SAXSdb — 4g43

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

MHC class I alpha chain 2

Gallus gallus

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein heterocomplex	Heteromer	Protein 3	Beta-2 microglobulin × 1 （P21611） 8-MERIC PEPTIDE P5E × 1 water × 3	Consistent with protein count
2	Protein heterocomplex	Heteromer	Protein 3	Beta-2 microglobulin × 1 （P21611） 8-MERIC PEPTIDE P5E × 1 (4S)-2-METHYL-2,4-PENTANEDIOL × 1 water × 3	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	O46790_CHICK
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 4–273； UniProt 22–291 Author chain D； PDBConstruct 4–273； UniProt 22–291

Beta-2 microglobulin

Gallus gallus

UniProt P21611

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein heterocomplex	Heteromer	Protein 3	MHC class I alpha chain 2 × 1 （O46790） 8-MERIC PEPTIDE P5E × 1 water × 3	Consistent with protein count
2	Protein heterocomplex	Heteromer	Protein 3	MHC class I alpha chain 2 × 1 （O46790） 8-MERIC PEPTIDE P5E × 1 (4S)-2-METHYL-2,4-PENTANEDIOL × 1 water × 3	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	B2MG_CHICK
Isoform	—
PDB entities	2
Chains and sequence ranges	Author chain B； PDBConstruct 4–101； UniProt 22–119 Author chain E； PDBConstruct 4–101； UniProt 22–119

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	4g43
Deposition date deposition_date	2012-07-16
Structure title title	Structure of the chicken MHC class I molecule BF2*0401 complexed to P5E
Keywords keywords	MHC I complex, narrow binding groove, 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.

4g43__assembly_1__model_1

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

Download this curve (.dat)

4g43__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

4g43__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	23.71 Å
Rg (electron density)	22.84 Å
Total Rg	23.74 Å
Atom count	3060
Residues	377
Excluded volume	53627 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`4g43__assembly_1__model_1`	trimeric （3）	Success	4.1.3-1-20251215 (887e7ef)	View Download
2	1	`4g43__assembly_2__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 (5)

Entity 1 Entity 1 polymer

Description description	MHC class I alpha chain 2
Molecular weight formula_weight	31853.5 kDa
Mutation mutation	D244E
Source method src_method	man
Copy count entity_count	2

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	A,D
Atom count atom_count	6721

MEFELHTLRYIRTAMTDPGPGQPWFVTVGYVDGELFVHYNSTARRYVPRTEWIAANTDQQYWDGQTQIGQLNEQINRENLGIRQRRYNQTGGSHTVQWMFGCDILEDGTIRGYRQSAYDGRDFIALDKDMKTFTAAVPEAVPTKRKWEEESEPERWKNYLEETCVEWLRRYVEYGKAELGRRERPEVRVWGKEADGILTLSCRAHGFYPRPIVVSWLKDGAVRGQDAHSGGIVPNGDGTYHTWVTIEAQPGDGDKYQCRVEHASLPQPGLYSWKL

Source Source

Source organism organism	Gallus gallus
NCBI taxonomy ID ncbi_taxonomy_id	9031
Host organism host_organism	Escherichia coli

Entity 2 Entity 2 polymer

Description description	Beta-2 microglobulin
Molecular weight formula_weight	11469.9 kDa
Source method src_method	man
Copy count entity_count	2

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	B,E

MEFDLTPKVQVYSRFPASAGTKNVLNCFAAGFHPPKISITLMKDGVPMEGAQYSDMSFNDDWTFQRLVHADFTPSSGSTYACKVEHETLKEPQVYKWDPEF

Source Source

Source organism organism	Gallus gallus
NCBI taxonomy ID ncbi_taxonomy_id	9031
Host organism host_organism	Escherichia coli

Entity 3 Entity 3 polymer

Description description	8-MERIC PEPTIDE P5E
Molecular weight formula_weight	1024.1 kDa
Source method src_method	syn
Copy count entity_count	2

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	C,F

IDWFEGKE

Entity 4 Entity 4 non-polymer

Description description	(4S)-2-METHYL-2,4-PENTANEDIOL
Molecular weight formula_weight	118.2 kDa
Source method src_method	syn
Copy count entity_count	1

Entity 5 Entity 5 water

Description description	water
Molecular weight formula_weight	18.0 kDa
Source method src_method	nat
Copy count entity_count	606

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6. Fold Classification (SCOP + CATH) 6 domains

CATH v4.4 (6 domains)

Domain ID domain_id	4g43A01
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	500 — Murine Class I Major Histocompatibility Complex, H2-DB; Chain A, domain 1
Homologous superfamily homologous superfamily	10 — MHC class I-like antigen recognition-like

Domain ID domain_id	4g43A02
Class class	2 — Mainly Beta
Architecture architecture	60 — Sandwich
Topology topology	40 — Immunoglobulin-like
Homologous superfamily homologous superfamily	10 — Immunoglobulins

Domain ID domain_id	4g43B00
Class class	2 — Mainly Beta
Architecture architecture	60 — Sandwich
Topology topology	40 — Immunoglobulin-like
Homologous superfamily homologous superfamily	10 — Immunoglobulins

Domain ID domain_id	4g43D01
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	500 — Murine Class I Major Histocompatibility Complex, H2-DB; Chain A, domain 1
Homologous superfamily homologous superfamily	10 — MHC class I-like antigen recognition-like

Domain ID domain_id	4g43D02
Class class	2 — Mainly Beta
Architecture architecture	60 — Sandwich
Topology topology	40 — Immunoglobulin-like
Homologous superfamily homologous superfamily	10 — Immunoglobulins

Domain ID domain_id	4g43E00
Class class	2 — Mainly Beta
Architecture architecture	60 — Sandwich
Topology topology	40 — Immunoglobulin-like
Homologous superfamily homologous superfamily	10 — Immunoglobulins

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Unit-cell length a length_a	166.920 Å
Unit-cell length b length_b	40.241 Å
Unit-cell length c length_c	132.622 Å
Unit-cell angle α angle_alpha	90.00 °
Unit-cell angle β angle_beta	120.35 °
Unit-cell angle γ angle_gamma	90.00 °
Molecules per unit cell Z z_pdb	8

Space group space_group	C 1 2 1
Space-group number int_tables_number	5
Crystal system crystal_system	—

Resolution resolution	1.803 Å
Low-resolution limit resolution_low	41.306 Å
R factor r_factor	0.1849
R_work r_work	0.1832
R_free r_free	0.2179

Structure of the chicken MHC class I molecule BF2*0401 complexed to P5E

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

MHC class I alpha chain 2

State in the Current Structure

Other States of the Same Protein in the Database

Beta-2 microglobulin

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

4g43__assembly_1__model_1

4g43__assembly_1__model_1 | I(q)

4g43__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 (5)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

Entity 2 Entity 2 polymer

Polymer Polymer

Source Source

Entity 3 Entity 3 polymer

Polymer Polymer

Entity 4 Entity 4 non-polymer

Entity 5 Entity 5 water

6. Fold Classification (SCOP + CATH) 6 domains

CATH v4.4 (6 domains)

7. Citations (1)

Structure of the chicken MHC class I molecule BF2*0401 complexed to P5E

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

MHC class I alpha chain 2

State in the Current Structure

Other States of the Same Protein in the Database

Monomer

Homodimer

Homotetramer

Other homooligomers

Heteromeric or nucleic-acid complex

Beta-2 microglobulin

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

4g43__assembly_1__model_1

4g43__assembly_1__model_1 | I(q)

4g43__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 (5)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

Entity 2 Entity 2 polymer

Polymer Polymer

Source Source

Entity 3 Entity 3 polymer

Polymer Polymer

Entity 4 Entity 4 non-polymer

Entity 5 Entity 5 water

6. Fold Classification (SCOP + CATH) 6 domains

CATH v4.4 (6 domains)

7. Citations (1)