3edc

Crystal Structure of a 1.6-hexanediol Bound Tetrameric Form of Escherichia coli Lac-repressor Refined to 2.1 Resolution

Method: X-RAY DIFFRACTION Dmax: 95.2 Å Quality: EXCELLENT

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

Lactose operon repressor

Escherichia coli K12

UniProt P03023

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 × 4 PDB declaration: tetrameric(4) Consistent with protein copy count Chain A; UniProt 1–360 Chain B; UniProt 1–360 Chain C; UniProt 1–360 Chain D; UniProt 1–360 Not recorded HEZ HEXANE-1,6-DIOL × 4 X-RAY DIFFRACTION X-ray crystallization conditions:VAPOR DIFFUSION, HANGING DROP;pH 7.5;294 K;microseeded, pH 7.5, VAPOR DIFFUSION, HANGING DROP, temperature 294K Resolution 2.10 Å R-free 0.201

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.

21 other PDB entries and 25 assemblies. Open the comparison page and filter oligomeric states

View Construct and Data Evidence
UniProt name LACI_ECOLI
Isoform
PDB entities 1
Chains and sequence ranges Author chain A; PDBConstruct 1–360; UniProt 1–360 Author chain B; PDBConstruct 1–360; UniProt 1–360 Author chain C; PDBConstruct 1–360; UniProt 1–360 Author chain D; PDBConstruct 1–360; UniProt 1–360

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.

SAXS scattering curve SAXS Profile

SAXS profile for 3edc

P(r) Distance Distribution P(r) Distribution

P(r) distribution for 3edc
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2. Structure Basics 2. Structure Basics

Entry ID entry_id3edc
Deposition date deposition_date2008-09-03
Structure title titleCrystal Structure of a 1.6-hexanediol Bound Tetrameric Form of Escherichia coli Lac-repressor Refined to 2.1 Resolution
Keywords keywordsLac-repressor, allosteric, tetramer, DNA-binding, Repressor, Transcription, Transcription regulation; TRANSCRIPTION
Experimental Method methodX-RAY DIFFRACTION

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

Radius of gyration Rg (Guinier) rg_guinier31.48
Radius of gyration Rg (electron density) rg_electron30.44
Forward intensity I(0) i0263843000.00
Molecular weight molecular_weight128380.0 kDa
Excluded volume excluded_volume160530 ų
Envelope volume envelope_volume194090 ų
Hydration-shell volume shell_volume50508 ų
Envelope diameter envelope_diameter98.9
Shell Rg shell_rg39.52
Envelope Rg envelope_rg30.31
Shape Rg shape_rg30.44
Total Rg total_rg31.16
Total atoms total_atoms8996
Residues n_residues1200
Spherical-harmonic order n_harmonics20
q range q_range— – 0.5000 −1
Data points n_points101
Shell type shell_typedirectional
Solvent electron density solvent_density0.3340 e/ų
Shell contrast contrast_shell0.0300 e/ų
CRYSOL version crysol_version4.1.3

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

Maximum dimension Dmax dmax95.2
Rg (real space) rg_real31.26
Rg uncertainty (real space) rg_real_error0.45
I(0) (real space) i0_real2.6380e+08
I(0) uncertainty (real space) i0_real_error3.3250e+06
Rg (reciprocal space) rg_reciprocal31.36
I(0) (reciprocal space) i0_reciprocal263900000.0000
Solution quality estimate total_estimate0.9011
Solution quality rating solution_quality EXCELLENT a EXCELLENT solution
P(r) peaks n_peaks0
Primary peak position r_peak_primary
Skewness Skewness skewness0.126
Kurtosis Kurtosis kurtosis-0.483
Angular range angular_range— – 0.2500 −1
Current regularization parameter α current_alpha0.0000
Highest regularization parameter α highest_alpha95380000.0000
Real-space data points n_real_points51
GNOM version gnom_version4.1.3
Quality Criteria quality_criteria AN1: 0.000; Oscil: 0.934; Stabil: 1.000; Sysdev: 1.000; Positv: 1.000; Valcen: 0.975; Smooth: 0.935

5. Crystallography and Experiment 5. Crystallography & Experiment

6. Entities and Polymers Entities & Polymers (3)

7. Fold Classification (SCOP + CATH) 12 domains

SCOP 2.08 (4 domains)

Domain ID domain_idd3edca_
Class classc — Alpha and beta proteins (a/b)
Fold Fold foldc.93 — Periplasmic binding protein-like I
Superfamily Superfamily superfamilyc.93.1 — Periplasmic binding protein-like I
Family Family familyc.93.1.1 — L-arabinose binding protein-like
Domain ID domain_idd3edcb_
Class classc — Alpha and beta proteins (a/b)
Fold Fold foldc.93 — Periplasmic binding protein-like I
Superfamily Superfamily superfamilyc.93.1 — Periplasmic binding protein-like I
Family Family familyc.93.1.1 — L-arabinose binding protein-like
Domain ID domain_idd3edcc_
Class classc — Alpha and beta proteins (a/b)
Fold Fold foldc.93 — Periplasmic binding protein-like I
Superfamily Superfamily superfamilyc.93.1 — Periplasmic binding protein-like I
Family Family familyc.93.1.1 — L-arabinose binding protein-like
Domain ID domain_idd3edcd_
Class classc — Alpha and beta proteins (a/b)
Fold Fold foldc.93 — Periplasmic binding protein-like I
Superfamily Superfamily superfamilyc.93.1 — Periplasmic binding protein-like I
Family Family familyc.93.1.1 — L-arabinose binding protein-like

CATH v4.4 (8 domains)

Domain ID domain_id3edcA01
Class class3 — Alpha Beta
Architecture architecture40 — 3-Layer(aba) Sandwich
Topology topology50 — Rossmann fold
Homologous superfamily homologous superfamily2300 — Response regulator
Domain ID domain_id3edcA02
Class class3 — Alpha Beta
Architecture architecture40 — 3-Layer(aba) Sandwich
Topology topology50 — Rossmann fold
Homologous superfamily homologous superfamily2300 — Response regulator
Domain ID domain_id3edcB01
Class class3 — Alpha Beta
Architecture architecture40 — 3-Layer(aba) Sandwich
Topology topology50 — Rossmann fold
Homologous superfamily homologous superfamily2300 — Response regulator
Domain ID domain_id3edcB02
Class class3 — Alpha Beta
Architecture architecture40 — 3-Layer(aba) Sandwich
Topology topology50 — Rossmann fold
Homologous superfamily homologous superfamily2300 — Response regulator
Domain ID domain_id3edcC01
Class class3 — Alpha Beta
Architecture architecture40 — 3-Layer(aba) Sandwich
Topology topology50 — Rossmann fold
Homologous superfamily homologous superfamily2300 — Response regulator
Domain ID domain_id3edcC02
Class class3 — Alpha Beta
Architecture architecture40 — 3-Layer(aba) Sandwich
Topology topology50 — Rossmann fold
Homologous superfamily homologous superfamily2300 — Response regulator
Domain ID domain_id3edcD01
Class class3 — Alpha Beta
Architecture architecture40 — 3-Layer(aba) Sandwich
Topology topology50 — Rossmann fold
Homologous superfamily homologous superfamily2300 — Response regulator
Domain ID domain_id3edcD02
Class class3 — Alpha Beta
Architecture architecture40 — 3-Layer(aba) Sandwich
Topology topology50 — Rossmann fold
Homologous superfamily homologous superfamily2300 — Response regulator

8. Citations (1)

9. Files and Curves (10)