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1n9j

Solution Structure of the 3D domain swapped dimer of Stefin A

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

Cystatin A

Homo sapiens

UniProt P01040

State in the Current Structure

Assembly Physical composition Protein state Molecular copy count Associated components Data consistency
1 Protein homooligomer Homooligomer Protein 2 No other associated polymer Consistent with protein count

Other States of the Same Protein in the Database

Monomer
1cyu 1cyv 1dvc 1dvd 1gd3 1gd4

6 assemblies

Homodimer
1n9j

1 assemblies

Homotetramer

None

Other homooligomers

None

Heteromeric or nucleic-acid complex
1nb3 1nb3 1nb3 1nb3 1nb5 1nb5 1nb5 1nb5 3k9m 3k9m 3kfq 3kfq

18 assemblies; showing the first 12

View Construct and Data Evidence
UniProt name CYTA_HUMAN
Isoform —
PDB entities 1
Chains and sequence ranges Author chain A； PDBConstruct 1–98； UniProt 1–98 Author chain B； PDBConstruct 1–98； UniProt 1–98

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_id1n9j
Deposition date deposition_date2002-11-25
Structure title titleSolution Structure of the 3D domain swapped dimer of Stefin A
Keywords keywordsdomain swapped, stefin A, cystatins, amyloid, HYDROLASE INHIBITOR; HYDROLASE INHIBITOR
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.

1n9j__assembly_1__model_1

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

Download this curve (.dat)

1n9j__assembly_1__model_1 | I(q)

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

1n9j__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）24.65 Å
Rg (electron density)24.01 Å
Total Rg24.65 Å
Atom count3140
Residues196
Excluded volume27760 ų
Maximum q0.500 Å⁻¹
Assembly Model Structure unit Oligomeric description Status CRYSOL Actions
1 1 1n9j__assembly_1__model_1 dimeric （2） 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 (1)

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6. Fold Classification (SCOP + CATH) 4 domains

SCOP 2.08 (2 domains)

Domain ID domain_idd1n9ja_
Class classd — Alpha and beta proteins (a+b)
Fold Fold foldd.17 — Cystatin-like
Superfamily Superfamily superfamilyd.17.1 — Cystatin/monellin
Family Family familyd.17.1.2 — Cystatins
Domain ID domain_idd1n9jb_
Class classd — Alpha and beta proteins (a+b)
Fold Fold foldd.17 — Cystatin-like
Superfamily Superfamily superfamilyd.17.1 — Cystatin/monellin
Family Family familyd.17.1.2 — Cystatins

CATH v4.4 (2 domains)

Domain ID domain_id1n9jA00
Class class3 — Alpha Beta
Architecture architecture10 — Roll
Topology topology450 — Nuclear Transport Factor 2; Chain: A,
Homologous superfamily homologous superfamily10 —
Domain ID domain_id1n9jB00
Class class3 — Alpha Beta
Architecture architecture10 — Roll
Topology topology450 — Nuclear Transport Factor 2; Chain: A,
Homologous superfamily homologous superfamily10 —
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7. Citations (1)