SAXSdb — 1cho

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

ALPHA-CHYMOTRYPSIN A

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	TURKEY OVOMUCOID THIRD DOMAIN (OMTKY3) × 1 （P68390） water × 4	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	CTRA_BOVIN
Isoform	—
PDB entities	1, 2, 3
Chains and sequence ranges	Author chain E； PDBConstruct 1–13； UniProt 1–13 Author chain F； PDBConstruct 1–131； UniProt 16–146 Author chain G； PDBConstruct 1–97； UniProt 149–245

TURKEY OVOMUCOID THIRD DOMAIN (OMTKY3)

OrganismNot specified

UniProt P68390

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein heterocomplex	Heteromer	Protein 4	ALPHA-CHYMOTRYPSIN A × 1 （P00766） ALPHA-CHYMOTRYPSIN A × 1 （P00766） ALPHA-CHYMOTRYPSIN A × 1 （P00766） water × 4	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	IOVO_MELGA
Isoform	—
PDB entities	4
Chains and sequence ranges	Author chain I； PDBConstruct 1–56； UniProt 130–185

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	1cho
Deposition date deposition_date	1988-03-04
Structure title title	CRYSTAL AND MOLECULAR STRUCTURES OF THE COMPLEX OF ALPHA-*CHYMOTRYPSIN WITH ITS INHIBITOR TURKEY OVOMUCOID THIRD DOMAIN AT 1.8 ANGSTROMS RESOLUTION
Keywords keywords	SERINE PROTEINASE-INHIBITOR COMPLEX, 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.

1cho__assembly_1__model_1

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

Download this curve (.dat)

1cho__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

1cho__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	19.02 Å
Rg (electron density)	17.94 Å
Total Rg	18.92 Å
Atom count	2150
Residues	291
Excluded volume	38199 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`1cho__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 (5)

Entity 1 Entity 1 polymer

Description description	ALPHA-CHYMOTRYPSIN A
Molecular weight formula_weight	1253.5 kDa
EC 编号 ec_number	3.4.21.1
Source method src_method	nat
Copy count entity_count	1

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	E
Atom count atom_count	2371

CGVPAIQPVLSGL

Entity 2 Entity 2 polymer

Description description	ALPHA-CHYMOTRYPSIN A
Molecular weight formula_weight	13934.6 kDa
EC 编号 ec_number	3.4.21.1
Source method src_method	nat
Copy count entity_count	1

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	F

IVNGEEAVPGSWPWQVSLQDKTGFHFCGGSLINENWVVTAAHCGVTTSDVVVAGEFDQGSSSEKIQKLKIAKVFKNSKYNSLTINNDITLLKLSTAASFSQTVSAVCLPSASDDFAAGTTCVTTGWGLTRY

Entity 3 Entity 3 polymer

Description description	ALPHA-CHYMOTRYPSIN A
Molecular weight formula_weight	10074.5 kDa
EC 编号 ec_number	3.4.21.1
Source method src_method	nat
Copy count entity_count	1

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	G

ANTPDRLQQASLPLLSNTNCKKYWGTKIKDAMICAGASGVSSCMGDSGGPLVCKKNGAWTLVGIVSWGSSTCSTSTPGVYARVTALVNWVQQTLAAN

Entity 4 Entity 4 polymer

Description description	TURKEY OVOMUCOID THIRD DOMAIN (OMTKY3)
Molecular weight formula_weight	6026.8 kDa
Source method src_method	nat
Copy count entity_count	1

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	I

LAAVSVDCSEYPKPACTLEYRPLCGSDNKTYGNKCNFCNAVVESNGTLTLSHFGKC

Entity 5 Entity 5 water

Description description	water
Molecular weight formula_weight	18.0 kDa
Source method src_method	nat
Copy count entity_count	221

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6. Fold Classification (SCOP + CATH) 5 domains

SCOP 2.08 (2 domains)

Domain ID domain_id	d1cho.1
Class class	b — All beta proteins
Fold Fold fold	b.47 — Trypsin-like serine proteases
Superfamily Superfamily superfamily	b.47.1 — Trypsin-like serine proteases
Family Family family	b.47.1.2 — Eukaryotic proteases

Domain ID domain_id	d1choi_
Class class	g — Small proteins
Fold Fold fold	g.68 — Kazal-type serine protease inhibitors
Superfamily Superfamily superfamily	g.68.1 — Kazal-type serine protease inhibitors
Family Family family	g.68.1.1 — Ovomucoid domain III-like

CATH v4.4 (3 domains)

Domain ID domain_id	1choF00
Class class	2 — Mainly Beta
Architecture architecture	40 — Beta Barrel
Topology topology	10 — Thrombin, subunit H
Homologous superfamily homologous superfamily	10 — Trypsin-like serine proteases

Domain ID domain_id	1choG00
Class class	2 — Mainly Beta
Architecture architecture	40 — Beta Barrel
Topology topology	10 — Thrombin, subunit H
Homologous superfamily homologous superfamily	10 — Trypsin-like serine proteases

Domain ID domain_id	1choI00
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	60 — Wheat Germ Agglutinin (Isolectin 2); domain 1
Homologous superfamily homologous superfamily	30 —

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Unit-cell length a length_a	44.920 Å
Unit-cell length b length_b	54.520 Å
Unit-cell length c length_c	57.180 Å
Unit-cell angle α angle_alpha	90.00 °
Unit-cell angle β angle_beta	103.90 °
Unit-cell angle γ angle_gamma	90.00 °
Molecules per unit cell Z z_pdb	2

Space group space_group	P 1 21 1
Space-group number int_tables_number	4
Crystal system crystal_system	—

Resolution resolution	1.800 Å
Low-resolution limit resolution_low	8.000 Å
R factor r_factor	0.1680
R_work r_work	—
R_free r_free	—

CRYSTAL AND MOLECULAR STRUCTURES OF THE COMPLEX OF ALPHA-*CHYMOTRYPSIN WITH ITS INHIBITOR TURKEY OVOMUCOID THIRD DOMAIN AT 1.8 ANGSTROMS RESOLUTION

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

ALPHA-CHYMOTRYPSIN A

State in the Current Structure

Other States of the Same Protein in the Database

TURKEY OVOMUCOID THIRD DOMAIN (OMTKY3)

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

1cho__assembly_1__model_1

1cho__assembly_1__model_1 | I(q)

1cho__assembly_1__model_1 | P(r) · Pending

4. Crystallography and Experiment 4. Crystallography & Experiment

Unit cell Unit Cell

Symmetry Symmetry

Refinement Refinement

5. Entities and Polymers Entities & Polymers (5)

Entity 1 Entity 1 polymer

Polymer Polymer

Entity 2 Entity 2 polymer

Polymer Polymer

Entity 3 Entity 3 polymer

Polymer Polymer

Entity 4 Entity 4 polymer

Polymer Polymer

Entity 5 Entity 5 water

6. Fold Classification (SCOP + CATH) 5 domains

SCOP 2.08 (2 domains)

CATH v4.4 (3 domains)

7. Citations (1)

CRYSTAL AND MOLECULAR STRUCTURES OF THE COMPLEX OF ALPHA-*CHYMOTRYPSIN WITH ITS INHIBITOR TURKEY OVOMUCOID THIRD DOMAIN AT 1.8 ANGSTROMS RESOLUTION

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

ALPHA-CHYMOTRYPSIN 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

TURKEY OVOMUCOID THIRD DOMAIN (OMTKY3)

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

1cho__assembly_1__model_1

1cho__assembly_1__model_1 | I(q)

1cho__assembly_1__model_1 | P(r) · Pending

4. Crystallography and Experiment 4. Crystallography & Experiment

Unit cell Unit Cell

Symmetry Symmetry

Refinement Refinement

5. Entities and Polymers Entities & Polymers (5)

Entity 1 Entity 1 polymer

Polymer Polymer

Entity 2 Entity 2 polymer

Polymer Polymer

Entity 3 Entity 3 polymer

Polymer Polymer

Entity 4 Entity 4 polymer

Polymer Polymer

Entity 5 Entity 5 water

6. Fold Classification (SCOP + CATH) 5 domains

SCOP 2.08 (2 domains)

CATH v4.4 (3 domains)

7. Citations (1)