyl-3-metoxypyrazine) Deposited 2000-03-01	Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric	Chain A 1–157（157 aa）	Not recorded	PRZ 2-ISOBUTYL-3-METHOXYPYRAZINE × 1	X-RAY DIFFRACTION X-ray crystallization conditions pH 7.8；PROTEIN (0.47MM) IS INCUBATED WITH 10MM OF PYRAZINE., pH 7.80	Resolution 1.48 Å R-free 0.242
1DZK Porcine Odorant Binding Protein Complexed with pyrazine (2-isobutyl-3-metoxypyrazine) Deposited 2000-03-01	Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 2 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric	Chain B 1–157（157 aa）	Not recorded	PRZ 2-ISOBUTYL-3-METHOXYPYRAZINE × 1	X-RAY DIFFRACTION X-ray crystallization conditions pH 7.8；PROTEIN (0.47MM) IS INCUBATED WITH 10MM OF PYRAZINE., pH 7.80	Resolution 1.48 Å R-free 0.242
1DZM Porcine Odorant Binding Protein Complexed with benzoic acid phenylmethylester Deposited 2000-03-03	Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric	Chain A 1–157（157 aa）	Not recorded	BZM BENZOIC ACID PHENYLMETHYLESTER × 1	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 7.8；293 K；PROTEIN (0.47MM) IS INCUBATED WITH 10MM OF PYRAZINE, THE COMPLEX WAS CRYSTALLISED FROM 2M AMMONIUM SULFATE, AND 5% ISOPROPANOL IN HANGING DROPS, AT 20 DEGREES, pH 7.80	Resolution 1.93 Å R-free 0.246
1DZM Porcine Odorant Binding Protein Complexed with benzoic acid phenylmethylester Deposited 2000-03-03	Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 2 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric	Chain B 1–157（157 aa）	Not recorded	BZM BENZOIC ACID PHENYLMETHYLESTER × 1	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 7.8；293 K；PROTEIN (0.47MM) IS INCUBATED WITH 10MM OF PYRAZINE, THE COMPLEX WAS CRYSTALLISED FROM 2M AMMONIUM SULFATE, AND 5% ISOPROPANOL IN HANGING DROPS, AT 20 DEGREES, pH 7.80	Resolution 1.93 Å R-free 0.246
1DZP Porcine Odorant Binding Protein Complexed with diphenylmethanone Deposited 2000-03-06	Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric	Chain A 1–157（157 aa）	Not recorded	BZQ DIPHENYLMETHANONE × 1	X-RAY DIFFRACTION X-ray crystallization conditions pH 7.8；2M AMMONIUM SULFATE, AND 5% ISOPROPANOL, pH 7.80	Resolution 1.83 Å R-free 0.254
1DZP Porcine Odorant Binding Protein Complexed with diphenylmethanone Deposited 2000-03-06	Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 2 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric	Chain B 1–157（157 aa）	Not recorded	BZQ DIPHENYLMETHANONE × 1	X-RAY DIFFRACTION X-ray crystallization conditions pH 7.8；2M AMMONIUM SULFATE, AND 5% ISOPROPANOL, pH 7.80	Resolution 1.83 Å R-free 0.254
1E00 Porcine Odorant Binding Protein Complexed with 2,6-dimethyl-7-octen-2-ol Deposited 2000-03-07	Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric	Chain A 1–157（157 aa）	Not recorded	DHM 2,6-DIMETHYL-7-OCTEN-2-OL × 1	X-RAY DIFFRACTION X-ray crystallization conditions pH 7.8；2M AMMONIUM SULFATE, AND 5% ISOPROPANOL, pH 7.80	Resolution 1.83 Å R-free 0.258
1E00 Porcine Odorant Binding Protein Complexed with 2,6-dimethyl-7-octen-2-ol Deposited 2000-03-07	Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 2 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric	Chain B 1–157（157 aa）	Not recorded	DHM 2,6-DIMETHYL-7-OCTEN-2-OL × 1	X-RAY DIFFRACTION X-ray crystallization conditions pH 7.8；2M AMMONIUM SULFATE, AND 5% ISOPROPANOL, pH 7.80	Resolution 1.83 Å R-free 0.258
1E02 Porcine Odorant Binding Protein Complexed with undecanal Deposited 2000-03-09	Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric	Chain A 1–157（157 aa）	Not recorded	UNA UNDECANAL × 1	X-RAY DIFFRACTION X-ray crystallization conditions pH 7.8；2M AMMONIUM SULFATE, AND 5% ISOPROPANOL, pH 7.80	Resolution 2.15 Å R-free 0.256
1E02 Porcine Odorant Binding Protein Complexed with undecanal Deposited 2000-03-09	Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 2 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric	Chain B 1–157（157 aa）	Not recorded	UNA UNDECANAL × 1	X-RAY DIFFRACTION X-ray crystallization conditions pH 7.8；2M AMMONIUM SULFATE, AND 5% ISOPROPANOL, pH 7.80	Resolution 2.15 Å R-free 0.256
1E06 Porcine Odorant Binding Protein Complexed with 5-methyl-2-(1-methylethyl)phenol Deposited 2000-03-10	Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric	Chain A 1–157（157 aa）	Not recorded	IPB 5-METHYL-2-(1-METHYLETHYL)PHENOL × 1	X-RAY DIFFRACTION X-ray crystallization conditions pH 7.8；2M AMMONIUM SULFATE, AND 5% ISOPROPANOL, pH 7.80	Resolution 2.12 Å R-free 0.255
1E06 Porcine Odorant Binding Protein Complexed with 5-methyl-2-(1-methylethyl)phenol Deposited 2000-03-10	Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 2 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric	Chain B 1–157（157 aa）	Not recorded	IPB 5-METHYL-2-(1-METHYLETHYL)PHENOL × 1	X-RAY DIFFRACTION X-ray crystallization conditions pH 7.8；2M AMMONIUM SULFATE, AND 5% ISOPROPANOL, pH 7.80	Resolution 2.12 Å R-free 0.255
1HQP CRYSTAL STRUCTURE OF A TRUNCATED FORM OF PORCINE ODORANT-BINDING PROTEIN Deposited 2000-12-19	Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric	Chain A 1–157（157 aa）	Not recorded	PRZ 2-ISOBUTYL-3-METHOXYPYRAZINE × 1	X-RAY DIFFRACTION X-ray crystallization conditions MICRODIALYSIS；pH 7.5；293 K；Ammonium sulfate, Tris, ethylene glycol, pH 7.5, MICRODIALYSIS, temperature 293K	Resolution 2.30 Å

8 other PDB entries and 15 assemblies. Open the comparison page and filter oligomeric states

View Construct and Data Evidence

UniProt name	OBP_PIG
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 1–149； UniProt 9–157 Author chain B； PDBConstruct 1–149； UniProt 9–157

The page prioritizes protein identity, the current assembly, associated components, oligomeric state and cross-PDB links. Chain mapping and sequence ranges are retained as data evidence. Internal IDs, import timestamps and assembly operation expressions are maintenance fields and are not shown here.

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2. Structure Basics 2. Structure Basics

Entry ID entry_id	1a3y
Deposition date deposition_date	1998-01-27
Structure title title	ODORANT BINDING PROTEIN FROM NASAL MUCOSA OF PIG
Keywords keywords	LIPOCALIN, OLFACTION; LIPOCALIN
Experimental Method method	X-RAY DIFFRACTION

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3. SAXS Parameters (CRYSOL theoretical calculation) 3. SAXS Parameters (CRYSOL)

Radius of gyration Rg (Guinier) rg_guinier	21.37 Å
Radius of gyration Rg (electron density) rg_electron	20.30 Å
Forward intensity I(0) i0	19838400.00
Molecular weight molecular_weight	33060.0 kDa
Excluded volume excluded_volume	41052 Å³
Envelope volume envelope_volume	49684 Å³
Hydration-shell volume shell_volume	20779 Å³
Envelope diameter envelope_diameter	73.0 Å
Shell Rg shell_rg	26.51 Å
Envelope Rg envelope_rg	20.44 Å
Shape Rg shape_rg	20.29 Å
Total Rg total_rg	21.21 Å
Total atoms total_atoms	2824
Residues n_residues	296
Spherical-harmonic order n_harmonics	20
q range q_range	— – 0.5000 Å⁻¹
Data points n_points	101
Shell type shell_type	directional
Solvent electron density solvent_density	0.3340 e/Å³
Shell contrast contrast_shell	0.0300 e/Å³
CRYSOL version crysol_version	4.1.3

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4. P(r) Distance Distribution (GNOM inversion) 4. P(r) Analysis (GNOM)

Maximum dimension Dmax dmax	73.7 Å
Rg (real space) rg_real	21.36 Å
Rg uncertainty (real space) rg_real_error	0.49 Å
I(0) (real space) i0_real	1.9840e+07
I(0) uncertainty (real space) i0_real_error	2.7740e+05
Rg (reciprocal space) rg_reciprocal	21.36 Å
I(0) (reciprocal space) i0_reciprocal	19840000.0000
Solution quality estimate total_estimate	0.8580
Solution quality rating solution_quality	GOOD a GOOD solution
P(r) peaks n_peaks	2
Primary peak position r_peak_primary	24.9 Å
Skewness Skewness skewness	0.399
Kurtosis Kurtosis kurtosis	-0.148
Angular range angular_range	— – 0.3700 Å⁻¹
Current regularization parameter α current_alpha	0.0000
Highest regularization parameter α highest_alpha	3812000.0000
Real-space data points n_real_points	69
GNOM version gnom_version	4.1.3
Quality Criteria quality_criteria	AN1: 0.000; Oscil: 0.737; Stabil: 1.000; Sysdev: 1.000; Positv: 1.000; Valcen: 0.981; Smooth: 0.957

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5. Crystallography and Experiment 5. Crystallography & Experiment

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6. Entities and Polymers Entities & Polymers (2)

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7. Fold Classification (SCOP + CATH) 4 domains

SCOP 2.08 (2 domains)

Domain ID domain_id	d1a3ya_
Class class	b — All beta proteins
Fold Fold fold	b.60 — Lipocalins
Superfamily Superfamily superfamily	b.60.1 — Lipocalins
Family Family family	b.60.1.1 — Retinol binding protein-like

Domain ID domain_id	d1a3yb_
Class class	b — All beta proteins
Fold Fold fold	b.60 — Lipocalins
Superfamily Superfamily superfamily	b.60.1 — Lipocalins
Family Family family	b.60.1.1 — Retinol binding protein-like

CATH v4.4 (2 domains)

Domain ID domain_id	1a3yA00
Class class	2 — Mainly Beta
Architecture architecture	40 — Beta Barrel
Topology topology	128 — Lipocalin
Homologous superfamily homologous superfamily	20 — Calycin beta-barrel core domain

Domain ID domain_id	1a3yB00
Class class	2 — Mainly Beta
Architecture architecture	40 — Beta Barrel
Topology topology	128 — Lipocalin
Homologous superfamily homologous superfamily	20 — Calycin beta-barrel core domain

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8. Citations (4)

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Unit-cell length a length_a	42.360 Å
Unit-cell length b length_b	88.730 Å
Unit-cell length c length_c	93.190 Å
Unit-cell angle α angle_alpha	90.00 °
Unit-cell angle β angle_beta	90.00 °
Unit-cell angle γ angle_gamma	90.00 °
Molecules per unit cell Z z_pdb	8

Space group space_group	P 21 21 21
Space-group number int_tables_number	19
Crystal system crystal_system	—

Resolution resolution	2.250 Å
Low-resolution limit resolution_low	25.000 Å
R factor r_factor	0.1810
R_work r_work	0.1810
R_free r_free	0.2470

Description description	ODORANT BINDING PROTEIN
Molecular weight formula_weight	16769.5 kDa
Source method src_method	nat
Copy count entity_count	2

Polymer type type	polypeptide(L)
Chain IDs strand_id	A,B
Atom count atom_count	3385

ODORANT BINDING PROTEIN FROM NASAL MUCOSA OF PIG

1. Protein Identity and Related Structures Protein Identity & Related Structures

ODORANT BINDING PROTEIN

State in the Current Structure

Other States of the Same Protein in the Database

SAXS scattering curve SAXS Profile

P(r) Distance Distribution P(r) Distribution

2. Structure Basics 2. Structure Basics

3. SAXS Parameters (CRYSOL theoretical calculation) 3. SAXS Parameters (CRYSOL)

4. P(r) Distance Distribution (GNOM inversion) 4. P(r) Analysis (GNOM)

5. Crystallography and Experiment 5. Crystallography & Experiment

Unit cell Unit Cell

Symmetry Symmetry

Refinement Refinement

Diffraction experiment Diffraction

6. Entities and Polymers Entities & Polymers (2)

Entity 1 Entity 1 polymer

Polymer Polymer

Entity 2 Entity 2 water

7. Fold Classification (SCOP + CATH) 4 domains

SCOP 2.08 (2 domains)

CATH v4.4 (2 domains)

8. Citations (4)

9. Files and Curves (10)

Files (7)

Curves (3)

Description description	water
Molecular weight formula_weight	18.0 kDa
Source method src_method	nat
Copy count entity_count	187

fit	/app/data/saxs_computation/a3/1a3y/1a3y.fit
pddf	/app/data/pr_computation/a3/1a3y/1a3y.pr.out
profile	/app/data/saxs_computation/a3/1a3y/1a3y.dat