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2kt4

Lipocalin Q83 is a Siderocalin

Method: SOLUTION NMR
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1. Protein Identity and Related Structures Protein Identity & Related Structures

Extracellular fatty acid-binding protein

Coturnix japonica

UniProt Q9I9P7

State in the Current Structure

Assembly Physical composition Protein state Molecular copy count Associated components Data consistency
1 Protein monomer Monomer Protein 1 N,N',N''-[(3S,7S,11S)-2,6,10-trioxo-1,5,9-trioxacyclododecane-3,7,11-triyl]tris(2,3-dihydroxybenzamide) × 1 GALLIUM (III) ION × 1 Consistent with protein count

Other States of the Same Protein in the Database

Monomer
1jzu 2kt4 2lbv

3 assemblies

Homodimer

None

Homotetramer

None

Other homooligomers

None

Heteromeric or nucleic-acid complex

None

View Construct and Data Evidence
UniProt name EXFAB_COTJA
Isoform —
PDB entities 1
Chains and sequence ranges Author chain B； PDBConstruct 2–157； UniProt 23–178

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_id2kt4
Deposition date deposition_date2010-01-18
Structure title titleLipocalin Q83 is a Siderocalin
Keywords keywordsSiderocalin, Lipocalin, Enterobactin, Disulfide bond, Secreted, Transport, TRANSPORT PROTEIN; TRANSPORT PROTEIN
Experimental Method methodSOLUTION NMR
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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.

2kt4__assembly_1__model_18

Assembly 1 · Model 18 · CRYSOL 4.1.3-1-20251215 (887e7ef)

Download this curve (.dat)

2kt4__assembly_1__model_18 | I(q)

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

2kt4__assembly_1__model_18 | 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）16.86 Å
Rg (electron density)15.60 Å
Total Rg16.82 Å
Atom count2596
Residues157
Excluded volume23413 ų
Maximum q0.500 Å⁻¹
Assembly Model Structure unit Oligomeric description Status CRYSOL Actions
1 1 2kt4__assembly_1__model_1 monomeric （1） Success 4.1.3-1-20251215 (887e7ef) View Download
1 2 2kt4__assembly_1__model_2 monomeric （1） Success 4.1.3-1-20251215 (887e7ef) View Download
1 3 2kt4__assembly_1__model_3 monomeric （1） Success 4.1.3-1-20251215 (887e7ef) View Download
1 4 2kt4__assembly_1__model_4 monomeric （1） Success 4.1.3-1-20251215 (887e7ef) View Download
1 5 2kt4__assembly_1__model_5 monomeric （1） Success 4.1.3-1-20251215 (887e7ef) View Download
1 6 2kt4__assembly_1__model_6 monomeric （1） Success 4.1.3-1-20251215 (887e7ef) View Download
1 7 2kt4__assembly_1__model_7 monomeric （1） Success 4.1.3-1-20251215 (887e7ef) View Download
1 8 2kt4__assembly_1__model_8 monomeric （1） Success 4.1.3-1-20251215 (887e7ef) View Download
1 9 2kt4__assembly_1__model_9 monomeric （1） Success 4.1.3-1-20251215 (887e7ef) View Download
1 10 2kt4__assembly_1__model_10 monomeric （1） Success 4.1.3-1-20251215 (887e7ef) View Download
1 11 2kt4__assembly_1__model_11 monomeric （1） Success 4.1.3-1-20251215 (887e7ef) View Download
1 12 2kt4__assembly_1__model_12 monomeric （1） Success 4.1.3-1-20251215 (887e7ef) View Download
1 13 2kt4__assembly_1__model_13 monomeric （1） Success 4.1.3-1-20251215 (887e7ef) View Download
1 14 2kt4__assembly_1__model_14 monomeric （1） Success 4.1.3-1-20251215 (887e7ef) View Download
1 15 2kt4__assembly_1__model_15 monomeric （1） Success 4.1.3-1-20251215 (887e7ef) View Download
1 16 2kt4__assembly_1__model_16 monomeric （1） Success 4.1.3-1-20251215 (887e7ef) View Download
1 17 2kt4__assembly_1__model_17 monomeric （1） Success 4.1.3-1-20251215 (887e7ef) View Download
1 18 2kt4__assembly_1__model_18 monomeric （1） Success 4.1.3-1-20251215 (887e7ef) View Download
1 19 2kt4__assembly_1__model_19 monomeric （1） Success 4.1.3-1-20251215 (887e7ef) View Download
1 20 2kt4__assembly_1__model_20 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 (3)

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6. Fold Classification (SCOP + CATH) 3 domains

SCOP 2.08 (2 domains)

Domain ID domain_idd2kt4b1
Class classb — All beta proteins
Fold Fold foldb.60 — Lipocalins
Superfamily Superfamily superfamilyb.60.1 — Lipocalins
Family Family familyb.60.1.1 — Retinol binding protein-like
Domain ID domain_idd2kt4b2
Class classl — Artifacts
Fold Fold foldl.1 — Tags
Superfamily Superfamily superfamilyl.1.1 — Tags
Family Family familyl.1.1.1 — Tags

CATH v4.4 (1 domains)

Domain ID domain_id2kt4B01
Class class2 — Mainly Beta
Architecture architecture40 — Beta Barrel
Topology topology128 — Lipocalin
Homologous superfamily homologous superfamily20 — Calycin beta-barrel core domain
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7. Citations (1)