2inq

Neutron Crystal Structure of Escherichia coli Dihydrofolate Reductase Bound to the Anti-cancer drug, Methotrexate

Method: NEUTRON DIFFRACTION Dmax: 78.7 Å Quality: REASONABLE

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

Dihydrofolate reductase

Escherichia coli K12

UniProt P0ABQ4

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 1–159 Mutation:N37D MT1 N-(4-{[(2,4-DIAMINOPTERIDIN-1-IUM-6-YL)METHYL](METHYL)AMINO}BENZOYL)-L-GLUTAMIC ACID × 1 NEUTRON DIFFRACTION X-ray crystallization conditions:pH 7.5;277 K;16% (v/v) Polyethylene Glycol 400, 0.2 M CaCl2, 0.1 M Na-HEPES (pH = 7.5); complex [] = 50 mg/ml, Microbatch under parrafin oil, temperature 277K, pH 7.50 Resolution 2.20 Å R-free 0.233
2 Protein monomer Monomer Protein × 1 PDB declaration: monomeric(1) Consistent with protein copy count Chain B; UniProt 1–159 Mutation:N37D MT1 N-(4-{[(2,4-DIAMINOPTERIDIN-1-IUM-6-YL)METHYL](METHYL)AMINO}BENZOYL)-L-GLUTAMIC ACID × 1 NEUTRON DIFFRACTION X-ray crystallization conditions:pH 7.5;277 K;16% (v/v) Polyethylene Glycol 400, 0.2 M CaCl2, 0.1 M Na-HEPES (pH = 7.5); complex [] = 50 mg/ml, Microbatch under parrafin oil, temperature 277K, pH 7.50 Resolution 2.20 Å R-free 0.233

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.

141 other PDB entries and 155 assemblies. Open the comparison page and filter oligomeric states

View Construct and Data Evidence
UniProt name DYR_ECOLI
Isoform
PDB entities 1
Chains and sequence ranges Author chain A; PDBConstruct 1–159; UniProt 1–159 Author chain B; PDBConstruct 1–159; UniProt 1–159

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 2inq

P(r) Distance Distribution P(r) Distribution

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

Entry ID entry_id2inq
Deposition date deposition_date2006-10-08
Structure title titleNeutron Crystal Structure of Escherichia coli Dihydrofolate Reductase Bound to the Anti-cancer drug, Methotrexate
Keywords keywordsNeutron Structure; Deuterium Exchange; Pseudo-Rossman Fold; Nucleotide Binding Domain; Chemotherapy, OXIDOREDUCTASE; OXIDOREDUCTASE
Experimental Method methodNEUTRON DIFFRACTION

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

Radius of gyration Rg (Guinier) rg_guinier23.68
Radius of gyration Rg (electron density) rg_electron22.80
Forward intensity I(0) i026347400.00
Molecular weight molecular_weight40095.0 kDa
Excluded volume excluded_volume50217 ų
Envelope volume envelope_volume67569 ų
Hydration-shell volume shell_volume24745 ų
Envelope diameter envelope_diameter79.1
Shell Rg shell_rg29.97
Envelope Rg envelope_rg23.26
Shape Rg shape_rg22.92
Total Rg total_rg23.44
Total atoms total_atoms5468
Residues n_residues318
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 dmax78.7
Rg (real space) rg_real23.72
Rg uncertainty (real space) rg_real_error0.47
I(0) (real space) i0_real2.6350e+07
I(0) uncertainty (real space) i0_real_error3.5290e+05
Rg (reciprocal space) rg_reciprocal23.71
I(0) (reciprocal space) i0_reciprocal26350000.0000
Solution quality estimate total_estimate0.7154
Solution quality rating solution_quality REASONABLE a REASONABLE solution
P(r) peaks n_peaks1
Primary peak position r_peak_primary25.8
Skewness Skewness skewness0.407
Kurtosis Kurtosis kurtosis-0.346
Angular range angular_range— – 0.3350 −1
Current regularization parameter α current_alpha0.0000
Highest regularization parameter α highest_alpha10710000.0000
Real-space data points n_real_points65
GNOM version gnom_version4.1.3
Quality Criteria quality_criteria AN1: 0.000; Oscil: 0.833; Stabil: 1.000; Sysdev: 0.286; Positv: 1.000; Valcen: 0.963; Smooth: 0.975

5. Crystallography and Experiment 5. Crystallography & Experiment

6. Entities and Polymers Entities & Polymers (3)

7. Fold Classification (SCOP + CATH) 4 domains

SCOP 2.08 (2 domains)

Domain ID domain_idd2inqa_
Class classc — Alpha and beta proteins (a/b)
Fold Fold foldc.71 — Dihydrofolate reductase-like
Superfamily Superfamily superfamilyc.71.1 — Dihydrofolate reductase-like
Family Family familyc.71.1.1 — Dihydrofolate reductases
Domain ID domain_idd2inqb_
Class classc — Alpha and beta proteins (a/b)
Fold Fold foldc.71 — Dihydrofolate reductase-like
Superfamily Superfamily superfamilyc.71.1 — Dihydrofolate reductase-like
Family Family familyc.71.1.1 — Dihydrofolate reductases

CATH v4.4 (2 domains)

Domain ID domain_id2inqA00
Class class3 — Alpha Beta
Architecture architecture40 — 3-Layer(aba) Sandwich
Topology topology430 — Dihydrofolate Reductase, subunit A
Homologous superfamily homologous superfamily10 — Dihydrofolate Reductase, subunit A
Domain ID domain_id2inqB00
Class class3 — Alpha Beta
Architecture architecture40 — 3-Layer(aba) Sandwich
Topology topology430 — Dihydrofolate Reductase, subunit A
Homologous superfamily homologous superfamily10 — Dihydrofolate Reductase, subunit A

8. Citations (1)

9. Files and Curves (10)