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3fl9

Crystal structure of B. anthracis dihydrofolate reductase (DHFR) with trimethoprim

Method: X-RAY DIFFRACTION
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1. Protein Identity and Related Structures Protein Identity & Related Structures

dihydrofolate reductase (DHFR)

Bacillus anthracis

UniProt Q81R22

State in the Current Structure

Assembly Physical composition Protein state Molecular copy count Associated components Data consistency
1 Protein monomer Monomer Protein 1 CALCIUM ION × 1 TRIMETHOPRIM × 1 water × 1 Consistent with protein count
2 Protein monomer Monomer Protein 1 CALCIUM ION × 1 TRIMETHOPRIM × 1 water × 1 Consistent with protein count
3 Protein monomer Monomer Protein 1 CALCIUM ION × 1 TRIMETHOPRIM × 1 water × 1 Consistent with protein count
4 Protein monomer Monomer Protein 1 CALCIUM ION × 1 TRIMETHOPRIM × 1 water × 1 Consistent with protein count
5 Protein monomer Monomer Protein 1 CALCIUM ION × 1 TRIMETHOPRIM × 1 water × 1 Consistent with protein count
6 Protein monomer Monomer Protein 1 CALCIUM ION × 1 TRIMETHOPRIM × 1 water × 1 Consistent with protein count
7 Protein monomer Monomer Protein 1 CALCIUM ION × 1 TRIMETHOPRIM × 1 water × 1 Consistent with protein count
8 Protein monomer Monomer Protein 1 CALCIUM ION × 1 TRIMETHOPRIM × 1 water × 1 Consistent with protein count

Other States of the Same Protein in the Database

Monomer
2kgk 2qk8 3dat 3e0b 3e0b 3fl8 3fl8 3fl8 3fl8 3fl8 3fl8 3fl8

74 assemblies; showing the first 12

Homodimer
3jvx 3jvx 3jwc 3jwc 3jwf 3jwf 3jwk 3jwk 3jwm 3jwm

10 assemblies

Homotetramer

None

Other homooligomers

None

Heteromeric or nucleic-acid complex

None

View Construct and Data Evidence
UniProt name Q81R22_BACAN
Isoform —
PDB entities 1
Chains and sequence ranges Author chain A； PDBConstruct 1–162； UniProt 1–162 Author chain B； PDBConstruct 1–162； UniProt 1–162 Author chain C； PDBConstruct 1–162； UniProt 1–162 Author chain D； PDBConstruct 1–162； UniProt 1–162 Author chain E； PDBConstruct 1–162； UniProt 1–162 Author chain F； PDBConstruct 1–162； UniProt 1–162 Author chain G； PDBConstruct 1–162； UniProt 1–162 Author chain H； PDBConstruct 1–162； UniProt 1–162

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.

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2. Structure Basics 2. Structure Basics

Entry ID entry_id3fl9
Deposition date deposition_date2008-12-18
Structure title titleCrystal structure of B. anthracis dihydrofolate reductase (DHFR) with trimethoprim
Keywords keywordsOXIDOREDUCTASE, PYRIMIDINE, DIHYDROPHTHALAZINE; OXIDOREDUCTASE
Experimental Method methodX-RAY DIFFRACTION
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3. Official assembly/model SAXS Official SAXS Profiles

This page reads only the latest assembly calculations. Every curve maps to an explicit PDB entry, official biological assembly and coordinate model.

3fl9__assembly_5__model_1

Assembly 5 · Model 1 · CRYSOL 4.1.3-1-20251215 (887e7ef)

Download this curve (.dat)

3fl9__assembly_5__model_1 | I(q)

10-2 10-1 105 106 q (1/Angstrom) I(q)
100 plotted points; both axes use logarithmic scales.

3fl9__assembly_5__model_1 | P(r) · Pending

The new assembly/model P(r) has not been calculated yet This placeholder does not display legacy data r (Angstrom) P(r)
P(r) will be calculated and displayed separately for the same assembly/model.
Rg（Guinier）17.01 Å
Rg (electron density)15.69 Å
Total Rg16.81 Å
Atom count1349
Residues164
Excluded volume24090 ų
Maximum q0.500 Å⁻¹
Assembly Model Structure unit Oligomeric description Status CRYSOL Actions
1 1 3fl9__assembly_1__model_1 monomeric （1） Success 4.1.3-1-20251215 (887e7ef) View Download
2 1 3fl9__assembly_2__model_1 monomeric （1） Success 4.1.3-1-20251215 (887e7ef) View Download
3 1 3fl9__assembly_3__model_1 monomeric （1） Success 4.1.3-1-20251215 (887e7ef) View Download
4 1 3fl9__assembly_4__model_1 monomeric （1） Success 4.1.3-1-20251215 (887e7ef) View Download
5 1 3fl9__assembly_5__model_1 monomeric （1） Success 4.1.3-1-20251215 (887e7ef) View Download
6 1 3fl9__assembly_6__model_1 monomeric （1） Success 4.1.3-1-20251215 (887e7ef) View Download
7 1 3fl9__assembly_7__model_1 monomeric （1） Success 4.1.3-1-20251215 (887e7ef) View Download
8 1 3fl9__assembly_8__model_1 monomeric （1） Success 4.1.3-1-20251215 (887e7ef) View Download
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4. Crystallography and Experiment 4. Crystallography & Experiment

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5. Entities and Polymers Entities & Polymers (4)

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6. Fold Classification (SCOP + CATH) 23 domains

SCOP 2.08 (15 domains)

Domain ID domain_idd3fl9a1
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.71.1.0 — automated matches
Domain ID domain_idd3fl9a2
Class classl — Artifacts
Fold Fold foldl.1 — Tags
Superfamily Superfamily superfamilyl.1.1 — Tags
Family Family familyl.1.1.1 — Tags
Domain ID domain_idd3fl9b_
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.71.1.0 — automated matches
Domain ID domain_idd3fl9c1
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.71.1.0 — automated matches
Domain ID domain_idd3fl9c2
Class classl — Artifacts
Fold Fold foldl.1 — Tags
Superfamily Superfamily superfamilyl.1.1 — Tags
Family Family familyl.1.1.1 — Tags
Domain ID domain_idd3fl9d1
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.71.1.0 — automated matches
Domain ID domain_idd3fl9d2
Class classl — Artifacts
Fold Fold foldl.1 — Tags
Superfamily Superfamily superfamilyl.1.1 — Tags
Family Family familyl.1.1.1 — Tags
Domain ID domain_idd3fl9e1
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.71.1.0 — automated matches
Domain ID domain_idd3fl9e2
Class classl — Artifacts
Fold Fold foldl.1 — Tags
Superfamily Superfamily superfamilyl.1.1 — Tags
Family Family familyl.1.1.1 — Tags
Domain ID domain_idd3fl9f1
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.71.1.0 — automated matches
Domain ID domain_idd3fl9f2
Class classl — Artifacts
Fold Fold foldl.1 — Tags
Superfamily Superfamily superfamilyl.1.1 — Tags
Family Family familyl.1.1.1 — Tags
Domain ID domain_idd3fl9g1
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.71.1.0 — automated matches
Domain ID domain_idd3fl9g2
Class classl — Artifacts
Fold Fold foldl.1 — Tags
Superfamily Superfamily superfamilyl.1.1 — Tags
Family Family familyl.1.1.1 — Tags
Domain ID domain_idd3fl9h1
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.71.1.0 — automated matches
Domain ID domain_idd3fl9h2
Class classl — Artifacts
Fold Fold foldl.1 — Tags
Superfamily Superfamily superfamilyl.1.1 — Tags
Family Family familyl.1.1.1 — Tags

CATH v4.4 (8 domains)

Domain ID domain_id3fl9A00
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_id3fl9B00
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_id3fl9C00
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_id3fl9D00
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_id3fl9E00
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_id3fl9F00
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_id3fl9G00
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_id3fl9H00
Class class3 — Alpha Beta
Architecture architecture40 — 3-Layer(aba) Sandwich
Topology topology430 — Dihydrofolate Reductase, subunit A
Homologous superfamily homologous superfamily10 — Dihydrofolate Reductase, subunit A
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7. Citations (1)