SAXSdb — 2zjx

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

Pancreatic trypsin inhibitor

Bos taurus

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein homooligomer	Homooligomer	Protein 2	SULFATE ION × 4 water × 2	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	BPT1_BOVIN
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 1–58； UniProt 36–93 Author chain B； PDBConstruct 1–58； UniProt 36–93

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	2zjx
Deposition date deposition_date	2008-03-11
Structure title title	Bovine pancreatic trypsin inhibitor (BPTI) containing only the [5,55] disulfide bond
Keywords keywords	;sequence simplification, HYDROLASE INHIBITOR, Disulfide bond, Pharmaceutical, Protease inhibitor, Secreted, Serine protease inhibitor ;; 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.

2zjx__assembly_1__model_1

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

Download this curve (.dat)

2zjx__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

2zjx__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	15.51 Å
Rg (electron density)	14.92 Å
Total Rg	15.97 Å
Atom count	907
Residues	115
Excluded volume	15871 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`2zjx__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 (3)

Entity 1 Entity 1 polymer

Description description	Pancreatic trypsin inhibitor
Molecular weight formula_weight	6367.2 kDa
Mutation mutation	C14G, C30A, C38A, C51A, M52L
Source method src_method	man
Copy count entity_count	2

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	A,B
Atom count atom_count	1054

RPDFCLEPPYTGPGKARIIRYFYNAKAGLAQTFVYGGARAKRNNFKSAEDALRTCGGA

Source Source

Source organism organism	Bos taurus
Common name common_name	bovine
NCBI taxonomy ID ncbi_taxonomy_id	9913
Host organism host_organism	Escherichia coli

Entity 2 Entity 2 non-polymer

Description description	SULFATE ION
Molecular weight formula_weight	96.1 kDa
Source method src_method	syn
Copy count entity_count	4

Entity 3 Entity 3 water

Description description	water
Molecular weight formula_weight	18.0 kDa
Source method src_method	nat
Copy count entity_count	139

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6. Fold Classification (SCOP + CATH) 4 domains

SCOP 2.08 (2 domains)

Domain ID domain_id	d2zjxa_
Class class	g — Small proteins
Fold Fold fold	g.8 — BPTI-like
Superfamily Superfamily superfamily	g.8.1 — BPTI-like
Family Family family	g.8.1.1 — Small Kunitz-type inhibitors & BPTI-like toxins

Domain ID domain_id	d2zjxb_
Class class	g — Small proteins
Fold Fold fold	g.8 — BPTI-like
Superfamily Superfamily superfamily	g.8.1 — BPTI-like
Family Family family	g.8.1.1 — Small Kunitz-type inhibitors & BPTI-like toxins

CATH v4.4 (2 domains)

Domain ID domain_id	2zjxA00
Class class	4 — Few Secondary Structures
Architecture architecture	10 — Irregular
Topology topology	410 — Factor Xa Inhibitor
Homologous superfamily homologous superfamily	10 — Pancreatic trypsin inhibitor Kunitz domain

Domain ID domain_id	2zjxB00
Class class	4 — Few Secondary Structures
Architecture architecture	10 — Irregular
Topology topology	410 — Factor Xa Inhibitor
Homologous superfamily homologous superfamily	10 — Pancreatic trypsin inhibitor Kunitz domain

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Unit-cell length a length_a	25.065 Å
Unit-cell length b length_b	40.792 Å
Unit-cell length c length_c	54.879 Å
Unit-cell angle α angle_alpha	90.00 °
Unit-cell angle β angle_beta	100.93 °
Unit-cell angle γ angle_gamma	90.00 °
Molecules per unit cell Z z_pdb	4

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

Resolution resolution	1.090 Å
Low-resolution limit resolution_low	26.940 Å
R factor r_factor	0.1831
R_work r_work	—
R_free r_free	0.2090

Bovine pancreatic trypsin inhibitor (BPTI) containing only the [5,55] disulfide bond

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

Pancreatic trypsin 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

2zjx__assembly_1__model_1

2zjx__assembly_1__model_1 | I(q)

2zjx__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 non-polymer

Entity 3 Entity 3 water

6. Fold Classification (SCOP + CATH) 4 domains

SCOP 2.08 (2 domains)

CATH v4.4 (2 domains)

7. Citations (1)

Bovine pancreatic trypsin inhibitor (BPTI) containing only the [5,55] disulfide bond

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

Pancreatic trypsin 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

2zjx__assembly_1__model_1

2zjx__assembly_1__model_1 | I(q)

2zjx__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 non-polymer

Entity 3 Entity 3 water

6. Fold Classification (SCOP + CATH) 4 domains

SCOP 2.08 (2 domains)

CATH v4.4 (2 domains)

7. Citations (1)