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2k8m

S100A13-C2A binary complex structure

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

Putative uncharacterized protein

Homo sapiens

UniProt Q6AI31

State in the Current Structure

Assembly Physical composition Protein state Molecular copy count Associated components Data consistency
1 Protein heterocomplex Heteromer Protein 4 Protein S100-A13 × 2 （Q99584） 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
2k8m

1 assemblies

View Construct and Data Evidence
UniProt name Q6AI31_HUMAN
Isoform —
PDB entities 1
Chains and sequence ranges Author chain A； PDBConstruct 3–128； UniProt 143–268 Author chain D； PDBConstruct 3–128； UniProt 143–268

Protein S100-A13

Homo sapiens

UniProt Q99584

State in the Current Structure

Assembly Physical composition Protein state Molecular copy count Associated components Data consistency
1 Protein heterocomplex Heteromer Protein 4 Putative uncharacterized protein × 2 （Q6AI31） Consistent with protein count

Other States of the Same Protein in the Database

Monomer

None

Homodimer
1yur 1yus 1yut 1yuu 2egd 2h2k 2kot

7 assemblies

Homotetramer

None

Other homooligomers

None

Heteromeric or nucleic-acid complex
2k8m 2ki4 2ki6 2l5x 2le9

5 assemblies

View Construct and Data Evidence
UniProt name S10AD_HUMAN
Isoform —
PDB entities 2
Chains and sequence ranges Author chain B； PDBConstruct 1–98； UniProt 1–98 Author chain C； 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_id2k8m
Deposition date deposition_date2008-09-14
Structure title titleS100A13-C2A binary complex structure
Keywords keywordsProtein-Protein complex, S100A13, C2A, PROTEIN TRANSPORT; PROTEIN TRANSPORT
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.

2k8m__assembly_1__model_8

Assembly 1 · Model 8 · CRYSOL 4.1.3-1-20251215 (887e7ef)

Download this curve (.dat)

2k8m__assembly_1__model_8 | I(q)

10-2 10-1 105 106 107 q (1/Angstrom) I(q)
100 plotted points; both axes use logarithmic scales.

2k8m__assembly_1__model_8 | 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）34.58 Å
Rg (electron density)35.41 Å
Total Rg35.16 Å
Atom count7451
Residues452
Excluded volume66539 ų
Maximum q0.500 Å⁻¹
Assembly Model Structure unit Oligomeric description Status CRYSOL Actions
1 1 2k8m__assembly_1__model_1 tetrameric （4） Success 4.1.3-1-20251215 (887e7ef) View Download
1 2 2k8m__assembly_1__model_2 tetrameric （4） Success 4.1.3-1-20251215 (887e7ef) View Download
1 3 2k8m__assembly_1__model_3 tetrameric （4） Success 4.1.3-1-20251215 (887e7ef) View Download
1 4 2k8m__assembly_1__model_4 tetrameric （4） Success 4.1.3-1-20251215 (887e7ef) View Download
1 5 2k8m__assembly_1__model_5 tetrameric （4） Success 4.1.3-1-20251215 (887e7ef) View Download
1 6 2k8m__assembly_1__model_6 tetrameric （4） Success 4.1.3-1-20251215 (887e7ef) View Download
1 7 2k8m__assembly_1__model_7 tetrameric （4） Success 4.1.3-1-20251215 (887e7ef) View Download
1 8 2k8m__assembly_1__model_8 tetrameric （4） Success 4.1.3-1-20251215 (887e7ef) View Download
1 9 2k8m__assembly_1__model_9 tetrameric （4） Success 4.1.3-1-20251215 (887e7ef) View Download
1 10 2k8m__assembly_1__model_10 tetrameric （4） Success 4.1.3-1-20251215 (887e7ef) View Download
1 11 2k8m__assembly_1__model_11 tetrameric （4） Success 4.1.3-1-20251215 (887e7ef) View Download
1 12 2k8m__assembly_1__model_12 tetrameric （4） Success 4.1.3-1-20251215 (887e7ef) View Download
1 13 2k8m__assembly_1__model_13 tetrameric （4） Success 4.1.3-1-20251215 (887e7ef) View Download
1 14 2k8m__assembly_1__model_14 tetrameric （4） Success 4.1.3-1-20251215 (887e7ef) View Download
1 15 2k8m__assembly_1__model_15 tetrameric （4） Success 4.1.3-1-20251215 (887e7ef) View Download
1 16 2k8m__assembly_1__model_16 tetrameric （4） Success 4.1.3-1-20251215 (887e7ef) View Download
1 17 2k8m__assembly_1__model_17 tetrameric （4） Success 4.1.3-1-20251215 (887e7ef) View Download
1 18 2k8m__assembly_1__model_18 tetrameric （4） Success 4.1.3-1-20251215 (887e7ef) View Download
1 19 2k8m__assembly_1__model_19 tetrameric （4） Success 4.1.3-1-20251215 (887e7ef) View Download
1 20 2k8m__assembly_1__model_20 tetrameric （4） 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 (2)

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6. Fold Classification (SCOP + CATH) 10 domains

SCOP 2.08 (6 domains)

Domain ID domain_idd2k8ma1
Class classb — All beta proteins
Fold Fold foldb.7 — C2 domain-like
Superfamily Superfamily superfamilyb.7.1 — C2 domain (Calcium/lipid-binding domain, CaLB)
Family Family familyb.7.1.2 — Synaptotagmin-like (S variant)
Domain ID domain_idd2k8ma2
Class classl — Artifacts
Fold Fold foldl.1 — Tags
Superfamily Superfamily superfamilyl.1.1 — Tags
Family Family familyl.1.1.1 — Tags
Domain ID domain_idd2k8mb_
Class classa — All alpha proteins
Fold Fold folda.39 — EF Hand-like
Superfamily Superfamily superfamilya.39.1 — EF-hand
Family Family familya.39.1.0 — automated matches
Domain ID domain_idd2k8mc_
Class classa — All alpha proteins
Fold Fold folda.39 — EF Hand-like
Superfamily Superfamily superfamilya.39.1 — EF-hand
Family Family familya.39.1.0 — automated matches
Domain ID domain_idd2k8md1
Class classb — All beta proteins
Fold Fold foldb.7 — C2 domain-like
Superfamily Superfamily superfamilyb.7.1 — C2 domain (Calcium/lipid-binding domain, CaLB)
Family Family familyb.7.1.2 — Synaptotagmin-like (S variant)
Domain ID domain_idd2k8md2
Class classl — Artifacts
Fold Fold foldl.1 — Tags
Superfamily Superfamily superfamilyl.1.1 — Tags
Family Family familyl.1.1.1 — Tags

CATH v4.4 (4 domains)

Domain ID domain_id2k8mA00
Class class2 — Mainly Beta
Architecture architecture60 — Sandwich
Topology topology40 — Immunoglobulin-like
Homologous superfamily homologous superfamily150 — C2 domain
Domain ID domain_id2k8mB00
Class class1 — Mainly Alpha
Architecture architecture10 — Orthogonal Bundle
Topology topology238 — Recoverin; domain 1
Homologous superfamily homologous superfamily10 — EF-hand
Domain ID domain_id2k8mC00
Class class1 — Mainly Alpha
Architecture architecture10 — Orthogonal Bundle
Topology topology238 — Recoverin; domain 1
Homologous superfamily homologous superfamily10 — EF-hand
Domain ID domain_id2k8mD00
Class class2 — Mainly Beta
Architecture architecture60 — Sandwich
Topology topology40 — Immunoglobulin-like
Homologous superfamily homologous superfamily150 — C2 domain
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7. Citations (1)