SAXSdb — 9bnb

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

Collagen alpha-1(XVIII) chain

Homo sapiens

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein homooligomer	Homooligomer	Protein 3	water × 3	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	COIA1_HUMAN
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 1–57； UniProt 1440–1496 Author chain B； PDBConstruct 1–57； UniProt 1440–1496 Author chain C； PDBConstruct 1–57； UniProt 1440–1496

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	9bnb
Deposition date deposition_date	2024-05-02
Structure title title	Collagen XVIII trimerization domain with introduced inter-chain disulfide bond, G(-1)C-L5C
Keywords keywords	Trimer, Disulfide, Biologic scaffold, STRUCTURAL PROTEIN; STRUCTURAL PROTEIN
Experimental Method method	X-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.

9bnb__assembly_1__model_1

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

Download this curve (.dat)

9bnb__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

9bnb__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	16.56 Å
Rg (electron density)	15.15 Å
Total Rg	16.25 Å
Atom count	2595
Residues	167
Excluded volume	23208 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`9bnb__assembly_1__model_1`	trimeric （3）	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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Unit-cell length a length_a	41.475 Å
Unit-cell length b length_b	42.156 Å
Unit-cell length c length_c	84.464 Å
Unit-cell angle α angle_alpha	90.00 °
Unit-cell angle β angle_beta	90.00 °
Unit-cell angle γ angle_gamma	90.00 °
Molecules per unit cell Z z_pdb	12

Space group space_group	P 21 21 21
Space-group number int_tables_number	19
Crystal system crystal_system	orthorhombic

Resolution resolution	1.500 Å
Low-resolution limit resolution_low	37.720 Å
R factor r_factor	0.2050
R_work r_work	0.2035
R_free r_free	0.2329

Description description	Collagen alpha-1(XVIII) chain
Molecular weight formula_weight	6535.5 kDa
Mutation mutation	;A(-1)C, L5C (authors' numbering) ;
Source method src_method	man
Copy count entity_count	3

Polymer type type	polypeptide(L)
Chain IDs strand_id	A,B,C
Atom count atom_count	2750

Collagen XVIII trimerization domain with introduced inter-chain disulfide bond, G(-1)C-L5C

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

Collagen alpha-1(XVIII) chain

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

9bnb__assembly_1__model_1

9bnb__assembly_1__model_1 | I(q)

9bnb__assembly_1__model_1 | P(r) · Pending

4. Crystallography and Experiment 4. Crystallography & Experiment

Unit cell Unit Cell

Symmetry Symmetry

Refinement Refinement

Diffraction experiment Diffraction

5. Entities and Polymers Entities & Polymers (2)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

Entity 2 Entity 2 water

7. Citations (1)

Source organism organism	Homo sapiens
Common name common_name	human
NCBI taxonomy ID ncbi_taxonomy_id	9606
Host organism host_organism	Escherichia coli BL21(DE3)

Description description	water
Molecular weight formula_weight	18.0 kDa
Source method src_method	nat
Copy count entity_count	110

Collagen XVIII trimerization domain with introduced inter-chain disulfide bond, G(-1)C-L5C

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

Collagen alpha-1(XVIII) chain

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

9bnb__assembly_1__model_1

9bnb__assembly_1__model_1 | I(q)

9bnb__assembly_1__model_1 | P(r) · Pending

4. Crystallography and Experiment 4. Crystallography & Experiment

Unit cell Unit Cell

Symmetry Symmetry

Refinement Refinement

Diffraction experiment Diffraction

5. Entities and Polymers Entities & Polymers (2)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

Entity 2 Entity 2 water

7. Citations (1)