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1kqg

FORMATE DEHYDROGENASE N FROM E. COLI

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

FORMATE DEHYDROGENASE, NITRATE-INDUCIBLE, MAJOR SUBUNIT

OrganismNot specified

UniProt P24183

State in the Current Structure

Assembly Physical composition Protein state Molecular copy count Associated components Data consistency
1 Protein heterocomplex Heteromer Protein 9 FORMATE DEHYDROGENASE, NITRATE-INDUCIBLE, IRON-SULFUR SUBUNIT × 3 （P0AAJ3） FORMATE DEHYDROGENASE, NITRATE-INDUCIBLE, CYTOCHROME B556(FDN) SUBUNIT × 3 （P24185） IRON/SULFUR CLUSTER × 15 2-AMINO-5,6-DIMERCAPTO-7-METHYL-3,7,8A,9-TETRAHYDRO-8-OXA-1,3,9,10-TETRAAZA-ANTHRACEN-4-ONE GUANOSINE DINUCLEOTIDE × 6 MOLYBDENUM(VI) ION × 3 CARDIOLIPIN × 3 PROTOPORPHYRIN IX CONTAINING FE × 6 2-HEPTYL-4-HYDROXY QUINOLINE N-OXIDE × 3 water × 9 Consistent with protein count

Other States of the Same Protein in the Database

Monomer

None

Homodimer

None

Homotetramer

None

Other homooligomers

None

Heteromeric or nucleic-acid complex
1kqf 1kqg

2 assemblies

View Construct and Data Evidence
UniProt name FDNG_ECOLI
Isoform —
PDB entities 1
Chains and sequence ranges Author chain A； PDBConstruct 1–1015； UniProt 1–1015

FORMATE DEHYDROGENASE, NITRATE-INDUCIBLE, IRON-SULFUR SUBUNIT

OrganismNot specified

UniProt P0AAJ3

State in the Current Structure

Assembly Physical composition Protein state Molecular copy count Associated components Data consistency
1 Protein heterocomplex Heteromer Protein 9 FORMATE DEHYDROGENASE, NITRATE-INDUCIBLE, MAJOR SUBUNIT × 3 （P24183） FORMATE DEHYDROGENASE, NITRATE-INDUCIBLE, CYTOCHROME B556(FDN) SUBUNIT × 3 （P24185） IRON/SULFUR CLUSTER × 15 2-AMINO-5,6-DIMERCAPTO-7-METHYL-3,7,8A,9-TETRAHYDRO-8-OXA-1,3,9,10-TETRAAZA-ANTHRACEN-4-ONE GUANOSINE DINUCLEOTIDE × 6 MOLYBDENUM(VI) ION × 3 CARDIOLIPIN × 3 PROTOPORPHYRIN IX CONTAINING FE × 6 2-HEPTYL-4-HYDROXY QUINOLINE N-OXIDE × 3 water × 9 Consistent with protein count

Other States of the Same Protein in the Database

Monomer

None

Homodimer

None

Homotetramer

None

Other homooligomers

None

Heteromeric or nucleic-acid complex
1kqf 1kqg

2 assemblies

View Construct and Data Evidence
UniProt name FDNH_ECOLI
Isoform —
PDB entities 2
Chains and sequence ranges Author chain B； PDBConstruct 1–294； UniProt 1–294

FORMATE DEHYDROGENASE, NITRATE-INDUCIBLE, CYTOCHROME B556(FDN) SUBUNIT

OrganismNot specified

UniProt P24185

State in the Current Structure

Assembly Physical composition Protein state Molecular copy count Associated components Data consistency
1 Protein heterocomplex Heteromer Protein 9 FORMATE DEHYDROGENASE, NITRATE-INDUCIBLE, MAJOR SUBUNIT × 3 （P24183） FORMATE DEHYDROGENASE, NITRATE-INDUCIBLE, IRON-SULFUR SUBUNIT × 3 （P0AAJ3） IRON/SULFUR CLUSTER × 15 2-AMINO-5,6-DIMERCAPTO-7-METHYL-3,7,8A,9-TETRAHYDRO-8-OXA-1,3,9,10-TETRAAZA-ANTHRACEN-4-ONE GUANOSINE DINUCLEOTIDE × 6 MOLYBDENUM(VI) ION × 3 CARDIOLIPIN × 3 PROTOPORPHYRIN IX CONTAINING FE × 6 2-HEPTYL-4-HYDROXY QUINOLINE N-OXIDE × 3 water × 9 Consistent with protein count

Other States of the Same Protein in the Database

Monomer

None

Homodimer

None

Homotetramer

None

Other homooligomers

None

Heteromeric or nucleic-acid complex
1kqf 1kqg

2 assemblies

View Construct and Data Evidence
UniProt name FDNI_ECOLI
Isoform —
PDB entities 3
Chains and sequence ranges Author chain C； PDBConstruct 1–217； UniProt 1–217

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_id1kqg
Deposition date deposition_date2002-01-05
Structure title titleFORMATE DEHYDROGENASE N FROM E. COLI
Keywords keywords;OXIDOREDUCTASE, SELENIUM, SELENOCYSTEINE, SECYS, MOLYBDENUM, MOLYBDOPTERIN, MPT, MOLYBDOPTERIN GUANINE DINUCLEOTIDE, MGD, IRON SULFUR CLUSTER, FE4S4, FORMATE, DEHYDROGENASE, ANAEROBIC, INTEGRAL MEMBRANE PROTEIN ;; 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.

1kqg__assembly_1__model_1

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

Download this curve (.dat)

1kqg__assembly_1__model_1 | I(q)

10-2 10-1 106 107 108 109 q (1/Angstrom) I(q)
100 plotted points; both axes use logarithmic scales.

1kqg__assembly_1__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）51.41 Å
Rg (electron density)51.71 Å
Total Rg51.43 Å
Atom count36057
Residues4461
Excluded volume641340 ų
Maximum q0.500 Å⁻¹
Assembly Model Structure unit Oligomeric description Status CRYSOL Actions
1 1 1kqg__assembly_1__model_1 nonameric （9） 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 (10)

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6. Fold Classification (SCOP + CATH) 12 domains

SCOP 2.08 (5 domains)

Domain ID domain_idd1kqga1
Class classb — All beta proteins
Fold Fold foldb.52 — Double psi beta-barrel
Superfamily Superfamily superfamilyb.52.2 — ADC-like
Family Family familyb.52.2.2 — Formate dehydrogenase/DMSO reductase, C-terminal domain
Domain ID domain_idd1kqga2
Class classc — Alpha and beta proteins (a/b)
Fold Fold foldc.81 — Formate dehydrogenase/DMSO reductase, domains 1-3
Superfamily Superfamily superfamilyc.81.1 — Formate dehydrogenase/DMSO reductase, domains 1-3
Family Family familyc.81.1.1 — Formate dehydrogenase/DMSO reductase, domains 1-3
Domain ID domain_idd1kqgb1
Class classd — Alpha and beta proteins (a+b)
Fold Fold foldd.58 — Ferredoxin-like
Superfamily Superfamily superfamilyd.58.1 — 4Fe-4S ferredoxins
Family Family familyd.58.1.5 — Ferredoxin domains from multidomain proteins
Domain ID domain_idd1kqgb2
Class classf — Membrane and cell surface proteins and peptides
Fold Fold foldf.23 — Single transmembrane helix
Superfamily Superfamily superfamilyf.23.22 — Iron-sulfur subunit of formate dehydrogenase N, transmembrane anchor
Family Family familyf.23.22.1 — Iron-sulfur subunit of formate dehydrogenase N, transmembrane anchor
Domain ID domain_idd1kqgc_
Class classf — Membrane and cell surface proteins and peptides
Fold Fold foldf.21 — Heme-binding four-helical bundle
Superfamily Superfamily superfamilyf.21.1 — Transmembrane di-heme cytochromes
Family Family familyf.21.1.1 — Formate dehydrogenase N, cytochrome (gamma) subunit

CATH v4.4 (7 domains)

Domain ID domain_id1kqgA02
Class class3 — Alpha Beta
Architecture architecture40 — 3-Layer(aba) Sandwich
Topology topology50 — Rossmann fold
Homologous superfamily homologous superfamily740 —
Domain ID domain_id1kqgA03
Class class3 — Alpha Beta
Architecture architecture40 — 3-Layer(aba) Sandwich
Topology topology228 — Dimethylsulfoxide Reductase; domain 2
Homologous superfamily homologous superfamily10 — Dimethylsulfoxide Reductase, domain 2
Domain ID domain_id1kqgA04
Class class2 — Mainly Beta
Architecture architecture40 — Beta Barrel
Topology topology40 — Barwin-like endoglucanases
Homologous superfamily homologous superfamily20 —
Domain ID domain_id1kqgB01
Class class3 — Alpha Beta
Architecture architecture30 — 2-Layer Sandwich
Topology topology70 — Alpha-Beta Plaits
Homologous superfamily homologous superfamily20 —
Domain ID domain_id1kqgB02
Class class3 — Alpha Beta
Architecture architecture30 — 2-Layer Sandwich
Topology topology70 — Alpha-Beta Plaits
Homologous superfamily homologous superfamily20 —
Domain ID domain_id1kqgB03
Class class1 — Mainly Alpha
Architecture architecture20 — Up-down Bundle
Topology topology5 — Single alpha-helices involved in coiled-coils or other helix-helix interfaces
Homologous superfamily homologous superfamily480 — Single helix bin
Domain ID domain_id1kqgC00
Class class1 — Mainly Alpha
Architecture architecture20 — Up-down Bundle
Topology topology950 — Fumarate Reductase Cytochrome B subunit
Homologous superfamily homologous superfamily20 — Transmembrane di-heme cytochromes, Chain C
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7. Citations (1)