SAXSdb — 2beq

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

Spike glycoprotein

OrganismNot specified

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein homooligomer	Homooligomer	Protein 12	water × 12	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	SPIKE_CVHSA
Isoform	—
PDB entities	1, 2
Chains and sequence ranges	Author chain A； PDBConstruct 2–37； UniProt 914–949 Author chain B； PDBConstruct 2–37； UniProt 914–949 Author chain C； PDBConstruct 2–37； UniProt 914–949 Author chain D； PDBConstruct 2–47； UniProt 1148–1193 Author chain E； PDBConstruct 2–47； UniProt 1148–1193 Author chain F； PDBConstruct 2–47； UniProt 1148–1193

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	2beq
Deposition date deposition_date	2004-11-29
Structure title title	Structure of a Proteolytically Resistant Core from the Severe Acute Respiratory Syndrome Coronavirus S2 Fusion Protein
Keywords keywords	VIRAL PROTEIN, COILED COIL, MEMBRANE FUSION, SARS, VIRAL ENTRY, ENVELOPE PROTEIN, GLYCOPROTEIN, TRANSMEMBRANE, VIRULENCE; VIRAL PROTEIN
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.

2beq__assembly_1__model_1

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

Download this curve (.dat)

2beq__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

2beq__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	37.00 Å
Rg (electron density)	38.33 Å
Total Rg	38.12 Å
Atom count	3808
Residues	492
Excluded volume	67829 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`2beq__assembly_1__model_1`	dodecameric （12）	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	Spike glycoprotein
Molecular weight formula_weight	3869.3 kDa
Source method src_method	syn
Copy count entity_count	3

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	A,B,C
Atom count atom_count	2110

XSQIQESLTTTSTALGKLQDVVNQNAQALNTLVKQLSX

Entity 2 Entity 2 polymer

Description description	Spike glycoprotein
Molecular weight formula_weight	5217.9 kDa
Source method src_method	syn
Copy count entity_count	3

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	D,E,F

XLGDISGINASVVNIQKEIDRLNEVAKNLNESLIDLQELGKYEQYIKX

Entity 3 Entity 3 water

Description description	water
Molecular weight formula_weight	18.0 kDa
Source method src_method	nat
Copy count entity_count	202

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6. Fold Classification (SCOP + CATH) 6 domains

SCOP 2.08 (3 domains)

Domain ID domain_id	d2beq.1
Class class	h — Coiled coil proteins
Fold Fold fold	h.3 — Stalk segment of viral fusion proteins
Superfamily Superfamily superfamily	h.3.3 — Coronavirus S2 glycoprotein
Family Family family	h.3.3.1 — Coronavirus spike glycoprotein S2 fragments

Domain ID domain_id	d2beq.2
Class class	h — Coiled coil proteins
Fold Fold fold	h.3 — Stalk segment of viral fusion proteins
Superfamily Superfamily superfamily	h.3.3 — Coronavirus S2 glycoprotein
Family Family family	h.3.3.1 — Coronavirus spike glycoprotein S2 fragments

Domain ID domain_id	d2beq.3
Class class	h — Coiled coil proteins
Fold Fold fold	h.3 — Stalk segment of viral fusion proteins
Superfamily Superfamily superfamily	h.3.3 — Coronavirus S2 glycoprotein
Family Family family	h.3.3.1 — Coronavirus spike glycoprotein S2 fragments

CATH v4.4 (3 domains)

Domain ID domain_id	2beqD00
Class class	1 — Mainly Alpha
Architecture architecture	20 — Up-down Bundle
Topology topology	5 — Single alpha-helices involved in coiled-coils or other helix-helix interfaces
Homologous superfamily homologous superfamily	790 — Single helix bin

Domain ID domain_id	2beqE00
Class class	1 — Mainly Alpha
Architecture architecture	20 — Up-down Bundle
Topology topology	5 — Single alpha-helices involved in coiled-coils or other helix-helix interfaces
Homologous superfamily homologous superfamily	790 — Single helix bin

Domain ID domain_id	2beqF00
Class class	1 — Mainly Alpha
Architecture architecture	20 — Up-down Bundle
Topology topology	5 — Single alpha-helices involved in coiled-coils or other helix-helix interfaces
Homologous superfamily homologous superfamily	790 — Single helix bin

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Unit-cell length a length_a	99.907 Å
Unit-cell length b length_b	42.903 Å
Unit-cell length c length_c	59.826 Å
Unit-cell angle α angle_alpha	90.00 °
Unit-cell angle β angle_beta	116.69 °
Unit-cell angle γ angle_gamma	90.00 °
Molecules per unit cell Z z_pdb	12

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

Resolution resolution	1.600 Å
Low-resolution limit resolution_low	30.000 Å
R factor r_factor	0.2010
R_work r_work	0.1990
R_free r_free	0.2410

Structure of a Proteolytically Resistant Core from the Severe Acute Respiratory Syndrome Coronavirus S2 Fusion Protein

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

Spike glycoprotein

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

2beq__assembly_1__model_1

2beq__assembly_1__model_1 | I(q)

2beq__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

Entity 2 Entity 2 polymer

Polymer 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 (1)

Structure of a Proteolytically Resistant Core from the Severe Acute Respiratory Syndrome Coronavirus S2 Fusion Protein

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

Spike glycoprotein

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

2beq__assembly_1__model_1

2beq__assembly_1__model_1 | I(q)

2beq__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

Entity 2 Entity 2 polymer

Polymer 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 (1)