SAXSdb — 5i8n

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1. Protein Identity and Related Structures Protein Identity & Related Structures

Protein S100-A9

Homo sapiens

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

View Construct and Data Evidence

UniProt name	S10A9_HUMAN
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 1–114； UniProt 1–114 Author chain B； PDBConstruct 1–114； UniProt 1–114

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_id	5i8n
Deposition date deposition_date	2016-02-19
Structure title title	Solution Structure of human calcium-binding S100A9 (C3S) protein
Keywords keywords	calgranulin B, homodimer, calcium-binding, migration inhibitory factor-related protein 14 (MRP14), METAL BINDING PROTEIN; METAL BINDING PROTEIN
Experimental Method method	SOLUTION 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.

5i8n__assembly_1__model_8

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

Download this curve (.dat)

5i8n__assembly_1__model_8 | I(q)

100 plotted points; both axes use logarithmic scales.

5i8n__assembly_1__model_8 | P(r) · Pending

P(r) will be calculated and displayed separately for the same assembly/model.

Rg（Guinier）	18.98 Å
Rg (electron density)	17.62 Å
Total Rg	18.59 Å
Atom count	3678
Residues	228
Excluded volume	32686 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`5i8n__assembly_1__model_1`	dimeric （2）	Success	4.1.3-1-20251215 (887e7ef)	View Download
1	2	`5i8n__assembly_1__model_2`	dimeric （2）	Success	4.1.3-1-20251215 (887e7ef)	View Download
1	3	`5i8n__assembly_1__model_3`	dimeric （2）	Success	4.1.3-1-20251215 (887e7ef)	View Download
1	4	`5i8n__assembly_1__model_4`	dimeric （2）	Success	4.1.3-1-20251215 (887e7ef)	View Download
1	5	`5i8n__assembly_1__model_5`	dimeric （2）	Success	4.1.3-1-20251215 (887e7ef)	View Download
1	6	`5i8n__assembly_1__model_6`	dimeric （2）	Success	4.1.3-1-20251215 (887e7ef)	View Download
1	7	`5i8n__assembly_1__model_7`	dimeric （2）	Success	4.1.3-1-20251215 (887e7ef)	View Download
1	8	`5i8n__assembly_1__model_8`	dimeric （2）	Success	4.1.3-1-20251215 (887e7ef)	View Download
1	9	`5i8n__assembly_1__model_9`	dimeric （2）	Success	4.1.3-1-20251215 (887e7ef)	View Download
1	10	`5i8n__assembly_1__model_10`	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_id	d5i8na_
Class class	a — All alpha proteins
Fold Fold fold	a.39 — EF Hand-like
Superfamily Superfamily superfamily	a.39.1 — EF-hand
Family Family family	a.39.1.2 — S100 proteins

Domain ID domain_id	d5i8nb_
Class class	a — All alpha proteins
Fold Fold fold	a.39 — EF Hand-like
Superfamily Superfamily superfamily	a.39.1 — EF-hand
Family Family family	a.39.1.2 — S100 proteins

CATH v4.4 (2 domains)

Domain ID domain_id	5i8nA00
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	238 — Recoverin; domain 1
Homologous superfamily homologous superfamily	10 — EF-hand

Domain ID domain_id	5i8nB00
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	238 — Recoverin; domain 1
Homologous superfamily homologous superfamily	10 — EF-hand

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Description description	Protein S100-A9
Molecular weight formula_weight	13248.0 kDa
Mutation mutation	C3S
Source method src_method	man
Copy count entity_count	2

Polymer type type	polypeptide(L)
Chain IDs strand_id	A,B
Atom count atom_count	36780

Source organism organism	Homo sapiens
Common name common_name	Human
NCBI taxonomy ID ncbi_taxonomy_id	9606
Host organism host_organism	;Escherichia coli 'BL21-Gold(DE3)pLysS AG' ;

Solution Structure of human calcium-binding S100A9 (C3S) protein

1. Protein Identity and Related Structures Protein Identity & Related Structures

Protein S100-A9

State in the Current Structure

Other States of the Same Protein in the Database

2. Structure Basics 2. Structure Basics

3. Official assembly/model SAXS Official SAXS Profiles

5i8n__assembly_1__model_8

5i8n__assembly_1__model_8 | I(q)

5i8n__assembly_1__model_8 | P(r) · Pending

4. Crystallography and Experiment 4. Crystallography & Experiment

5. Entities and Polymers Entities & Polymers (1)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

6. Fold Classification (SCOP + CATH) 4 domains

SCOP 2.08 (2 domains)

CATH v4.4 (2 domains)

7. Citations (1)

Solution Structure of human calcium-binding S100A9 (C3S) protein

1. Protein Identity and Related Structures Protein Identity & Related Structures

Protein S100-A9

State in the Current Structure

Other States of the Same Protein in the Database

Monomer

Homodimer

Homotetramer

Other homooligomers

Heteromeric or nucleic-acid complex

2. Structure Basics 2. Structure Basics

3. Official assembly/model SAXS Official SAXS Profiles

5i8n__assembly_1__model_8

5i8n__assembly_1__model_8 | I(q)

5i8n__assembly_1__model_8 | P(r) · Pending

4. Crystallography and Experiment 4. Crystallography & Experiment

5. Entities and Polymers Entities & Polymers (1)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

6. Fold Classification (SCOP + CATH) 4 domains

SCOP 2.08 (2 domains)

CATH v4.4 (2 domains)

7. Citations (1)