SAXSdb — 1mpe

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

Immunoglobulin G binding protein G

;Streptococcus sp. 'group G' ;

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein homooligomer	Homooligomer	Protein 4	No other associated polymer	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	SPG1_STRSG
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 2–56； UniProt 228–282 Author chain B； PDBConstruct 2–56； UniProt 228–282 Author chain C； PDBConstruct 2–56； UniProt 228–282 Author chain D； PDBConstruct 2–56； UniProt 228–282

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	1mpe
Deposition date deposition_date	2002-09-12
Structure title title	Ensemble of 20 structures of the tetrameric mutant of the B1 domain of streptococcal protein G
Keywords keywords	strand-exchanged tetramer, channel, PROTEIN BINDING; PROTEIN BINDING
Experimental Method method	SOLUTION NMR

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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.

1mpe__assembly_1__model_1

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

Download this curve (.dat)

1mpe__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

1mpe__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	22.31 Å
Rg (electron density)	21.10 Å
Total Rg	22.08 Å
Atom count	3480
Residues	224
Excluded volume	31480 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`1mpe__assembly_1__model_1`	tetrameric （4）	Success	4.1.3-1-20251215 (887e7ef)	View Download
1	2	`1mpe__assembly_1__model_2`	tetrameric （4）	Success	4.1.3-1-20251215 (887e7ef)	View Download
1	3	`1mpe__assembly_1__model_3`	tetrameric （4）	Success	4.1.3-1-20251215 (887e7ef)	View Download
1	4	`1mpe__assembly_1__model_4`	tetrameric （4）	Success	4.1.3-1-20251215 (887e7ef)	View Download
1	5	`1mpe__assembly_1__model_5`	tetrameric （4）	Success	4.1.3-1-20251215 (887e7ef)	View Download
1	6	`1mpe__assembly_1__model_6`	tetrameric （4）	Success	4.1.3-1-20251215 (887e7ef)	View Download
1	7	`1mpe__assembly_1__model_7`	tetrameric （4）	Success	4.1.3-1-20251215 (887e7ef)	View Download
1	8	`1mpe__assembly_1__model_8`	tetrameric （4）	Success	4.1.3-1-20251215 (887e7ef)	View Download
1	9	`1mpe__assembly_1__model_9`	tetrameric （4）	Success	4.1.3-1-20251215 (887e7ef)	View Download
1	10	`1mpe__assembly_1__model_10`	tetrameric （4）	Success	4.1.3-1-20251215 (887e7ef)	View Download
1	11	`1mpe__assembly_1__model_11`	tetrameric （4）	Success	4.1.3-1-20251215 (887e7ef)	View Download
1	12	`1mpe__assembly_1__model_12`	tetrameric （4）	Success	4.1.3-1-20251215 (887e7ef)	View Download
1	13	`1mpe__assembly_1__model_13`	tetrameric （4）	Success	4.1.3-1-20251215 (887e7ef)	View Download
1	14	`1mpe__assembly_1__model_14`	tetrameric （4）	Success	4.1.3-1-20251215 (887e7ef)	View Download
1	15	`1mpe__assembly_1__model_15`	tetrameric （4）	Success	4.1.3-1-20251215 (887e7ef)	View Download
1	16	`1mpe__assembly_1__model_16`	tetrameric （4）	Success	4.1.3-1-20251215 (887e7ef)	View Download
1	17	`1mpe__assembly_1__model_17`	tetrameric （4）	Success	4.1.3-1-20251215 (887e7ef)	View Download
1	18	`1mpe__assembly_1__model_18`	tetrameric （4）	Success	4.1.3-1-20251215 (887e7ef)	View Download
1	19	`1mpe__assembly_1__model_19`	tetrameric （4）	Success	4.1.3-1-20251215 (887e7ef)	View Download
1	20	`1mpe__assembly_1__model_20`	tetrameric （4）	Success	4.1.3-1-20251215 (887e7ef)	View Download
1	21	`1mpe__assembly_1__model_21`	tetrameric （4）	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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6. Fold Classification (SCOP + CATH) 8 domains

SCOP 2.08 (4 domains)

Domain ID domain_id	d1mpea_
Class class	d — Alpha and beta proteins (a+b)
Fold Fold fold	d.15 — beta-Grasp (ubiquitin-like)
Superfamily Superfamily superfamily	d.15.7 — Immunoglobulin-binding domains
Family Family family	d.15.7.1 — Immunoglobulin-binding domains

Domain ID domain_id	d1mpeb_
Class class	d — Alpha and beta proteins (a+b)
Fold Fold fold	d.15 — beta-Grasp (ubiquitin-like)
Superfamily Superfamily superfamily	d.15.7 — Immunoglobulin-binding domains
Family Family family	d.15.7.1 — Immunoglobulin-binding domains

Domain ID domain_id	d1mpec_
Class class	d — Alpha and beta proteins (a+b)
Fold Fold fold	d.15 — beta-Grasp (ubiquitin-like)
Superfamily Superfamily superfamily	d.15.7 — Immunoglobulin-binding domains
Family Family family	d.15.7.1 — Immunoglobulin-binding domains

Domain ID domain_id	d1mped_
Class class	d — Alpha and beta proteins (a+b)
Fold Fold fold	d.15 — beta-Grasp (ubiquitin-like)
Superfamily Superfamily superfamily	d.15.7 — Immunoglobulin-binding domains
Family Family family	d.15.7.1 — Immunoglobulin-binding domains

CATH v4.4 (4 domains)

Domain ID domain_id	1mpeA00
Class class	3 — Alpha Beta
Architecture architecture	10 — Roll
Topology topology	20 — Ubiquitin-like (UB roll)
Homologous superfamily homologous superfamily	10 —

Domain ID domain_id	1mpeB00
Class class	3 — Alpha Beta
Architecture architecture	10 — Roll
Topology topology	20 — Ubiquitin-like (UB roll)
Homologous superfamily homologous superfamily	10 —

Domain ID domain_id	1mpeC00
Class class	3 — Alpha Beta
Architecture architecture	10 — Roll
Topology topology	20 — Ubiquitin-like (UB roll)
Homologous superfamily homologous superfamily	10 —

Domain ID domain_id	1mpeD00
Class class	3 — Alpha Beta
Architecture architecture	10 — Roll
Topology topology	20 — Ubiquitin-like (UB roll)
Homologous superfamily homologous superfamily	10 —

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Unit-cell length a length_a	1.000 Å
Unit-cell length b length_b	1.000 Å
Unit-cell length c length_c	1.000 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	1

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

Description description	Immunoglobulin G binding protein G
Molecular weight formula_weight	6302.9 kDa
Mutation mutation	T2Q, L5V, A26F, F30V, Y33F, A34F
Source method src_method	man
Copy count entity_count	4

Polymer type type	polypeptide(L)
Chain IDs strand_id	A,B,C,D
Atom count atom_count	73080

Source organism organism	;Streptococcus sp. 'group G' ;
NCBI taxonomy ID ncbi_taxonomy_id	1320
Host organism host_organism	Escherichia coli

Ensemble of 20 structures of the tetrameric mutant of the B1 domain of streptococcal protein G

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

Immunoglobulin G binding protein G

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

1mpe__assembly_1__model_1

1mpe__assembly_1__model_1 | I(q)

1mpe__assembly_1__model_1 | P(r) · Pending

4. Crystallography and Experiment 4. Crystallography & Experiment

Unit cell Unit Cell

Symmetry Symmetry

5. Entities and Polymers Entities & Polymers (1)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

6. Fold Classification (SCOP + CATH) 8 domains

SCOP 2.08 (4 domains)

CATH v4.4 (4 domains)

7. Citations (3)

Ensemble of 20 structures of the tetrameric mutant of the B1 domain of streptococcal protein G

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

Immunoglobulin G binding protein G

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

1mpe__assembly_1__model_1

1mpe__assembly_1__model_1 | I(q)

1mpe__assembly_1__model_1 | P(r) · Pending

4. Crystallography and Experiment 4. Crystallography & Experiment

Unit cell Unit Cell

Symmetry Symmetry

5. Entities and Polymers Entities & Polymers (1)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

6. Fold Classification (SCOP + CATH) 8 domains

SCOP 2.08 (4 domains)

CATH v4.4 (4 domains)

7. Citations (3)