SAXSdb — 3bt4

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

Fungal protease inhibitor-1

OrganismNot specified

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein monomer	Monomer	Protein 1	GLYCEROL × 1 water × 1	Consistent with protein count
2	Protein homooligomer	Homooligomer	Protein 2	GLYCEROL × 2 water × 2	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	FPI1_ANTMY
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 1–86； UniProt 20–105

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	3bt4
Deposition date deposition_date	2007-12-27
Structure title title	Crystal Structure Analysis of AmFPI-1, fungal protease inhibitor from Antheraea mylitta
Keywords keywords	Protease Inhibitor, Silkworm, Serine protease inhibitor, HYDROLASE 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.

3bt4__assembly_1__model_1

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

Download this curve (.dat)

3bt4__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

3bt4__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	14.97 Å
Rg (electron density)	14.12 Å
Total Rg	15.16 Å
Atom count	633
Residues	85
Excluded volume	11226 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`3bt4__assembly_1__model_1`	monomeric （1）	Success	4.1.3-1-20251215 (887e7ef)	View Download
2	1	`3bt4__assembly_2__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)

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6. Fold Classification (SCOP + CATH) 1 domains

CATH v4.4 (1 domains)

Domain ID domain_id	3bt4A00
Class class	2 — Mainly Beta
Architecture architecture	10 — Ribbon
Topology topology	80 — Lipase, subunit A
Homologous superfamily homologous superfamily	20 —

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Unit-cell length a length_a	60.580 Å
Unit-cell length b length_b	60.580 Å
Unit-cell length c length_c	85.065 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	12

Space group space_group	P 63 2 2
Space-group number int_tables_number	182
Crystal system crystal_system	—

Resolution resolution	2.100 Å
Low-resolution limit resolution_low	24.940 Å
R factor r_factor	0.2507
R_work r_work	0.2487
R_free r_free	0.2931

Description description	Fungal protease inhibitor-1
Molecular weight formula_weight	9294.8 kDa
Source method src_method	nat
Copy count entity_count	1

Polymer type type	polypeptide(L)
Chain IDs strand_id	A
Atom count atom_count	735

Crystal Structure Analysis of AmFPI-1, fungal protease inhibitor from Antheraea mylitta

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

Fungal protease inhibitor-1

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

3bt4__assembly_1__model_1

3bt4__assembly_1__model_1 | I(q)

3bt4__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

Entity 2 Entity 2 non-polymer

Entity 3 Entity 3 water

6. Fold Classification (SCOP + CATH) 1 domains

CATH v4.4 (1 domains)

7. Citations (1)

Description description	GLYCEROL
Molecular weight formula_weight	92.1 kDa
Source method src_method	syn
Copy count entity_count	1

Description description	water
Molecular weight formula_weight	18.0 kDa
Source method src_method	nat
Copy count entity_count	102

Crystal Structure Analysis of AmFPI-1, fungal protease inhibitor from Antheraea mylitta

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

Fungal protease inhibitor-1

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

3bt4__assembly_1__model_1

3bt4__assembly_1__model_1 | I(q)

3bt4__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

Entity 2 Entity 2 non-polymer

Entity 3 Entity 3 water

6. Fold Classification (SCOP + CATH) 1 domains

CATH v4.4 (1 domains)

7. Citations (1)