SAXSdb — 1bsr

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

BOVINE SEMINAL RIBONUCLEASE

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	SULFATE ION × 7 water × 2	Consistent with protein count
2	Protein homooligomer	Homooligomer	Protein 4	SULFATE ION × 14 water × 4	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	RNS_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	1bsr
Deposition date deposition_date	1993-04-28
Structure title title	BOVINE SEMINAL RIBONUCLEASE STRUCTURE AT 1.9 ANGSTROMS RESOLUTION
Keywords keywords	HYDROLASE(PHOSPHORIC DIESTER, RNA); HYDROLASE(PHOSPHORIC DIESTER,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.

1bsr__assembly_1__model_1

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

Download this curve (.dat)

1bsr__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

1bsr__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	21.16 Å
Rg (electron density)	21.16 Å
Total Rg	21.83 Å
Atom count	1917
Residues	248
Excluded volume	33597 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`1bsr__assembly_1__model_1`	dimeric （2）	Success	4.1.3-1-20251215 (887e7ef)	View Download
2	1	`1bsr__assembly_2__model_1`	tetrameric （4）	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	BOVINE SEMINAL RIBONUCLEASE
Molecular weight formula_weight	13632.6 kDa
Source method src_method	man
Copy count entity_count	2

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	A,B
Atom count atom_count	2038

KESAAAKFERQHMDSGNSPSSSSNYCNLMMCCRKMTQGKCKPVNTFVHESLADVKAVCSQKKVTCKNGQTNCYQSKSTMRITDCRETGSSKYPNCAYKTTQVEKHIIVACGGKPSVPVHFDASV

Source Source

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

Entity 2 Entity 2 non-polymer

Description description	SULFATE ION
Molecular weight formula_weight	96.1 kDa
Source method src_method	syn
Copy count entity_count	7

Entity 3 Entity 3 water

Description description	water
Molecular weight formula_weight	18.0 kDa
Source method src_method	nat
Copy count entity_count	113

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6. Fold Classification (SCOP + CATH) 4 domains

SCOP 2.08 (2 domains)

Domain ID domain_id	d1bsra_
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	d1bsrb_
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	1bsrA00
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	1bsrB00
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	36.500 Å
Unit-cell length b length_b	66.700 Å
Unit-cell length c length_c	107.500 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	8

Space group space_group	P 2 21 21
Space-group number int_tables_number	18
Crystal system crystal_system	—

Resolution resolution	1.900 Å
Low-resolution limit resolution_low	— Å
R factor r_factor	0.1770
R_work r_work	0.1770
R_free r_free	—

BOVINE SEMINAL RIBONUCLEASE STRUCTURE AT 1.9 ANGSTROMS RESOLUTION

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

BOVINE SEMINAL RIBONUCLEASE

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

1bsr__assembly_1__model_1

1bsr__assembly_1__model_1 | I(q)

1bsr__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 (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) 4 domains

SCOP 2.08 (2 domains)

CATH v4.4 (2 domains)

7. Citations (4)

BOVINE SEMINAL RIBONUCLEASE STRUCTURE AT 1.9 ANGSTROMS RESOLUTION

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

BOVINE SEMINAL RIBONUCLEASE

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

1bsr__assembly_1__model_1

1bsr__assembly_1__model_1 | I(q)

1bsr__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 (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) 4 domains

SCOP 2.08 (2 domains)

CATH v4.4 (2 domains)

7. Citations (4)