2ri4

Crystal Structure determination of Goat Methemoglobin at 2.7 Angstrom

Method: X-RAY DIFFRACTION

▼

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

Hemoglobin subunit alpha-1/2

OrganismNot specified

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein heterocomplex	Heteromer	Protein 4	Hemoglobin subunit beta-A × 2 （P02077） PROTOPORPHYRIN IX CONTAINING FE × 4 water × 4	Consistent with protein count
2	Protein heterocomplex	Heteromer	Protein 4	Hemoglobin subunit beta-A × 2 （P02077） PROTOPORPHYRIN IX CONTAINING FE × 4 water × 4	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	HBA_CAPHI
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 1–141； UniProt 2–142 Author chain C； PDBConstruct 1–141； UniProt 2–142 Author chain I； PDBConstruct 1–141； UniProt 2–142 Author chain K； PDBConstruct 1–141； UniProt 2–142

Hemoglobin subunit beta-A

OrganismNot specified

UniProt P02077

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein heterocomplex	Heteromer	Protein 4	Hemoglobin subunit alpha-1/2 × 2 （P68238） PROTOPORPHYRIN IX CONTAINING FE × 4 water × 4	Consistent with protein count
2	Protein heterocomplex	Heteromer	Protein 4	Hemoglobin subunit alpha-1/2 × 2 （P68238） PROTOPORPHYRIN IX CONTAINING FE × 4 water × 4	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	HBBA_CAPHI
Isoform	—
PDB entities	2
Chains and sequence ranges	Author chain B； PDBConstruct 1–145； UniProt 1–145 Author chain D； PDBConstruct 1–145； UniProt 1–145 Author chain J； PDBConstruct 1–145； UniProt 1–145 Author chain L； PDBConstruct 1–145； UniProt 1–145

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.

▼

2. Structure Basics 2. Structure Basics

Entry ID entry_id	2ri4
Deposition date deposition_date	2007-10-10
Structure title title	Crystal Structure determination of Goat Methemoglobin at 2.7 Angstrom
Keywords keywords	Methemoglobin, low oxygen affinity, Allosteric Mechanism, Heme, Iron, Metal-binding, Transport, Oxygen storage, Oxygen transport; Oxygen storage, Oxygen transport
Experimental Method method	X-RAY DIFFRACTION

▼

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.

2ri4__assembly_2__model_1

Assembly 2 · Model 1 · CRYSOL 4.1.3-1-20251215 (887e7ef)

Download this curve (.dat)

2ri4__assembly_2__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

2ri4__assembly_2__model_1 | P(r) · Pending

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

Rg（Guinier）	24.75 Å
Rg (electron density)	23.39 Å
Total Rg	24.35 Å
Atom count	4479
Residues	564
Excluded volume	80071 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`2ri4__assembly_1__model_1`	tetrameric （4）	Success	4.1.3-1-20251215 (887e7ef)	View Download
2	1	`2ri4__assembly_2__model_1`	tetrameric （4）	Success	4.1.3-1-20251215 (887e7ef)	View Download

▶

4. Crystallography and Experiment 4. Crystallography & Experiment

▶

5. Entities and Polymers Entities & Polymers (4)

Entity 1 Entity 1 polymer

Description description	Hemoglobin subunit alpha-1/2
Molecular weight formula_weight	15056.2 kDa
Source method src_method	nat
Copy count entity_count	4

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	A,C,I,K
Atom count atom_count	8995

VLSAADKSNVKAAWGKVGGNAGAYGAEALERMFLSFPTTKTYFPHFDLSHGSAQVKGHGEKVAAALTKAVGHLDDLPGTLSDLSDLHAHKLRVDPVNFKLLSHSLLVTLACHLPNDFTPAVHASLDKFLANVSTVLTSKYR

Entity 2 Entity 2 polymer

Description description	Hemoglobin subunit beta-A
Molecular weight formula_weight	16046.4 kDa
Source method src_method	nat
Copy count entity_count	4

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	B,D,J,L

MLTAEEKAAVTGFWGKVKVDEVGAEALGRLLVVYPWTQRFFEHFGDLSSADAVMNNAKVKAHGKKVLDSFSNGMKHLDDLKGTFAQLSELHCDKLHVDPENFKLLGNVLVVVLARHHGSEFTPLLQAEFQKVVAGVANALAHRYH

Entity 3 Entity 3 non-polymer

Description description	PROTOPORPHYRIN IX CONTAINING FE
Molecular weight formula_weight	616.5 kDa
Source method src_method	syn
Copy count entity_count	8

Entity 4 Entity 4 water

Description description	water
Molecular weight formula_weight	18.0 kDa
Source method src_method	nat
Copy count entity_count	51

▼

6. Fold Classification (SCOP + CATH) 16 domains

SCOP 2.08 (8 domains)

Domain ID domain_id	d2ri4a_
Class class	a — All alpha proteins
Fold Fold fold	a.1 — Globin-like
Superfamily Superfamily superfamily	a.1.1 — Globin-like
Family Family family	a.1.1.2 — Globins

Domain ID domain_id	d2ri4b_
Class class	a — All alpha proteins
Fold Fold fold	a.1 — Globin-like
Superfamily Superfamily superfamily	a.1.1 — Globin-like
Family Family family	a.1.1.2 — Globins

Domain ID domain_id	d2ri4c_
Class class	a — All alpha proteins
Fold Fold fold	a.1 — Globin-like
Superfamily Superfamily superfamily	a.1.1 — Globin-like
Family Family family	a.1.1.2 — Globins

Domain ID domain_id	d2ri4d_
Class class	a — All alpha proteins
Fold Fold fold	a.1 — Globin-like
Superfamily Superfamily superfamily	a.1.1 — Globin-like
Family Family family	a.1.1.2 — Globins

Domain ID domain_id	d2ri4i_
Class class	a — All alpha proteins
Fold Fold fold	a.1 — Globin-like
Superfamily Superfamily superfamily	a.1.1 — Globin-like
Family Family family	a.1.1.2 — Globins

Domain ID domain_id	d2ri4j_
Class class	a — All alpha proteins
Fold Fold fold	a.1 — Globin-like
Superfamily Superfamily superfamily	a.1.1 — Globin-like
Family Family family	a.1.1.2 — Globins

Domain ID domain_id	d2ri4k_
Class class	a — All alpha proteins
Fold Fold fold	a.1 — Globin-like
Superfamily Superfamily superfamily	a.1.1 — Globin-like
Family Family family	a.1.1.2 — Globins

Domain ID domain_id	d2ri4l_
Class class	a — All alpha proteins
Fold Fold fold	a.1 — Globin-like
Superfamily Superfamily superfamily	a.1.1 — Globin-like
Family Family family	a.1.1.2 — Globins

CATH v4.4 (8 domains)

Domain ID domain_id	2ri4A00
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	490 — Globin-like
Homologous superfamily homologous superfamily	10 — Globins

Domain ID domain_id	2ri4B00
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	490 — Globin-like
Homologous superfamily homologous superfamily	10 — Globins

Domain ID domain_id	2ri4C00
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	490 — Globin-like
Homologous superfamily homologous superfamily	10 — Globins

Domain ID domain_id	2ri4D00
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	490 — Globin-like
Homologous superfamily homologous superfamily	10 — Globins

Domain ID domain_id	2ri4I00
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	490 — Globin-like
Homologous superfamily homologous superfamily	10 — Globins

Domain ID domain_id	2ri4J00
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	490 — Globin-like
Homologous superfamily homologous superfamily	10 — Globins

Domain ID domain_id	2ri4K00
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	490 — Globin-like
Homologous superfamily homologous superfamily	10 — Globins

Domain ID domain_id	2ri4L00
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	490 — Globin-like
Homologous superfamily homologous superfamily	10 — Globins

▶

Unit-cell length a length_a	52.692 Å
Unit-cell length b length_b	68.325 Å
Unit-cell length c length_c	95.597 Å
Unit-cell angle α angle_alpha	110.64 °
Unit-cell angle β angle_beta	91.90 °
Unit-cell angle γ angle_gamma	108.94 °
Molecules per unit cell Z z_pdb	4

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

Resolution resolution	2.700 Å
Low-resolution limit resolution_low	22.500 Å
R factor r_factor	0.2337
R_work r_work	0.2254
R_free r_free	0.3081

Crystal Structure determination of Goat Methemoglobin at 2.7 Angstrom

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

Hemoglobin subunit alpha-1/2

State in the Current Structure

Other States of the Same Protein in the Database

Hemoglobin subunit beta-A

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

2ri4__assembly_2__model_1

2ri4__assembly_2__model_1 | I(q)

2ri4__assembly_2__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 (4)

Entity 1 Entity 1 polymer

Polymer Polymer

Entity 2 Entity 2 polymer

Polymer Polymer

Entity 3 Entity 3 non-polymer

Entity 4 Entity 4 water

6. Fold Classification (SCOP + CATH) 16 domains

SCOP 2.08 (8 domains)

CATH v4.4 (8 domains)

7. Citations (2)

Crystal Structure determination of Goat Methemoglobin at 2.7 Angstrom

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

Hemoglobin subunit alpha-1/2

State in the Current Structure

Other States of the Same Protein in the Database

Monomer

Homodimer

Homotetramer

Other homooligomers

Heteromeric or nucleic-acid complex

Hemoglobin subunit beta-A

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

2ri4__assembly_2__model_1

2ri4__assembly_2__model_1 | I(q)

2ri4__assembly_2__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 (4)

Entity 1 Entity 1 polymer

Polymer Polymer

Entity 2 Entity 2 polymer

Polymer Polymer

Entity 3 Entity 3 non-polymer

Entity 4 Entity 4 water

6. Fold Classification (SCOP + CATH) 16 domains

SCOP 2.08 (8 domains)

CATH v4.4 (8 domains)

7. Citations (2)