SAXSdb — 1a19

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

BARSTAR

Bacillus amyloliquefaciens

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	BARS_BACAM
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 2–90； UniProt 1–89 Author chain B； PDBConstruct 2–90； UniProt 1–89

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	1a19
Deposition date deposition_date	1997-12-25
Structure title title	BARSTAR (FREE), C82A MUTANT
Keywords keywords	BARSTAR, C82A, DIMER, UNCOMPLEXED, RIBONUCLEASE INHIBITOR; RIBONUCLEASE 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.

1a19__assembly_1__model_1

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

Download this curve (.dat)

1a19__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

1a19__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	18.27 Å
Rg (electron density)	17.10 Å
Total Rg	17.93 Å
Atom count	1438
Residues	178
Excluded volume	25670 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`1a19__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 (1)

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6. Fold Classification (SCOP + CATH) 4 domains

SCOP 2.08 (2 domains)

Domain ID domain_id	d1a19a_
Class class	c — Alpha and beta proteins (a/b)
Fold Fold fold	c.9 — Barstar-like
Superfamily Superfamily superfamily	c.9.1 — Barstar-related
Family Family family	c.9.1.1 — Barstar-related

Domain ID domain_id	d1a19b_
Class class	c — Alpha and beta proteins (a/b)
Fold Fold fold	c.9 — Barstar-like
Superfamily Superfamily superfamily	c.9.1 — Barstar-related
Family Family family	c.9.1.1 — Barstar-related

CATH v4.4 (2 domains)

Domain ID domain_id	1a19A00
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	370 — Barnase; Chain D
Homologous superfamily homologous superfamily	10 — Barstar-like

Domain ID domain_id	1a19B00
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	370 — Barnase; Chain D
Homologous superfamily homologous superfamily	10 — Barstar-like

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Unit-cell length a length_a	104.182 Å
Unit-cell length b length_b	104.182 Å
Unit-cell length c length_c	36.000 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	16

Space group space_group	I 41
Space-group number int_tables_number	80
Crystal system crystal_system	—

Resolution resolution	2.760 Å
Low-resolution limit resolution_low	10.000 Å
R factor r_factor	0.2030
R_work r_work	0.2030
R_free r_free	0.2920

Description description	BARSTAR
Molecular weight formula_weight	10320.7 kDa
Mutation mutation	C82A
Source method src_method	man
Copy count entity_count	2

Polymer type type	polypeptide(L)
Chain IDs strand_id	A,B
Atom count atom_count	1438

BARSTAR (FREE), C82A MUTANT

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

BARSTAR

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

1a19__assembly_1__model_1

1a19__assembly_1__model_1 | I(q)

1a19__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 (1)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

6. Fold Classification (SCOP + CATH) 4 domains

SCOP 2.08 (2 domains)

CATH v4.4 (2 domains)

7. Citations (1)

Source organism organism	Bacillus amyloliquefaciens
NCBI taxonomy ID ncbi_taxonomy_id	1390
Host organism host_organism	Escherichia coli

BARSTAR (FREE), C82A MUTANT

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

BARSTAR

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

1a19__assembly_1__model_1

1a19__assembly_1__model_1 | I(q)

1a19__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 (1)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

6. Fold Classification (SCOP + CATH) 4 domains

SCOP 2.08 (2 domains)

CATH v4.4 (2 domains)

7. Citations (1)