9pwk

P21A Mutant of E. coli Dihydrofolate Reductase Complexed with Folate and Nicotinamide Adenine Dinucleotide Phosphate (oxidized form)

Method: X-RAY DIFFRACTION Dmax: 51.9 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 monomer Monomer Protein × 1 PDB declaration: monomeric(1) Consistent with protein copy count Chain A; UniProt 1–159 Mutation:P21A FOL FOLIC ACID × 1 NAP NADP NICOTINAMIDE-ADENINE-DINUCLEOTIDE PHOSPHATE × 1 CA CALCIUM ION × 1 X-RAY DIFFRACTION X-ray crystallization conditions:VAPOR DIFFUSION, HANGING DROP;pH 8;298 K;PEG 6000, Calcium chloride, Tris Resolution 1.51 Å R-free 0.220

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

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 9pwk

P(r) Distance Distribution P(r) Distribution

P(r) distribution for 9pwk
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2. Structure Basics 2. Structure Basics

Entry ID entry_id9pwk
Deposition date deposition_date2025-08-04
最后修订 last_revision2026-02-04
Structure title titleP21A Mutant of E. coli Dihydrofolate Reductase Complexed with Folate and Nicotinamide Adenine Dinucleotide Phosphate (oxidized form)
Keywords keywordsP21A, DHFR, OXIDOREDUCTASE; OXIDOREDUCTASE
Experimental Method methodX-RAY DIFFRACTION

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

Radius of gyration Rg (Guinier) rg_guinier16.62
Radius of gyration Rg (electron density) rg_electron15.24
Forward intensity I(0) i07512020.00
Molecular weight molecular_weight19188.0 kDa
Excluded volume excluded_volume23586 ų
Envelope volume envelope_volume26444 ų
Hydration-shell volume shell_volume14552 ų
Envelope diameter envelope_diameter51.5
Shell Rg shell_rg21.25
Envelope Rg envelope_rg15.56
Shape Rg shape_rg15.22
Total Rg total_rg16.31
Total atoms total_atoms1347
Residues n_residues159
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 dmax51.9
Rg (real space) rg_real16.49
Rg uncertainty (real space) rg_real_error0.27
I(0) (real space) i0_real7.5120e+06
I(0) uncertainty (real space) i0_real_error8.7070e+04
Rg (reciprocal space) rg_reciprocal16.51
I(0) (reciprocal space) i0_reciprocal7512000.0000
Solution quality estimate total_estimate0.8959
Solution quality rating solution_quality GOOD a GOOD solution
P(r) peaks n_peaks2
Primary peak position r_peak_primary22.3
Skewness Skewness skewness0.118
Kurtosis Kurtosis kurtosis-0.431
Angular range angular_range— – 0.4800 −1
Current regularization parameter α current_alpha0.0000
Highest regularization parameter α highest_alpha1738000.0000
Real-space data points n_real_points78
GNOM version gnom_version4.1.3
Quality Criteria quality_criteria AN1: 0.000; Oscil: 0.894; Stabil: 1.000; Sysdev: 1.000; Positv: 1.000; Valcen: 0.989; Smooth: 0.971

5. Crystallography and Experiment 5. Crystallography & Experiment

6. Entities and Polymers Entities & Polymers (5)

8. Citations (1)

9. Files and Curves (10)