SAXSdb — 9d9q

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

Immunoglobulin gamma-1 heavy chain Fc fragment

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	IGG1_HUMAN
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 20–231； UniProt 238–449 Author chain B； PDBConstruct 20–231； UniProt 238–449

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	9d9q
Deposition date deposition_date	2024-08-21
Last revision last_revision	2026-03-18
Structure title title	Crystal structure of IgG1 FC M252R at pH 8.0
Keywords keywords	IgG1, FC, igG FC, Fragment crystallizable, Antigen, Antibody, Immunoglobulin, M252R, pH 8.0, IMMUNE SYSTEM; IMMUNE SYSTEM
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.

9d9q__assembly_1__model_1

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

Download this curve (.dat)

9d9q__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

9d9q__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	26.68 Å
Rg (electron density)	25.34 Å
Total Rg	26.24 Å
Atom count	3282
Residues	408
Excluded volume	58299 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`9d9q__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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Unit-cell length a length_a	48.667 Å
Unit-cell length b length_b	78.930 Å
Unit-cell length c length_c	137.658 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	8

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

Resolution resolution	2.820 Å
Low-resolution limit resolution_low	45.400 Å
R factor r_factor	0.2873
R_work r_work	0.2836
R_free r_free	0.3672

Description description	Immunoglobulin gamma-1 heavy chain Fc fragment
Molecular weight formula_weight	25990.5 kDa
Mutation mutation	M252R
Source method src_method	man
Copy count entity_count	2

Polymer type type	polypeptide(L)
Chain IDs strand_id	B,A
Atom count atom_count	3282

Crystal structure of IgG1 FC M252R at pH 8.0

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

Immunoglobulin gamma-1 heavy chain Fc fragment

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

9d9q__assembly_1__model_1

9d9q__assembly_1__model_1 | I(q)

9d9q__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 (1)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

7. Citations (1)

Source organism organism	Homo sapiens
Common name common_name	human
NCBI taxonomy ID ncbi_taxonomy_id	9606
Host organism host_organism	Homo sapiens

Crystal structure of IgG1 FC M252R at pH 8.0

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

Immunoglobulin gamma-1 heavy chain Fc fragment

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

9d9q__assembly_1__model_1

9d9q__assembly_1__model_1 | I(q)

9d9q__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 (1)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

7. Citations (1)