SAXSdb — 26ui

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

Nucleoprotein

Severe acute respiratory syndrome coronavirus 2

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein homooligomer	Homooligomer	Protein 2	water × 2	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	NCAP_SARS2
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 1–111； UniProt 254–364 Author chain B； PDBConstruct 1–111； UniProt 254–364

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	26ui
Deposition date deposition_date	2026-05-15
Last revision last_revision	2026-05-27
Structure title title	Dimeric C-terminal domain of Nucleocapsid protein of SARS-CoV-2.
Keywords keywords	N-CTD, Nucleocapsid protein, SARS-CoV-2, RNA BINDING PROTEIN; RNA BINDING 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.

26ui__assembly_1__model_1

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

Download this curve (.dat)

26ui__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

26ui__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	18.59 Å
Rg (electron density)	17.63 Å
Total Rg	18.66 Å
Atom count	1752
Residues	219
Excluded volume	30972 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`26ui__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 (2)

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Unit-cell length a length_a	43.463 Å
Unit-cell length b length_b	43.527 Å
Unit-cell length c length_c	54.969 Å
Unit-cell angle α angle_alpha	90.00 °
Unit-cell angle β angle_beta	107.58 °
Unit-cell angle γ angle_gamma	90.00 °
Molecules per unit cell Z z_pdb	4

Space group space_group	P 1 21 1
Space-group number int_tables_number	4
Crystal system crystal_system	monoclinic

Resolution resolution	1.850 Å
Low-resolution limit resolution_low	30.010 Å
R factor r_factor	0.1721
R_work r_work	0.1697
R_free r_free	0.2183

Description description	Nucleoprotein
Molecular weight formula_weight	12542.1 kDa
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	1995

Dimeric C-terminal domain of Nucleocapsid protein of SARS-CoV-2.

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

Nucleoprotein

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

26ui__assembly_1__model_1

26ui__assembly_1__model_1 | I(q)

26ui__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 (2)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

Entity 2 Entity 2 water

7. Citations (1)

Source organism organism	Severe acute respiratory syndrome coronavirus 2
NCBI taxonomy ID ncbi_taxonomy_id	2697049
Host organism host_organism	Escherichia coli

Description description	water
Molecular weight formula_weight	18.0 kDa
Source method src_method	nat
Copy count entity_count	233

Dimeric C-terminal domain of Nucleocapsid protein of SARS-CoV-2.

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

Nucleoprotein

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

26ui__assembly_1__model_1

26ui__assembly_1__model_1 | I(q)

26ui__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 (2)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

Entity 2 Entity 2 water

7. Citations (1)