4dfr

CRYSTAL STRUCTURES OF ESCHERICHIA COLI AND LACTOBACILLUS CASEI DIHYDROFOLATE REDUCTASE REFINED AT 1.7 ANGSTROMS RESOLUTION. I. GENERAL FEATURES AND BINDING OF METHOTREXATE

Method: X-RAY DIFFRACTION Dmax: 74.9 Å Quality: GOOD

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

DIHYDROFOLATE REDUCTASE

Escherichia coli

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 homooligomer Homooligomer Protein × 2 PDB declaration: dimeric(2) Consistent with protein copy count Chain A; UniProt 1–159 Chain B; UniProt 1–159 Not recorded CL CHLORIDE ION × 2 MTX METHOTREXATE × 2 CA CALCIUM ION × 1 X-RAY DIFFRACTION mmCIF provides none of the parsed experimental conditions Resolution 1.70 Å

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 156 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 4dfr

P(r) Distance Distribution P(r) Distribution

P(r) distribution for 4dfr
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2. Structure Basics 2. Structure Basics

Entry ID entry_id4dfr
Deposition date deposition_date1982-06-25
Structure title titleCRYSTAL STRUCTURES OF ESCHERICHIA COLI AND LACTOBACILLUS CASEI DIHYDROFOLATE REDUCTASE REFINED AT 1.7 ANGSTROMS RESOLUTION. I. GENERAL FEATURES AND BINDING OF METHOTREXATE
Keywords keywordsOXIDO-REDUCTASE, OXIDOREDUCTASE; OXIDOREDUCTASE
Experimental Method methodX-RAY DIFFRACTION

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

Radius of gyration Rg (Guinier) rg_guinier23.22
Radius of gyration Rg (electron density) rg_electron22.61
Forward intensity I(0) i023487300.00
Molecular weight molecular_weight36587.0 kDa
Excluded volume excluded_volume45521 ų
Envelope volume envelope_volume55302 ų
Hydration-shell volume shell_volume21142 ų
Envelope diameter envelope_diameter75.6
Shell Rg shell_rg28.53
Envelope Rg envelope_rg22.56
Shape Rg shape_rg22.58
Total Rg total_rg23.46
Total atoms total_atoms2577
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 dmax74.9
Rg (real space) rg_real23.27
Rg uncertainty (real space) rg_real_error0.43
I(0) (real space) i0_real2.3490e+07
I(0) uncertainty (real space) i0_real_error3.2370e+05
Rg (reciprocal space) rg_reciprocal23.26
I(0) (reciprocal space) i0_reciprocal23490000.0000
Solution quality estimate total_estimate0.8916
Solution quality rating solution_quality GOOD a GOOD solution
P(r) peaks n_peaks2
Primary peak position r_peak_primary24.2
Skewness Skewness skewness0.403
Kurtosis Kurtosis kurtosis-0.397
Angular range angular_range— – 0.3400 −1
Current regularization parameter α current_alpha0.0000
Highest regularization parameter α highest_alpha6233000.0000
Real-space data points n_real_points66
GNOM version gnom_version4.1.3
Quality Criteria quality_criteria AN1: 0.000; Oscil: 0.876; Stabil: 1.000; Sysdev: 1.000; Positv: 1.000; Valcen: 0.977; Smooth: 0.982

5. Crystallography and Experiment 5. Crystallography & Experiment

6. Entities and Polymers Entities & Polymers (5)

7. Fold Classification (SCOP + CATH) 4 domains

SCOP 2.08 (2 domains)

Domain ID domain_idd4dfra_
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_idd4dfrb_
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_id4dfrA00
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_id4dfrB00
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 (11)

9. Files and Curves (10)