1dds

MOLECULE: DIHYDROFOLATE REDUCTASE (E.C.1.5.1.3) COMPLEXED WITH METHOTREXATE

Method: X-RAY DIFFRACTION Dmax: 75.1 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 2.20 Å R-free 0.200

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 1dds

P(r) Distance Distribution P(r) Distribution

P(r) distribution for 1dds
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2. Structure Basics 2. Structure Basics

Entry ID entry_id1dds
Deposition date deposition_date1995-06-29
Structure title titleMOLECULE: DIHYDROFOLATE REDUCTASE (E.C.1.5.1.3) COMPLEXED WITH 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_guinier23.27
Radius of gyration Rg (electron density) rg_electron22.63
Forward intensity I(0) i023742100.00
Molecular weight molecular_weight36515.0 kDa
Excluded volume excluded_volume45324 ų
Envelope volume envelope_volume54432 ų
Hydration-shell volume shell_volume20885 ų
Envelope diameter envelope_diameter75.5
Shell Rg shell_rg28.49
Envelope Rg envelope_rg22.52
Shape Rg shape_rg22.60
Total Rg total_rg23.48
Total atoms total_atoms2572
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 dmax75.1
Rg (real space) rg_real23.32
Rg uncertainty (real space) rg_real_error0.53
I(0) (real space) i0_real2.3740e+07
I(0) uncertainty (real space) i0_real_error3.7200e+05
Rg (reciprocal space) rg_reciprocal23.31
I(0) (reciprocal space) i0_reciprocal23740000.0000
Solution quality estimate total_estimate0.8911
Solution quality rating solution_quality GOOD a GOOD solution
P(r) peaks n_peaks2
Primary peak position r_peak_primary24.3
Skewness Skewness skewness0.396
Kurtosis Kurtosis kurtosis-0.421
Angular range angular_range— – 0.3400 −1
Current regularization parameter α current_alpha0.0000
Highest regularization parameter α highest_alpha5785000.0000
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: 0.974; Smooth: 0.978

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_idd1ddsa_
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_idd1ddsb_
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_id1ddsA00
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_id1ddsB00
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)