SAXSdb — 1jix

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

DNA BETA-GLUCOSYLTRANSFERASE

Enterobacteria phage T4

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 monomer Monomer Protein × 1 PDB declaration: monomeric（1） Consistent with protein copy count	Chain A； UniProt 1–351	Not recorded	CA CALCIUM ION × 1 UDP URIDINE-5'-DIPHOSPHATE × 1	X-RAY DIFFRACTION X-ray crystallization conditions：VAPOR DIFFUSION, HANGING DROP；pH 7.5；291 K；PEG 10000, pH 7.5, VAPOR DIFFUSION, HANGING DROP, temperature 291K	Resolution 1.65 Å R-free 0.214

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 1JIX	Assembly / Oligomeric State	Construct	Mutations and Modifications	Ligands, Ions and Non-polymers	Method and Experimental Conditions	Structure Quality
1BGT CRYSTAL STRUCTURE OF THE DNA MODIFYING ENZYME BETA-GLUCOSYLTRANSFERASE IN THE PRESENCE AND ABSENCE OF THE SUBSTRATE URIDINE DIPHOSPHOGLUCOSE Deposited 1994-06-09	Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric	Chain A 1–351（351 aa）	Not recorded	No recorded non-water small molecule	X-RAY DIFFRACTION mmCIF provides none of the parsed conditions	Resolution 2.20 Å
1BGU CRYSTAL STRUCTURE OF THE DNA MODIFYING ENZYME BETA-GLUCOSYLTRANSFERASE IN THE PRESENCE AND ABSENCE OF THE SUBSTRATE URIDINE DIPHOSPHOGLUCOSE Deposited 1994-06-09	Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric	Chain A 1–351（351 aa）	Not recorded	UDP URIDINE-5'-DIPHOSPHATE × 1	X-RAY DIFFRACTION mmCIF provides none of the parsed conditions	Resolution 2.20 Å
1C3J T4 PHAGE BETA-GLUCOSYLTRANSFERASE: SUBSTRATE BINDING AND PROPOSED CATALYTIC MECHANISM Deposited 1999-07-28	Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric	Chain A 1–351（351 aa）	Not recorded	UDP URIDINE-5'-DIPHOSPHATE × 1	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 5.6；291 K；AMMONIUM SULFATE, pH 5.6, VAPOR DIFFUSION, HANGING DROP, temperature 18K	Resolution 1.88 Å R-free 0.233
1IXY Ternary complex of T4 phage BGT with UDP and a 13 mer DNA duplex Deposited 2002-07-09	Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein–DNA Monomer；Protein × 1 PDB declaration: trimeric	Chain A 1–351（351 aa）	Not recorded	MG MAGNESIUM ION × 1 UDP URIDINE-5'-DIPHOSPHATE × 1 MPD (4S)-2-METHYL-2,4-PENTANEDIOL × 2	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 7.5；291 K；MPD, tert-butanol, pH 7.5, VAPOR DIFFUSION, HANGING DROP, temperature 291K	Resolution 2.50 Å R-free 0.282
1IXY Ternary complex of T4 phage BGT with UDP and a 13 mer DNA duplex Deposited 2002-07-09	Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 2 Protein–DNA Monomer；Protein × 1 PDB declaration: trimeric	Chain B 1–351（351 aa）	Not recorded	MG MAGNESIUM ION × 2 UDP URIDINE-5'-DIPHOSPHATE × 1 MPD (4S)-2-METHYL-2,4-PENTANEDIOL × 1	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 7.5；291 K；MPD, tert-butanol, pH 7.5, VAPOR DIFFUSION, HANGING DROP, temperature 291K	Resolution 2.50 Å R-free 0.282
1J39 Crystal Structure of T4 phage BGT in complex with its UDP-glucose substrate Deposited 2003-01-21	Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric	Chain A 1–351（351 aa）	Not recorded	UPG URIDINE-5'-DIPHOSPHATE-GLUCOSE × 1 GOL GLYCEROL × 3	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 8.5；292 K；ammonium sulfate, pH 8.5, VAPOR DIFFUSION, HANGING DROP, temperature 292K	Resolution 1.87 Å R-free 0.232
1JEJ T4 phage apo BGT Deposited 2001-06-18	Different ligand/ion Different structure-quality metrics	Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric	Chain A 1–351（351 aa）	Not recorded	No recorded non-water small molecule	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 7.5；291 K；PEG 10000, pH 7.5, VAPOR DIFFUSION, HANGING DROP, temperature 291K	Resolution 2.50 Å R-free 0.264
1JG6 T4 phage BGT in complex with UDP Deposited 2001-06-23	Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric	Chain A 1–351（351 aa）	Not recorded	UDP URIDINE-5'-DIPHOSPHATE × 1	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 7.5；291 K；PEG 4000, pH 7.5, VAPOR DIFFUSION, HANGING DROP, temperature 291K	Resolution 1.90 Å R-free 0.226
1JG7 T4 phage BGT in complex with UDP and Mn2+ Deposited 2001-06-23	Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric	Chain A 1–351（351 aa）	Not recorded	MN MANGANESE (II) ION × 1 UDP URIDINE-5'-DIPHOSPHATE × 1	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 7.5；291 K；PEG4000, pH 7.5, VAPOR DIFFUSION, HANGING DROP, temperature 291K	Resolution 1.65 Å R-free 0.244
1JIU T4 Phage BGT in Complex with Mg2+ : Form I Deposited 2001-07-03	Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric	Chain A 1–351（351 aa）	Not recorded	MG MAGNESIUM ION × 1 UDP URIDINE-5'-DIPHOSPHATE × 1	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 7.5；291 K；PEG 4000, pH 7.5, VAPOR DIFFUSION, HANGING DROP, temperature 291K	Resolution 2.50 Å R-free 0.274
1JIV T4 phage BGT in complex with Mg2+ : Form II Deposited 2001-07-03	Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric	Chain A 1–351（351 aa）	Not recorded	MG MAGNESIUM ION × 2 UDP URIDINE-5'-DIPHOSPHATE × 1	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 7.5；291 K；PEG 4000, pH 7.5, VAPOR DIFFUSION, HANGING DROP, temperature 291K	Resolution 2.07 Å R-free 0.237
1M5R Ternary complex of T4 phage BGT with UDP and a 13 mer DNA duplex Deposited 2002-07-10	Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein–DNA Monomer；Protein × 1 PDB declaration: trimeric	Chain A 1–351（351 aa）	Not recorded	UDP URIDINE-5'-DIPHOSPHATE × 1 TRS 2-AMINO-2-HYDROXYMETHYL-PROPANE-1,3-DIOL × 2 MPD (4S)-2-METHYL-2,4-PENTANEDIOL × 1	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 7.5；291 K；MPD, tert-butanol, pH 7.5, VAPOR DIFFUSION, HANGING DROP, temperature 291K	Resolution 1.80 Å R-free 0.224
1M5R Ternary complex of T4 phage BGT with UDP and a 13 mer DNA duplex Deposited 2002-07-10	Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 2 Protein–DNA Monomer；Protein × 1 PDB declaration: trimeric	Chain B 1–351（351 aa）	Not recorded	UDP URIDINE-5'-DIPHOSPHATE × 1 TRS 2-AMINO-2-HYDROXYMETHYL-PROPANE-1,3-DIOL × 3 MPD (4S)-2-METHYL-2,4-PENTANEDIOL × 2	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 7.5；291 K；MPD, tert-butanol, pH 7.5, VAPOR DIFFUSION, HANGING DROP, temperature 291K	Resolution 1.80 Å R-free 0.224
1NVK T4 phage BGT in complex with UDP and a Mn2+ ion at 1.8 A resolution Deposited 2003-02-04	Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric	Chain A 1–351（351 aa）	Not recorded	MN MANGANESE (II) ION × 1 UDP URIDINE-5'-DIPHOSPHATE × 1 GOL GLYCEROL × 1	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 7.5；292 K；peg4000, pH 7.5, VAPOR DIFFUSION, HANGING DROP, temperature 292K	Resolution 1.80 Å R-free 0.210
1NZD T4 phage BGT-D100A mutant in complex with UDP-glucose: Form I Deposited 2003-02-17	Different mutation/modification Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric	Chain A 1–351（351 aa）	Mutation：D100A	CL CHLORIDE ION × 2 UPG URIDINE-5'-DIPHOSPHATE-GLUCOSE × 1 GOL GLYCEROL × 1	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 7.5；292 K；PEG 4000, glycerol, pH 7.5, VAPOR DIFFUSION, HANGING DROP, temperature 292K	Resolution 2.00 Å R-free 0.215
1NZF T4 phage BGT-D100A mutant in complex with UDP-glucose: Form II Deposited 2003-02-17	Different mutation/modification Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric	Chain A 1–351（351 aa）	Mutation：D100A	CL CHLORIDE ION × 2 UPG URIDINE-5'-DIPHOSPHATE-GLUCOSE × 1 GOL GLYCEROL × 2	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 7.5；292 K；peg 4000, glycerol, pH 7.5, VAPOR DIFFUSION, HANGING DROP, temperature 292K	Resolution 2.10 Å R-free 0.220
1QKJ T4 Phage B-Glucosyltransferase, Substrate Binding and Proposed Catalytic Mechanism Deposited 1999-07-22	Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric	Chain A 1–351（351 aa）	Not recorded	UDP URIDINE-5'-DIPHOSPHATE × 1	X-RAY DIFFRACTION X-ray crystallization conditions pH 7.4；pH 7.40	Resolution 2.30 Å R-free 0.290
1SXP BGT in complex with a 13mer DNA containing a central A:G mismatch Deposited 2004-03-31	Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein–DNA Homooligomer；Protein × 2 PDB declaration: tetrameric	Chain A 1–351（351 aa） Chain B 1–351（351 aa）	Not recorded	PG4 TETRAETHYLENE GLYCOL × 1 GOL GLYCEROL × 3	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 6.5；298 K；PEG 20000, pH 6.5, VAPOR DIFFUSION, HANGING DROP, temperature 298K	Resolution 2.50 Å R-free 0.272
1SXQ BGT in complex with a 13mer DNA containing a central C:G base pair and UDP Deposited 2004-03-31	Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein–DNA Monomer；Protein × 1 PDB declaration: trimeric	Chain A 1–351（351 aa）	Not recorded	UDP URIDINE-5'-DIPHOSPHATE × 1	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 8.5；298 K；PEG 5000, pH 8.5, VAPOR DIFFUSION, HANGING DROP, temperature 298K	Resolution 1.80 Å R-free 0.212
1SXQ BGT in complex with a 13mer DNA containing a central C:G base pair and UDP Deposited 2004-03-31	Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 2 Protein–DNA Monomer；Protein × 1 PDB declaration: trimeric	Chain B 1–351（351 aa）	Not recorded	UDP URIDINE-5'-DIPHOSPHATE × 1	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 8.5；298 K；PEG 5000, pH 8.5, VAPOR DIFFUSION, HANGING DROP, temperature 298K	Resolution 1.80 Å R-free 0.212
2BGT CRYSTAL STRUCTURE OF THE DNA MODIFYING ENZYME BETA-GLUCOSYLTRANSFERASE IN THE PRESENCE AND ABSENCE OF THE SUBSTRATE URIDINE DIPHOSPHOGLUCOSE Deposited 1994-06-09	Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric	Chain A 1–351（351 aa）	Not recorded	No recorded non-water small molecule	X-RAY DIFFRACTION mmCIF provides none of the parsed conditions	Resolution 2.20 Å
2BGU CRYSTAL STRUCTURE OF THE DNA MODIFYING ENZYME BETA-GLUCOSYLTRANSFERASE IN THE PRESENCE AND ABSENCE OF THE SUBSTRATE URIDINE DIPHOSPHOGLUCOSE Deposited 1994-06-09	Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric	Chain A 1–351（351 aa）	Not recorded	UDP URIDINE-5'-DIPHOSPHATE × 1	X-RAY DIFFRACTION mmCIF provides none of the parsed conditions	Resolution 2.20 Å

19 other PDB entries and 22 assemblies. Open the comparison page and filter oligomeric states

View Construct and Data Evidence

UniProt name	GSTB_BPT4
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 1–351； UniProt 1–351

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	1jix
Deposition date deposition_date	2001-07-03
Structure title title	T4 Phage BGT in Complex with Ca2+
Keywords keywords	Glycosyltransferase, TRANSFERASE; TRANSFERASE
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	21.88 Å
Radius of gyration Rg (electron density) rg_electron	21.04 Å
Forward intensity I(0) i0	26662000.00
Molecular weight molecular_weight	41099.0 kDa
Excluded volume excluded_volume	52062 Å³
Envelope volume envelope_volume	59597 Å³
Hydration-shell volume shell_volume	23552 Å³
Envelope diameter envelope_diameter	74.7 Å
Shell Rg shell_rg	27.74 Å
Envelope Rg envelope_rg	21.15 Å
Shape Rg shape_rg	21.05 Å
Total Rg total_rg	21.87 Å
Total atoms total_atoms	2895
Residues n_residues	351
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	73.3 Å
Rg (real space) rg_real	21.82 Å
Rg uncertainty (real space) rg_real_error	0.61 Å
I(0) (real space) i0_real	2.6660e+07
I(0) uncertainty (real space) i0_real_error	4.3840e+05
Rg (reciprocal space) rg_reciprocal	21.83 Å
I(0) (reciprocal space) i0_reciprocal	26660000.0000
Solution quality estimate total_estimate	0.7974
Solution quality rating solution_quality	GOOD a GOOD solution
P(r) peaks n_peaks	2
Primary peak position r_peak_primary	26.3 Å
Skewness Skewness skewness	0.317
Kurtosis Kurtosis kurtosis	-0.320
Angular range angular_range	— – 0.3650 Å⁻¹
Current regularization parameter α current_alpha	0.0000
Highest regularization parameter α highest_alpha	8198000.0000
Real-space data points n_real_points	68
GNOM version gnom_version	4.1.3
Quality Criteria quality_criteria	AN1: 0.000; Oscil: 0.796; Stabil: 0.996; Sysdev: 1.000; Positv: 1.000; Valcen: 0.987; Smooth: 0.000

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5. Crystallography and Experiment 5. Crystallography & Experiment

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6. Entities and Polymers Entities & Polymers (4)

Entity 1 Entity 1 polymer

Description description	DNA BETA-GLUCOSYLTRANSFERASE
Molecular weight formula_weight	40719.9 kDa
EC 编号 ec_number	2.4.1.27
Source method src_method	man
Copy count entity_count	1

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	A
Atom count atom_count	3357

MKIAIINMGNNVINFKTVPSSETIYLFKVISEMGLNVDIISLKNGVYTKSFDEVDVNDYDRLIVVNSSINFFGGKPNLAILSAQKFMAKYKSKIYYLFTDIRLPFSQSWPNVKNRPWAYLYTEEELLIKSPIKVISQGINLDIAKAAHKKVDNVIEFEYFPIEQYKIHMNDFQLSKPTKKTLDVIYGGSFRSGQRESKMVEFLFDTGLNIEFFGNAREKQFKNPKYPWTKAPVFTGKIPMNMVSEKNSQAIAALIIGDKNYNDNFITLRVWETMASDAVMLIDEEFDTKHRIINDARFYVNNRAELIDRVNELKHSDVLRKEMLSIQHDILNKTRAKKAEWQDAFKKAIDL

来源 Source

来源生物 organism	Enterobacteria phage T4
NCBI Class编号 ncbi_taxonomy_id	10665
宿主生物 host_organism	Escherichia coli

Entity 2 Entity 2 non-polymer

Description description	CALCIUM ION
Molecular weight formula_weight	40.1 kDa
Source method src_method	syn
Copy count entity_count	1

Entity 3 Entity 3 non-polymer

Description description	URIDINE-5'-DIPHOSPHATE
Molecular weight formula_weight	404.2 kDa
Source method src_method	syn
Copy count entity_count	1

Entity 4 Entity 4 water

Description description	water
Molecular weight formula_weight	18.0 kDa
Source method src_method	nat
Copy count entity_count	434

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7. Fold Classification (SCOP + CATH) 3 domains

SCOP 2.08 (1 domains)

Domain ID domain_id	d1jixa_
Class class	c — Alpha and beta proteins (a/b)
Fold Fold fold	c.87 — UDP-Glycosyltransferase/glycogen phosphorylase
Superfamily Superfamily superfamily	c.87.1 — UDP-Glycosyltransferase/glycogen phosphorylase
Family Family family	c.87.1.1 — beta-Glucosyltransferase (DNA-modifying)

CATH v4.4 (2 domains)

Domain ID domain_id	1jixA01
Class class	3 — Alpha Beta
Architecture architecture	40 — 3-Layer(aba) Sandwich
Topology topology	50 — Rossmann fold
Homologous superfamily homologous superfamily	2000 — Glycogen Phosphorylase B;

Domain ID domain_id	1jixA02
Class class	3 — Alpha Beta
Architecture architecture	40 — 3-Layer(aba) Sandwich
Topology topology	50 — Rossmann fold
Homologous superfamily homologous superfamily	2000 — Glycogen Phosphorylase B;

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8. Citations (2)

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Unit-cell length a length_a	47.943 Å
Unit-cell length b length_b	71.454 Å
Unit-cell length c length_c	62.010 Å
Unit-cell angle α angle_alpha	90.00 °
Unit-cell angle β angle_beta	91.36 °
Unit-cell angle γ angle_gamma	90.00 °
Molecules per unit cell Z z_pdb	2

Space group space_group	P 1 21 1
Space-group number int_tables_number	4
Crystal system crystal_system	—

Resolution resolution	1.650 Å
Low-resolution limit resolution_low	20.000 Å
R factor r_factor	—
R_work r_work	0.2000
R_free r_free	0.2140

fit	/app/data/saxs_computation/ji/1jix/1jix.fit
pddf	/app/data/pr_computation/ji/1jix/1jix.pr.out
profile	/app/data/saxs_computation/ji/1jix/1jix.dat

T4 Phage BGT in Complex with Ca2+

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

DNA BETA-GLUCOSYLTRANSFERASE

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