SAXSdb — 3d4u

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

Carboxypeptidase B2

OrganismNot specified

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein heterocomplex	Heteromer	Protein 2	Carboxypeptidase inhibitor × 1 （Q5EPH2） ZINC ION × 1 ACETATE ION × 2 SULFATE ION × 5 water × 2	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	CBPB2_BOVIN
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 1–309； UniProt 115–423

Carboxypeptidase inhibitor

Rhipicephalus bursa

UniProt Q5EPH2

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein heterocomplex	Heteromer	Protein 2	Carboxypeptidase B2 × 1 （Q2KIG3） ZINC ION × 1 ACETATE ION × 2 SULFATE ION × 5 water × 2	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	TCI1_RHIBU
Isoform	—
PDB entities	2
Chains and sequence ranges	Author chain B； PDBConstruct 1–74； UniProt 23–96

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	3d4u
Deposition date deposition_date	2008-05-15
Structure title title	Bovine thrombin-activatable fibrinolysis inhibitor (TAFIa) in complex with tick-derived carboxypeptidase inhibitor.
Keywords keywords	;protease-inhibitor complex, Carboxypeptidase, Glycoprotein, Hydrolase, Metal-binding, Metalloprotease, Protease, Secreted, Zymogen, Blood coagulation, Fibrinolysis, Metalloenzyme inhibitor, Metalloprotease inhibitor, HYDROLASE-HYDROLASE INHIBITOR COMPLEX ;; HYDROLASE/HYDROLASE INHIBITOR
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.

3d4u__assembly_1__model_1

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

Download this curve (.dat)

3d4u__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

3d4u__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	20.81 Å
Rg (electron density)	19.66 Å
Total Rg	20.68 Å
Atom count	3002
Residues	370
Excluded volume	53069 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`3d4u__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	Carboxypeptidase B2
Molecular weight formula_weight	36029.9 kDa
EC 编号 ec_number	3.4.17.20
Source method src_method	nat
Copy count entity_count	1

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	A
Atom count atom_count	3382

ASSSYYEQYHSLNEIYSWIEVMTERYPDMVEKIHIGSSYEKYPLYVLKVSKKEQRAKNAMWIDCGIHAREWISPAFCLWFVGSVTYYYGKEKMHTNLLKHMDFYIMPVVNVDGYDYTWKKDRMWRKNRSLHEKNACVGTDLNRNFASKHWCGEGASSSSCSEIYCGTYPESEPEVKAVADFLRRNIKHIKAYISMHSYSQKIVFPYSYSRSRSKDHEELSLVAREAVFAMENIHRNIRYTHGSGSESLYLAPGGSDDWIYDLGIKYSFTFELRDKGKYGFLLPESYIRPTCSEALVAVAKIASHVVKNV

Entity 2 Entity 2 polymer

Description description	Carboxypeptidase inhibitor
Molecular weight formula_weight	7807.0 kDa
Source method src_method	man
Copy count entity_count	1

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	B

NECVSKGFGCLPQSDCPQEARLSYGGCSTVCCDLSKLTGCKGKGGECNPLDRQCKELQAESASCGKGQKCCVWL

Source Source

Source organism organism	Rhipicephalus bursa
NCBI taxonomy ID ncbi_taxonomy_id	67831
Host organism host_organism	Escherichia coli

Entity 3 Entity 3 non-polymer

Description description	ZINC ION
Molecular weight formula_weight	65.4 kDa
Source method src_method	syn
Copy count entity_count	1

Entity 4 Entity 4 non-polymer

Description description	ACETATE ION
Molecular weight formula_weight	59.0 kDa
Source method src_method	syn
Copy count entity_count	2

Entity 5 Entity 5 non-polymer

Description description	SULFATE ION
Molecular weight formula_weight	96.1 kDa
Source method src_method	syn
Copy count entity_count	5

Entity 6 Entity 6 water

Description description	water
Molecular weight formula_weight	18.0 kDa
Source method src_method	nat
Copy count entity_count	358

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6. Fold Classification (SCOP + CATH) 6 domains

SCOP 2.08 (3 domains)

Domain ID domain_id	d3d4ua_
Class class	c — Alpha and beta proteins (a/b)
Fold Fold fold	c.56 — Phosphorylase/hydrolase-like
Superfamily Superfamily superfamily	c.56.5 — Zn-dependent exopeptidases
Family Family family	c.56.5.0 — automated matches

Domain ID domain_id	d3d4ub1
Class class	g — Small proteins
Fold Fold fold	g.9 — Defensin-like
Superfamily Superfamily superfamily	g.9.1 — Defensin-like
Family Family family	g.9.1.3 — Tick carboxypeptidase inhibitor-like

Domain ID domain_id	d3d4ub2
Class class	g — Small proteins
Fold Fold fold	g.9 — Defensin-like
Superfamily Superfamily superfamily	g.9.1 — Defensin-like
Family Family family	g.9.1.3 — Tick carboxypeptidase inhibitor-like

CATH v4.4 (3 domains)

Domain ID domain_id	3d4uA00
Class class	3 — Alpha Beta
Architecture architecture	40 — 3-Layer(aba) Sandwich
Topology topology	630 — Aminopeptidase
Homologous superfamily homologous superfamily	10 — Zn peptidases

Domain ID domain_id	3d4uB01
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	1680 — ligand-binding face of the semaphorins, domain 2
Homologous superfamily homologous superfamily	50 — Carboxypeptidase inhibitor, N-terminal domain

Domain ID domain_id	3d4uB02
Class class	2 — Mainly Beta
Architecture architecture	20 — Single Sheet
Topology topology	20 — Anthopleurin-A
Homologous superfamily homologous superfamily	10 — Anthopleurin-A

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Unit-cell length a length_a	84.200 Å
Unit-cell length b length_b	84.200 Å
Unit-cell length c length_c	127.900 Å
Unit-cell angle α angle_alpha	90.00 °
Unit-cell angle β angle_beta	90.00 °
Unit-cell angle γ angle_gamma	120.00 °
Molecules per unit cell Z z_pdb	6

Space group space_group	P 32 2 1
Space-group number int_tables_number	154
Crystal system crystal_system	—

Resolution resolution	1.700 Å
Low-resolution limit resolution_low	48.080 Å
R factor r_factor	0.1561
R_work r_work	0.1559
R_free r_free	0.1707

Bovine thrombin-activatable fibrinolysis inhibitor (TAFIa) in complex with tick-derived carboxypeptidase inhibitor.

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

Carboxypeptidase B2

State in the Current Structure

Other States of the Same Protein in the Database

Carboxypeptidase inhibitor

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

3d4u__assembly_1__model_1

3d4u__assembly_1__model_1 | I(q)

3d4u__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

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 (2)

Bovine thrombin-activatable fibrinolysis inhibitor (TAFIa) in complex with tick-derived carboxypeptidase inhibitor.

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

Carboxypeptidase B2

State in the Current Structure

Other States of the Same Protein in the Database

Monomer

Homodimer

Homotetramer

Other homooligomers

Heteromeric or nucleic-acid complex

Carboxypeptidase inhibitor

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

3d4u__assembly_1__model_1

3d4u__assembly_1__model_1 | I(q)

3d4u__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

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 (2)