SAXSdb — 1c4p

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

PROTEIN (STREPTOKINASE)

Streptococcus dysgalactiae subsp. equisimilis

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein homooligomer	Homooligomer	Protein 4	water × 4	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	Q53284_STREQ
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 1–137； UniProt 149–285 Author chain B； PDBConstruct 1–137； UniProt 149–285 Author chain C； PDBConstruct 1–137； UniProt 149–285 Author chain D； PDBConstruct 1–137； UniProt 149–285

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	1c4p
Deposition date deposition_date	1999-09-15
Structure title title	BETA DOMAIN OF STREPTOKINASE
Keywords keywords	PLASMINOGEN ACTIVATOR, BLOOD CLOTTING; BLOOD CLOTTING
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.

1c4p__assembly_1__model_1

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

Download this curve (.dat)

1c4p__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

1c4p__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	26.94 Å
Rg (electron density)	26.08 Å
Total Rg	26.91 Å
Atom count	4350
Residues	538
Excluded volume	77254 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`1c4p__assembly_1__model_1`	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 (2)

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6. Fold Classification (SCOP + CATH) 8 domains

SCOP 2.08 (4 domains)

Domain ID domain_id	d1c4pa_
Class class	d — Alpha and beta proteins (a+b)
Fold Fold fold	d.15 — beta-Grasp (ubiquitin-like)
Superfamily Superfamily superfamily	d.15.5 — Staphylokinase/streptokinase
Family Family family	d.15.5.1 — Staphylokinase/streptokinase

Domain ID domain_id	d1c4pb_
Class class	d — Alpha and beta proteins (a+b)
Fold Fold fold	d.15 — beta-Grasp (ubiquitin-like)
Superfamily Superfamily superfamily	d.15.5 — Staphylokinase/streptokinase
Family Family family	d.15.5.1 — Staphylokinase/streptokinase

Domain ID domain_id	d1c4pc_
Class class	d — Alpha and beta proteins (a+b)
Fold Fold fold	d.15 — beta-Grasp (ubiquitin-like)
Superfamily Superfamily superfamily	d.15.5 — Staphylokinase/streptokinase
Family Family family	d.15.5.1 — Staphylokinase/streptokinase

Domain ID domain_id	d1c4pd_
Class class	d — Alpha and beta proteins (a+b)
Fold Fold fold	d.15 — beta-Grasp (ubiquitin-like)
Superfamily Superfamily superfamily	d.15.5 — Staphylokinase/streptokinase
Family Family family	d.15.5.1 — Staphylokinase/streptokinase

CATH v4.4 (4 domains)

Domain ID domain_id	1c4pA00
Class class	3 — Alpha Beta
Architecture architecture	10 — Roll
Topology topology	20 — Ubiquitin-like (UB roll)
Homologous superfamily homologous superfamily	180 —

Domain ID domain_id	1c4pB00
Class class	3 — Alpha Beta
Architecture architecture	10 — Roll
Topology topology	20 — Ubiquitin-like (UB roll)
Homologous superfamily homologous superfamily	180 —

Domain ID domain_id	1c4pC00
Class class	3 — Alpha Beta
Architecture architecture	10 — Roll
Topology topology	20 — Ubiquitin-like (UB roll)
Homologous superfamily homologous superfamily	180 —

Domain ID domain_id	1c4pD00
Class class	3 — Alpha Beta
Architecture architecture	10 — Roll
Topology topology	20 — Ubiquitin-like (UB roll)
Homologous superfamily homologous superfamily	180 —

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Unit-cell length a length_a	73.970 Å
Unit-cell length b length_b	83.990 Å
Unit-cell length c length_c	97.220 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	16

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

Resolution resolution	2.400 Å
Low-resolution limit resolution_low	20.000 Å
R factor r_factor	0.2370
R_work r_work	0.2370
R_free r_free	0.3040

Description description	PROTEIN (STREPTOKINASE)
Molecular weight formula_weight	15830.7 kDa
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	4471

BETA DOMAIN OF STREPTOKINASE

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

PROTEIN (STREPTOKINASE)

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

1c4p__assembly_1__model_1

1c4p__assembly_1__model_1 | I(q)

1c4p__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 (2)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

Entity 2 Entity 2 water

6. Fold Classification (SCOP + CATH) 8 domains

SCOP 2.08 (4 domains)

CATH v4.4 (4 domains)

7. Citations (1)

Source organism organism	Streptococcus dysgalactiae subsp. equisimilis
NCBI taxonomy ID ncbi_taxonomy_id	119602
Host organism host_organism	Escherichia coli BL21

Description description	water
Molecular weight formula_weight	18.0 kDa
Source method src_method	nat
Copy count entity_count	121

BETA DOMAIN OF STREPTOKINASE

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

PROTEIN (STREPTOKINASE)

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

1c4p__assembly_1__model_1

1c4p__assembly_1__model_1 | I(q)

1c4p__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 (2)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

Entity 2 Entity 2 water

6. Fold Classification (SCOP + CATH) 8 domains

SCOP 2.08 (4 domains)

CATH v4.4 (4 domains)

7. Citations (1)