SAXSdb — 1b2x

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

PROTEIN (BARNASE)

Bacillus amyloliquefaciens

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein monomer	Monomer	Protein 1	water × 1	Consistent with protein count
2	Protein monomer	Monomer	Protein 1	water × 1	Consistent with protein count
3	Protein monomer	Monomer	Protein 1	ZINC ION × 1 water × 1	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	RNBR_BACAM
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 1–110； UniProt 48–157 Author chain B； PDBConstruct 1–110； UniProt 48–157 Author chain C； PDBConstruct 1–110； UniProt 48–157

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	1b2x
Deposition date deposition_date	1998-12-03
Structure title title	BARNASE WILDTYPE STRUCTURE AT PH 7.5 FROM A CRYO_COOLED CRYSTAL AT 100K
Keywords keywords	MICROBIAL RIBONUCLEASE, ALPHA/BETA PROTEIN, 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.

1b2x__assembly_1__model_1

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

Download this curve (.dat)

1b2x__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

1b2x__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	14.61 Å
Rg (electron density)	13.43 Å
Total Rg	14.69 Å
Atom count	865
Residues	109
Excluded volume	15219 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`1b2x__assembly_1__model_1`	monomeric （1）	Success	4.1.3-1-20251215 (887e7ef)	View Download
2	1	`1b2x__assembly_2__model_1`	monomeric （1）	Success	4.1.3-1-20251215 (887e7ef)	View Download
3	1	`1b2x__assembly_3__model_1`	monomeric （1）	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	PROTEIN (BARNASE)
Molecular weight formula_weight	12398.7 kDa
EC 编号 ec_number	3.1.27.3
Source method src_method	man
Copy count entity_count	3

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	A,B,C
Atom count atom_count	2985

AQVINTFDGVADYLQTYHKLPDNYITKSEAQALGWVASKGNLADVAPGKSIGGDIFSNREGKLPGKSGRTWREADINYTSGFRNSDRILYSSDWLIYKTTDHYQTFTKIR

Source Source

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

Entity 2 Entity 2 non-polymer

Description description	ZINC ION
Molecular weight formula_weight	65.4 kDa
Source method src_method	syn
Copy count entity_count	1

Entity 3 Entity 3 water

Description description	water
Molecular weight formula_weight	18.0 kDa
Source method src_method	nat
Copy count entity_count	380

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6. Fold Classification (SCOP + CATH) 6 domains

SCOP 2.08 (3 domains)

Domain ID domain_id	d1b2xa_
Class class	d — Alpha and beta proteins (a+b)
Fold Fold fold	d.1 — Microbial ribonucleases
Superfamily Superfamily superfamily	d.1.1 — Microbial ribonucleases
Family Family family	d.1.1.2 — Bacterial ribonucleases

Domain ID domain_id	d1b2xb_
Class class	d — Alpha and beta proteins (a+b)
Fold Fold fold	d.1 — Microbial ribonucleases
Superfamily Superfamily superfamily	d.1.1 — Microbial ribonucleases
Family Family family	d.1.1.2 — Bacterial ribonucleases

Domain ID domain_id	d1b2xc_
Class class	d — Alpha and beta proteins (a+b)
Fold Fold fold	d.1 — Microbial ribonucleases
Superfamily Superfamily superfamily	d.1.1 — Microbial ribonucleases
Family Family family	d.1.1.2 — Bacterial ribonucleases

CATH v4.4 (3 domains)

Domain ID domain_id	1b2xA00
Class class	3 — Alpha Beta
Architecture architecture	10 — Roll
Topology topology	450 — Nuclear Transport Factor 2; Chain: A,
Homologous superfamily homologous superfamily	30 — Microbial ribonucleases

Domain ID domain_id	1b2xB00
Class class	3 — Alpha Beta
Architecture architecture	10 — Roll
Topology topology	450 — Nuclear Transport Factor 2; Chain: A,
Homologous superfamily homologous superfamily	30 — Microbial ribonucleases

Domain ID domain_id	1b2xC00
Class class	3 — Alpha Beta
Architecture architecture	10 — Roll
Topology topology	450 — Nuclear Transport Factor 2; Chain: A,
Homologous superfamily homologous superfamily	30 — Microbial ribonucleases

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Unit-cell length a length_a	57.630 Å
Unit-cell length b length_b	57.630 Å
Unit-cell length c length_c	80.980 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	9

Space group space_group	P 32
Space-group number int_tables_number	145
Crystal system crystal_system	—

Resolution resolution	1.800 Å
Low-resolution limit resolution_low	10.800 Å
R factor r_factor	—
R_work r_work	0.1730
R_free r_free	0.2360

BARNASE WILDTYPE STRUCTURE AT PH 7.5 FROM A CRYO_COOLED CRYSTAL AT 100K

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

PROTEIN (BARNASE)

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

1b2x__assembly_1__model_1

1b2x__assembly_1__model_1 | I(q)

1b2x__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) 6 domains

SCOP 2.08 (3 domains)

CATH v4.4 (3 domains)

7. Citations (2)

BARNASE WILDTYPE STRUCTURE AT PH 7.5 FROM A CRYO_COOLED CRYSTAL AT 100K

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

PROTEIN (BARNASE)

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

1b2x__assembly_1__model_1

1b2x__assembly_1__model_1 | I(q)

1b2x__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) 6 domains

SCOP 2.08 (3 domains)

CATH v4.4 (3 domains)

7. Citations (2)