SAXSdb — 1lw6

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

;SUBTILISIN BPN' ;

Bacillus amyloliquefaciens

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein heterocomplex	Heteromer	Protein 2	SUBTILISIN-CHYMOTRYPSIN INHIBITOR-2A × 1 （P01053） CALCIUM ION × 1 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	SUBT_BACAM
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain E； PDBConstruct 1–275； UniProt 108–382

SUBTILISIN-CHYMOTRYPSIN INHIBITOR-2A

Hordeum vulgare

UniProt P01053

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein heterocomplex	Heteromer	Protein 2	;SUBTILISIN BPN' ; × 1 （P00782） CALCIUM ION × 1 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	ICI2_HORVU
Isoform	—
PDB entities	2
Chains and sequence ranges	Author chain I； PDBConstruct 2–64； UniProt 21–83

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	1lw6
Deposition date deposition_date	2002-05-30
Structure title title	Crystal Structure of the Complex of Subtilisin BPN' with Chymotrypsin Inhibitor 2 at 1.5 Angstrom Resolution
Keywords keywords	SERINE PROTEASE, INHIBITOR, HYDROLASE; HYDROLASE
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.

1lw6__assembly_1__model_1

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

Download this curve (.dat)

1lw6__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

1lw6__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	20.27 Å
Rg (electron density)	19.30 Å
Total Rg	20.20 Å
Atom count	2520
Residues	344
Excluded volume	44483 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`1lw6__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 (5)

Entity 1 Entity 1 polymer

Description description	;SUBTILISIN BPN' ;
Molecular weight formula_weight	28381.4 kDa
EC 编号 ec_number	3.4.21.62
Source method src_method	man
Copy count entity_count	1

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	E
Atom count atom_count	3049

AQSVPYGVSQIKAPALHSQGYTGSNVKVAVIDSGIDSSHPDLKVAGGASMVPSETNPFQDNNSHGTHVAGTVAALNNSIGVLGVAPSASLYAVKVLGADGSGQYSWIINGIEWAIANNMDVINMSLGGPSGSAALKAAVDKAVASGVVVVAAAGNEGTSGSSSTVGYPGKYPSVIAVGAVDSSNQRASFSSVGPELDVMAPGVSIQSTLPGNKYGAYNGTSMASPHVAGAAALILSKHPNWTNTQVRSSLENTTTKLGDSFYYGKGLINVQAAAQHHHHHH

Source Source

Source organism organism	Bacillus amyloliquefaciens
NCBI taxonomy ID ncbi_taxonomy_id	1390
Host organism host_organism	Bacillus subtilis

Entity 2 Entity 2 polymer

Description description	SUBTILISIN-CHYMOTRYPSIN INHIBITOR-2A
Molecular weight formula_weight	7255.6 kDa
Mutation mutation	E45A
Source method src_method	man
Copy count entity_count	1

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	I

MKTEWPELVGKSVEEAKKVILQDKPAAQIIVLPVGTIVTMEYRIDRVRLFVDKLDNIAQVPRVG

Source Source

Source organism organism	Hordeum vulgare
NCBI taxonomy ID ncbi_taxonomy_id	4513
Host organism host_organism	Escherichia coli BL21(DE3)

Entity 3 Entity 3 non-polymer

Description description	CALCIUM ION
Molecular weight formula_weight	40.1 kDa
Source method src_method	syn
Copy count entity_count	1

Entity 4 Entity 4 non-polymer

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

Entity 5 Entity 5 water

Description description	water
Molecular weight formula_weight	18.0 kDa
Source method src_method	nat
Copy count entity_count	505

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6. Fold Classification (SCOP + CATH) 5 domains

SCOP 2.08 (3 domains)

Domain ID domain_id	d1lw6e1
Class class	c — Alpha and beta proteins (a/b)
Fold Fold fold	c.41 — Subtilisin-like
Superfamily Superfamily superfamily	c.41.1 — Subtilisin-like
Family Family family	c.41.1.1 — Subtilases

Domain ID domain_id	d1lw6e2
Class class	l — Artifacts
Fold Fold fold	l.1 — Tags
Superfamily Superfamily superfamily	l.1.1 — Tags
Family Family family	l.1.1.1 — Tags

Domain ID domain_id	d1lw6i_
Class class	d — Alpha and beta proteins (a+b)
Fold Fold fold	d.40 — CI-2 family of serine protease inhibitors
Superfamily Superfamily superfamily	d.40.1 — CI-2 family of serine protease inhibitors
Family Family family	d.40.1.1 — CI-2 family of serine protease inhibitors

CATH v4.4 (2 domains)

Domain ID domain_id	1lw6E00
Class class	3 — Alpha Beta
Architecture architecture	40 — 3-Layer(aba) Sandwich
Topology topology	50 — Rossmann fold
Homologous superfamily homologous superfamily	200 — Peptidase S8/S53 domain

Domain ID domain_id	1lw6I00
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	10 — Trypsin Inhibitor V; Chain A
Homologous superfamily homologous superfamily	10 — Trypsin Inhibitor V, subunit A

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Unit-cell length a length_a	54.332 Å
Unit-cell length b length_b	56.597 Å
Unit-cell length c length_c	118.635 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	4

Space group space_group	P 21 21 21
Space-group number int_tables_number	19
Crystal system crystal_system	—

Resolution resolution	1.500 Å
Low-resolution limit resolution_low	29.660 Å
R factor r_factor	0.1700
R_work r_work	0.1690
R_free r_free	0.1880

Crystal Structure of the Complex of Subtilisin BPN' with Chymotrypsin Inhibitor 2 at 1.5 Angstrom Resolution

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

;SUBTILISIN BPN' ;

State in the Current Structure

Other States of the Same Protein in the Database

SUBTILISIN-CHYMOTRYPSIN INHIBITOR-2A

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

1lw6__assembly_1__model_1

1lw6__assembly_1__model_1 | I(q)

1lw6__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 (5)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

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 water

6. Fold Classification (SCOP + CATH) 5 domains

SCOP 2.08 (3 domains)

CATH v4.4 (2 domains)

7. Citations (1)

Crystal Structure of the Complex of Subtilisin BPN' with Chymotrypsin Inhibitor 2 at 1.5 Angstrom Resolution

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

;SUBTILISIN BPN' ;

State in the Current Structure

Other States of the Same Protein in the Database

Monomer

Homodimer

Homotetramer

Other homooligomers

Heteromeric or nucleic-acid complex

SUBTILISIN-CHYMOTRYPSIN INHIBITOR-2A

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

1lw6__assembly_1__model_1

1lw6__assembly_1__model_1 | I(q)

1lw6__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 (5)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

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 water

6. Fold Classification (SCOP + CATH) 5 domains

SCOP 2.08 (3 domains)

CATH v4.4 (2 domains)

7. Citations (1)