SAXSdb — 1qh2

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

PROTEIN (TRYPSIN INHIBITOR C2)

OrganismNot specified

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein homooligomer	Homooligomer	Protein 2	No other associated polymer	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	Q40378_NICAL
Isoform	—
PDB entities	1, 2
Chains and sequence ranges	Author chain A； PDBConstruct 1–18； UniProt 30–47 Author chain B； PDBConstruct 1–28； UniProt 345–372

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	1qh2
Deposition date deposition_date	1999-05-11
Structure title title	CHYMOTRYPSIN INHIBITOR (C2) FROM NICOTIANA ALATA
Keywords keywords	PROTEINASE INHIBITOR (CHYMOTRYPSIN), SERINE PROTEINASE INHIBITOR, POTATO II TRYPSIN INHIBITOR, NICOTIANA ALATA, HYDROLASE INHIBITOR; HYDROLASE INHIBITOR
Experimental Method method	SOLUTION NMR

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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.

1qh2__assembly_1__model_1

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

Download this curve (.dat)

1qh2__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

1qh2__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	10.61 Å
Rg (electron density)	9.64 Å
Total Rg	11.09 Å
Atom count	671
Residues	46
Excluded volume	6067 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`1qh2__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 (2)

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6. Fold Classification (SCOP + CATH) 1 domains

SCOP 2.08 (1 domains)

Domain ID domain_id	d1qh2.1
Class class	g — Small proteins
Fold Fold fold	g.69 — Plant proteinase inhibitors
Superfamily Superfamily superfamily	g.69.1 — Plant proteinase inhibitors
Family Family family	g.69.1.1 — Plant proteinase inhibitors

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Unit-cell length a length_a	1.000 Å
Unit-cell length b length_b	1.000 Å
Unit-cell length c length_c	1.000 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	1

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

Description description	PROTEIN (TRYPSIN INHIBITOR C2)
Molecular weight formula_weight	1983.4 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	671

Description description	PROTEIN (TRYPSIN INHIBITOR C2)
Molecular weight formula_weight	3040.5 kDa
Source method src_method	nat
Copy count entity_count	1

CHYMOTRYPSIN INHIBITOR (C2) FROM NICOTIANA ALATA

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

PROTEIN (TRYPSIN INHIBITOR C2)

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

1qh2__assembly_1__model_1

1qh2__assembly_1__model_1 | I(q)

1qh2__assembly_1__model_1 | P(r) · Pending

4. Crystallography and Experiment 4. Crystallography & Experiment

Unit cell Unit Cell

Symmetry Symmetry

5. Entities and Polymers Entities & Polymers (2)

Entity 1 Entity 1 polymer

Polymer Polymer

Entity 2 Entity 2 polymer

Polymer Polymer

6. Fold Classification (SCOP + CATH) 1 domains

SCOP 2.08 (1 domains)

7. Citations (2)

CHYMOTRYPSIN INHIBITOR (C2) FROM NICOTIANA ALATA

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

PROTEIN (TRYPSIN INHIBITOR C2)

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

1qh2__assembly_1__model_1

1qh2__assembly_1__model_1 | I(q)

1qh2__assembly_1__model_1 | P(r) · Pending

4. Crystallography and Experiment 4. Crystallography & Experiment

Unit cell Unit Cell

Symmetry Symmetry

5. Entities and Polymers Entities & Polymers (2)

Entity 1 Entity 1 polymer

Polymer Polymer

Entity 2 Entity 2 polymer

Polymer Polymer

6. Fold Classification (SCOP + CATH) 1 domains

SCOP 2.08 (1 domains)

7. Citations (2)