SAXSdb — 3p77

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

MHC Rfp-Y class I alpha chain

Gallus gallus

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein heterocomplex	Heteromer	Protein 2	Beta-2-microglobulin × 1 （P21611） ACETATE ION × 3 TRIETHYLENE GLYCOL × 2 NONAETHYLENE GLYCOL × 1 water × 2	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	Q9BCW3_CHICK
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 1–275； UniProt 20–294

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 2	MHC Rfp-Y class I alpha chain × 1 （Q9BCW3） ACETATE ION × 3 TRIETHYLENE GLYCOL × 2 NONAETHYLENE GLYCOL × 1 water × 2	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 1–99； UniProt 21–119

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	3p77
Deposition date deposition_date	2010-10-12
Structure title title	Crystal Structures of the Chicken YF1*7.1 molecule
Keywords keywords	IG-LIKE C1-TYPE (IMMUNOGLOBULIN-LIKE) DOMAIN, HISTOCOMPATIBILITY ANTIGEN, 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.

3p77__assembly_1__model_1

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

Download this curve (.dat)

3p77__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

3p77__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	23.88 Å
Rg (electron density)	22.93 Å
Total Rg	23.81 Å
Atom count	3038
Residues	371
Excluded volume	53443 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`3p77__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 (6)

Entity 1 Entity 1 polymer

Description description	MHC Rfp-Y class I alpha chain
Molecular weight formula_weight	31667.4 kDa
Source method src_method	man
Copy count entity_count	1

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	A
Atom count atom_count	3498

EFGSHSLRYFLTGMTDPGPGMPRFVIVGYVDDKIFGTYNSKSRTAQPIVEMLPQEDQEHWDTQTQKAQGGERDFDWNLNRLPERYNKSKGSHTMQMMFGCDILEDGSIRGYDQYAFDGRDFLAFDMDTMTFTAADPVAEITKRRWETEGTYAERWKHELGTVCVQNLRRYLEHGKAALKRRVQPEVRVWGKEADGILTLSCHAHGFYPRPITISWMKDGMVRDQETRWGGIVPNSDGTYHASAAIDVLPEDGDKYWCRVEHASLPQPGLFSWEPQ

Source Source

Source organism organism	Gallus gallus
Common name common_name	bantam,chickens
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	11133.5 kDa
Source method src_method	man
Copy count entity_count	1

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	B

ADLTPKVQVYSRFPASAGTKNVLNCFAAGFHPPKISITLMKDGVPMEGAQYSDMSFNDDWTFQRLVHADFTPSSGSTYACKVEHETLKEPQVYKWDPEF

Source Source

Source organism organism	Gallus gallus
Common name common_name	bantam,chickens
NCBI taxonomy ID ncbi_taxonomy_id	9031
Host organism host_organism	Escherichia coli

Entity 3 Entity 3 non-polymer

Description description	ACETATE ION
Molecular weight formula_weight	59.0 kDa
Source method src_method	syn
Copy count entity_count	3

Entity 4 Entity 4 non-polymer

Description description	TRIETHYLENE GLYCOL
Molecular weight formula_weight	150.2 kDa
Source method src_method	syn
Copy count entity_count	2

Entity 5 Entity 5 non-polymer

Description description	NONAETHYLENE GLYCOL
Molecular weight formula_weight	414.5 kDa
Source method src_method	syn
Copy count entity_count	1

Entity 6 Entity 6 water

Description description	water
Molecular weight formula_weight	18.0 kDa
Source method src_method	nat
Copy count entity_count	382

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6. Fold Classification (SCOP + CATH) 6 domains

SCOP 2.08 (3 domains)

Domain ID domain_id	d3p77a1
Class class	d — Alpha and beta proteins (a+b)
Fold Fold fold	d.19 — MHC antigen-recognition domain
Superfamily Superfamily superfamily	d.19.1 — MHC antigen-recognition domain
Family Family family	d.19.1.0 — automated matches

Domain ID domain_id	d3p77a2
Class class	b — All beta proteins
Fold Fold fold	b.1 — Immunoglobulin-like beta-sandwich
Superfamily Superfamily superfamily	b.1.1 — Immunoglobulin
Family Family family	b.1.1.0 — automated matches

Domain ID domain_id	d3p77b_
Class class	b — All beta proteins
Fold Fold fold	b.1 — Immunoglobulin-like beta-sandwich
Superfamily Superfamily superfamily	b.1.1 — Immunoglobulin
Family Family family	b.1.1.0 — automated matches

CATH v4.4 (3 domains)

Domain ID domain_id	3p77A01
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	3p77A02
Class class	2 — Mainly Beta
Architecture architecture	60 — Sandwich
Topology topology	40 — Immunoglobulin-like
Homologous superfamily homologous superfamily	10 — Immunoglobulins

Domain ID domain_id	3p77B00
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	52.870 Å
Unit-cell length b length_b	55.040 Å
Unit-cell length c length_c	63.590 Å
Unit-cell angle α angle_alpha	90.00 °
Unit-cell angle β angle_beta	97.04 °
Unit-cell angle γ angle_gamma	90.00 °
Molecules per unit cell Z z_pdb	2

Space group space_group	P 1 21 1
Space-group number int_tables_number	4
Crystal system crystal_system	—

Resolution resolution	1.600 Å
Low-resolution limit resolution_low	19.650 Å
R factor r_factor	0.1760
R_work r_work	0.1739
R_free r_free	0.2155

Crystal Structures of the Chicken YF1*7.1 molecule

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

MHC Rfp-Y class I alpha chain

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

3p77__assembly_1__model_1

3p77__assembly_1__model_1 | I(q)

3p77__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 (6)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

Entity 2 Entity 2 polymer

Polymer Polymer

Source Source

Entity 3 Entity 3 non-polymer

Entity 4 Entity 4 non-polymer

Entity 5 Entity 5 non-polymer

Entity 6 Entity 6 water

6. Fold Classification (SCOP + CATH) 6 domains

SCOP 2.08 (3 domains)

CATH v4.4 (3 domains)

7. Citations (1)

Crystal Structures of the Chicken YF1*7.1 molecule

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

MHC Rfp-Y class I alpha 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

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

3p77__assembly_1__model_1

3p77__assembly_1__model_1 | I(q)

3p77__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 (6)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

Entity 2 Entity 2 polymer

Polymer Polymer

Source Source

Entity 3 Entity 3 non-polymer

Entity 4 Entity 4 non-polymer

Entity 5 Entity 5 non-polymer

Entity 6 Entity 6 water

6. Fold Classification (SCOP + CATH) 6 domains

SCOP 2.08 (3 domains)

CATH v4.4 (3 domains)

7. Citations (1)