SAXSdb — 5hyt

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

Precursor to Protein Sir22

Streptococcus pyogenes

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein heterocomplex	Heteromer	Protein 4	C4b-binding protein alpha chain × 2 （P04003） water × 4	Consistent with protein count
2	Protein heterocomplex	Heteromer	Protein 4	C4b-binding protein alpha chain × 2 （P04003） water × 4	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	Q54901_STRPY
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 5–83； UniProt 48–126 Author chain C； PDBConstruct 5–83； UniProt 48–126 Author chain E； PDBConstruct 5–83； UniProt 48–126 Author chain G； PDBConstruct 5–83； UniProt 48–126

C4b-binding protein alpha chain

Homo sapiens

UniProt P04003

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein heterocomplex	Heteromer	Protein 4	Precursor to Protein Sir22 × 2 （Q54901） water × 4	Consistent with protein count
2	Protein heterocomplex	Heteromer	Protein 4	Precursor to Protein Sir22 × 2 （Q54901） water × 4	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	C4BPA_HUMAN
Isoform	—
PDB entities	2
Chains and sequence ranges	Author chain B； PDBConstruct 5–128； UniProt 49–172 Author chain D； PDBConstruct 5–128； UniProt 49–172 Author chain F； PDBConstruct 5–128； UniProt 49–172 Author chain H； PDBConstruct 5–128； UniProt 49–172

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	5hyt
Deposition date deposition_date	2016-02-01
Structure title title	Structure of human C4b-binidng protein alpha chain CCP domains 1 and 2 in complex with the hypervariable region of group A Streptococcus M22 protein
Keywords keywords	M protein, Complement, Streptococcus pyogenes, hypervariable 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.

5hyt__assembly_1__model_1

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

Download this curve (.dat)

5hyt__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

5hyt__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	25.41 Å
Rg (electron density)	24.82 Å
Total Rg	25.57 Å
Atom count	2422
Residues	306
Excluded volume	42715 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`5hyt__assembly_1__model_1`	tetrameric （4）	Success	4.1.3-1-20251215 (887e7ef)	View Download
2	1	`5hyt__assembly_2__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 (3)

Entity 1 Entity 1 polymer

Description description	Precursor to Protein Sir22
Molecular weight formula_weight	9865.8 kDa
Source method src_method	man
Copy count entity_count	4

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	A,C,G,E
Atom count atom_count	4914

GPGSESSNISQESKLINTLTDENEKLREELQQYYALSDAKEEEPRYKALRGENQDLREKERKYQDKIKKLEEKEKNLEKKSED

Source Source

Source organism organism	Streptococcus pyogenes
NCBI taxonomy ID ncbi_taxonomy_id	1314
Host organism host_organism	Escherichia coli

Entity 2 Entity 2 polymer

Description description	C4b-binding protein alpha chain
Molecular weight formula_weight	14163.9 kDa
Source method src_method	man
Copy count entity_count	4

Polymer Polymer

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

GPGSNCGPPPTLSFAAPMDITLTETRFKTGTTLKYTCLPGYVRSHSTQTLTCNSDGEWVYNTFCIYKRCRHPGELRNGQVEIKTDLSFGSQIEFSCSEGFFLIGSTTSRCEVQDRGVGWSHPLPQCEI

Source Source

Source organism organism	Homo sapiens
Common name common_name	Human
NCBI taxonomy ID ncbi_taxonomy_id	9606
Host organism host_organism	Escherichia coli

Entity 3 Entity 3 water

Description description	water
Molecular weight formula_weight	18.0 kDa
Source method src_method	nat
Copy count entity_count	70

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6. Fold Classification (SCOP + CATH) 8 domains

CATH v4.4 (8 domains)

Domain ID domain_id	5hytB01
Class class	2 — Mainly Beta
Architecture architecture	10 — Ribbon
Topology topology	70 — Complement Module; domain 1
Homologous superfamily homologous superfamily	10 — Complement Module, domain 1

Domain ID domain_id	5hytB02
Class class	2 — Mainly Beta
Architecture architecture	10 — Ribbon
Topology topology	70 — Complement Module; domain 1
Homologous superfamily homologous superfamily	10 — Complement Module, domain 1

Domain ID domain_id	5hytD01
Class class	2 — Mainly Beta
Architecture architecture	10 — Ribbon
Topology topology	70 — Complement Module; domain 1
Homologous superfamily homologous superfamily	10 — Complement Module, domain 1

Domain ID domain_id	5hytD02
Class class	2 — Mainly Beta
Architecture architecture	10 — Ribbon
Topology topology	70 — Complement Module; domain 1
Homologous superfamily homologous superfamily	10 — Complement Module, domain 1

Domain ID domain_id	5hytF01
Class class	2 — Mainly Beta
Architecture architecture	10 — Ribbon
Topology topology	70 — Complement Module; domain 1
Homologous superfamily homologous superfamily	10 — Complement Module, domain 1

Domain ID domain_id	5hytF02
Class class	2 — Mainly Beta
Architecture architecture	10 — Ribbon
Topology topology	70 — Complement Module; domain 1
Homologous superfamily homologous superfamily	10 — Complement Module, domain 1

Domain ID domain_id	5hytH01
Class class	2 — Mainly Beta
Architecture architecture	10 — Ribbon
Topology topology	70 — Complement Module; domain 1
Homologous superfamily homologous superfamily	10 — Complement Module, domain 1

Domain ID domain_id	5hytH02
Class class	2 — Mainly Beta
Architecture architecture	10 — Ribbon
Topology topology	70 — Complement Module; domain 1
Homologous superfamily homologous superfamily	10 — Complement Module, domain 1

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Unit-cell length a length_a	68.079 Å
Unit-cell length b length_b	80.348 Å
Unit-cell length c length_c	152.940 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	2.540 Å
Low-resolution limit resolution_low	76.470 Å
R factor r_factor	0.2178
R_work r_work	0.2134
R_free r_free	0.2744

Structure of human C4b-binidng protein alpha chain CCP domains 1 and 2 in complex with the hypervariable region of group A Streptococcus M22 protein

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

Precursor to Protein Sir22

State in the Current Structure

Other States of the Same Protein in the Database

C4b-binding protein alpha chain

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

5hyt__assembly_1__model_1

5hyt__assembly_1__model_1 | I(q)

5hyt__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 (3)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

Entity 2 Entity 2 polymer

Polymer Polymer

Source Source

Entity 3 Entity 3 water

6. Fold Classification (SCOP + CATH) 8 domains

CATH v4.4 (8 domains)

7. Citations (1)

Structure of human C4b-binidng protein alpha chain CCP domains 1 and 2 in complex with the hypervariable region of group A Streptococcus M22 protein

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

Precursor to Protein Sir22

State in the Current Structure

Other States of the Same Protein in the Database

Monomer

Homodimer

Homotetramer

Other homooligomers

Heteromeric or nucleic-acid complex

C4b-binding protein 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

2. Structure Basics 2. Structure Basics

3. Official assembly/model SAXS Official SAXS Profiles

5hyt__assembly_1__model_1

5hyt__assembly_1__model_1 | I(q)

5hyt__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 (3)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

Entity 2 Entity 2 polymer

Polymer Polymer

Source Source

Entity 3 Entity 3 water

6. Fold Classification (SCOP + CATH) 8 domains

CATH v4.4 (8 domains)

7. Citations (1)