2paf

Crystal Structure of the Lactose Repressor bound to anti-inducer ONPF in induced state

Method: X-RAY DIFFRACTION Dmax: 77.7 Å Quality: EXCELLENT

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

Lactose operon repressor

Escherichia coli

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 × 2 PDB declaration: dimeric(2) Consistent with protein copy count Chain A; UniProt 62–330 Chain B; UniProt 62–330 Not recorded NPF 2-nitrophenyl beta-D-fucopyranoside × 2 X-RAY DIFFRACTION X-ray crystallization conditions:VAPOR DIFFUSION, HANGING DROP;pH 5.6;281 K;1.4 M Sodium Acetate, 0.1 M Sodium Citrate, pH 5.6, VAPOR DIFFUSION, HANGING DROP, temperature 281K Resolution 3.50 Å R-free 0.265

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 1–269; UniProt 62–330 Author chain B; PDBConstruct 1–269; UniProt 62–330

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 2paf

P(r) Distance Distribution P(r) Distribution

P(r) distribution for 2paf
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2. Structure Basics 2. Structure Basics

Entry ID entry_id2paf
Deposition date deposition_date2007-03-27
Structure title titleCrystal Structure of the Lactose Repressor bound to anti-inducer ONPF in induced state
Keywords keywordsLac repressor, allosteric effectors, gene regulation, TRANSCRIPTION; TRANSCRIPTION
Experimental Method methodX-RAY DIFFRACTION

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

Radius of gyration Rg (Guinier) rg_guinier24.45
Radius of gyration Rg (electron density) rg_electron23.48
Forward intensity I(0) i056129500.00
Molecular weight molecular_weight58023.0 kDa
Excluded volume excluded_volume72669 ų
Envelope volume envelope_volume83510 ų
Hydration-shell volume shell_volume28897 ų
Envelope diameter envelope_diameter79.8
Shell Rg shell_rg31.23
Envelope Rg envelope_rg23.73
Shape Rg shape_rg23.48
Total Rg total_rg24.33
Total atoms total_atoms4068
Residues n_residues538
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 dmax77.7
Rg (real space) rg_real24.33
Rg uncertainty (real space) rg_real_error0.40
I(0) (real space) i0_real5.6130e+07
I(0) uncertainty (real space) i0_real_error7.9620e+05
Rg (reciprocal space) rg_reciprocal24.36
I(0) (reciprocal space) i0_reciprocal56130000.0000
Solution quality estimate total_estimate0.9017
Solution quality rating solution_quality EXCELLENT a EXCELLENT solution
P(r) peaks n_peaks2
Primary peak position r_peak_primary28.4
Skewness Skewness skewness0.206
Kurtosis Kurtosis kurtosis-0.495
Angular range angular_range— – 0.3250 −1
Current regularization parameter α current_alpha0.0000
Highest regularization parameter α highest_alpha28240000.0000
Real-space data points n_real_points64
GNOM version gnom_version4.1.3
Quality Criteria quality_criteria AN1: 0.000; Oscil: 0.909; Stabil: 1.000; Sysdev: 1.000; Positv: 1.000; Valcen: 1.000; Smooth: 0.992

5. Crystallography and Experiment 5. Crystallography & Experiment

6. Entities and Polymers Entities & Polymers (2)

7. Fold Classification (SCOP + CATH) 6 domains

SCOP 2.08 (2 domains)

Domain ID domain_idd2pafa1
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_idd2pafb1
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 (4 domains)

Domain ID domain_id2pafA01
Class class3 — Alpha Beta
Architecture architecture40 — 3-Layer(aba) Sandwich
Topology topology50 — Rossmann fold
Homologous superfamily homologous superfamily2300 — Response regulator
Domain ID domain_id2pafA02
Class class3 — Alpha Beta
Architecture architecture40 — 3-Layer(aba) Sandwich
Topology topology50 — Rossmann fold
Homologous superfamily homologous superfamily2300 — Response regulator
Domain ID domain_id2pafB01
Class class3 — Alpha Beta
Architecture architecture40 — 3-Layer(aba) Sandwich
Topology topology50 — Rossmann fold
Homologous superfamily homologous superfamily2300 — Response regulator
Domain ID domain_id2pafB02
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)