SAXSdb — 1rbb

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

RIBONUCLEASE B

Bos taurus

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	RNAS1_BOVIN
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 1–124； UniProt 27–150 Author chain B； PDBConstruct 1–124； UniProt 27–150

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	1rbb
Deposition date deposition_date	1987-09-14
Structure title title	THE CRYSTAL STRUCTURE OF RIBONUCLEASE B AT 2.5-ANGSTROMS RESOLUTION
Keywords keywords	HYDROLASE (NUCLEIC ACID, RNA); HYDROLASE (NUCLEIC ACID, RNA)
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.

1rbb__assembly_1__model_1

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

Download this curve (.dat)

1rbb__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

1rbb__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	21.40 Å
Rg (electron density)	20.96 Å
Total Rg	21.63 Å
Atom count	1900
Residues	248
Excluded volume	33146 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`1rbb__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	d1rbba_
Class class	d — Alpha and beta proteins (a+b)
Fold Fold fold	d.5 — RNase A-like
Superfamily Superfamily superfamily	d.5.1 — RNase A-like
Family Family family	d.5.1.1 — Ribonuclease A-like

Domain ID domain_id	d1rbbb_
Class class	d — Alpha and beta proteins (a+b)
Fold Fold fold	d.5 — RNase A-like
Superfamily Superfamily superfamily	d.5.1 — RNase A-like
Family Family family	d.5.1.1 — Ribonuclease A-like

CATH v4.4 (2 domains)

Domain ID domain_id	1rbbA00
Class class	3 — Alpha Beta
Architecture architecture	10 — Roll
Topology topology	130 — P-30 Protein
Homologous superfamily homologous superfamily	10 — Ribonuclease A-like domain

Domain ID domain_id	1rbbB00
Class class	3 — Alpha Beta
Architecture architecture	10 — Roll
Topology topology	130 — P-30 Protein
Homologous superfamily homologous superfamily	10 — Ribonuclease A-like domain

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Unit-cell length a length_a	101.810 Å
Unit-cell length b length_b	33.360 Å
Unit-cell length c length_c	73.600 Å
Unit-cell angle α angle_alpha	90.00 °
Unit-cell angle β angle_beta	90.40 °
Unit-cell angle γ angle_gamma	90.00 °
Molecules per unit cell Z z_pdb	8

Space group space_group	C 1 2 1
Space-group number int_tables_number	5
Crystal system crystal_system	—

Resolution resolution	2.500 Å
Low-resolution limit resolution_low	— Å
R factor r_factor	—
R_work r_work	0.2180
R_free r_free	—

Description description	RIBONUCLEASE B
Molecular weight formula_weight	13708.3 kDa
EC 编号 ec_number	3.1.27.5
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	1900

THE CRYSTAL STRUCTURE OF RIBONUCLEASE B AT 2.5-ANGSTROMS RESOLUTION

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

RIBONUCLEASE B

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

1rbb__assembly_1__model_1

1rbb__assembly_1__model_1 | I(q)

1rbb__assembly_1__model_1 | P(r) · Pending

4. Crystallography and Experiment 4. Crystallography & Experiment

Unit cell Unit Cell

Symmetry Symmetry

Refinement Refinement

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 (2)

Source organism organism	Bos taurus
Common name common_name	cattle
NCBI taxonomy ID ncbi_taxonomy_id	9913

THE CRYSTAL STRUCTURE OF RIBONUCLEASE B AT 2.5-ANGSTROMS RESOLUTION

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

RIBONUCLEASE B

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

1rbb__assembly_1__model_1

1rbb__assembly_1__model_1 | I(q)

1rbb__assembly_1__model_1 | P(r) · Pending

4. Crystallography and Experiment 4. Crystallography & Experiment

Unit cell Unit Cell

Symmetry Symmetry

Refinement Refinement

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 (2)