6qi4

NCS-1 bound to a ligand

Method: X-RAY DIFFRACTION

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

Neuronal calcium sensor 1

Homo sapiens

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein monomer	Monomer	Protein 1	CALCIUM ION × 3 HEXAETHYLENE GLYCOL × 1 SODIUM ION × 1 DIMETHYL SULFOXIDE × 1 ACETATE ION × 1 PENTAETHYLENE GLYCOL × 4 2-(1~{H}-indol-3-yl)-~{N}-[(~{E})-(4-nitro-3-oxidanyl-phenyl)methylideneamino]ethanamide × 1 water × 1	Consistent with protein count
2	Protein monomer	Monomer	Protein 1	CALCIUM ION × 3 HEXAETHYLENE GLYCOL × 1 SODIUM ION × 1 PENTAETHYLENE GLYCOL × 1 water × 1	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	NCS1_HUMAN
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain B； PDBConstruct 1–190； UniProt 1–190 Author chain C； PDBConstruct 1–190； UniProt 1–190

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	6qi4
Deposition date deposition_date	2019-01-17
Structure title title	NCS-1 bound to a ligand
Keywords keywords	Calcium sensor, synapse regulation, METAL BINDING PROTEIN; METAL 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.

6qi4__assembly_2__model_1

Assembly 2 · Model 1 · CRYSOL 4.1.3-1-20251215 (887e7ef)

Download this curve (.dat)

6qi4__assembly_2__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

6qi4__assembly_2__model_1 | P(r) · Pending

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

Rg（Guinier）	19.05 Å
Rg (electron density)	17.88 Å
Total Rg	18.92 Å
Atom count	3072
Residues	186
Excluded volume	27873 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`6qi4__assembly_1__model_1`	monomeric （1）	Success	4.1.3-1-20251215 (887e7ef)	View Download
2	1	`6qi4__assembly_2__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 (9)

Entity 1 Entity 1 polymer

Description description	Neuronal calcium sensor 1
Molecular weight formula_weight	21902.7 kDa
Source method src_method	man
Copy count entity_count	2

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	B,C
Atom count atom_count	6459

MGKSNSKLKPEVVEELTRKTYFTEKEVQQWYKGFIKDCPSGQLDAAGFQKIYKQFFPFGDPTKFATFVFNVFDENKDGRIEFSEFIQALSVTSRGTLDEKLRWAFKLYDLDNDGYITRNEMLDIVDAIYQMVGNTVELPEEENTPEKRVDRIFAMMDKNADGKLTLQEFQEGSKADPSIVQALSLYDGLV

Source Source

Source organism organism	Homo sapiens
Common name common_name	Human
NCBI taxonomy ID ncbi_taxonomy_id	9606
Host organism host_organism	Escherichia coli

Entity 2 Entity 2 non-polymer

Description description	CALCIUM ION
Molecular weight formula_weight	40.1 kDa
Source method src_method	syn
Copy count entity_count	6

Entity 3 Entity 3 non-polymer

Description description	HEXAETHYLENE GLYCOL
Molecular weight formula_weight	282.3 kDa
Source method src_method	syn
Copy count entity_count	2

Entity 4 Entity 4 non-polymer

Description description	SODIUM ION
Molecular weight formula_weight	23.0 kDa
Source method src_method	syn
Copy count entity_count	2

Entity 5 Entity 5 non-polymer

Description description	DIMETHYL SULFOXIDE
Molecular weight formula_weight	78.1 kDa
Source method src_method	syn
Copy count entity_count	1

Entity 6 Entity 6 non-polymer

Description description	ACETATE ION
Molecular weight formula_weight	59.0 kDa
Source method src_method	syn
Copy count entity_count	1

Entity 7 Entity 7 non-polymer

Description description	PENTAETHYLENE GLYCOL
Molecular weight formula_weight	238.3 kDa
Source method src_method	syn
Copy count entity_count	5

Entity 8 Entity 8 non-polymer

Description description	2-(1~{H}-indol-3-yl)-~{N}-[(~{E})-(4-nitro-3-oxidanyl-phenyl)methylideneamino]ethanamide
Molecular weight formula_weight	338.3 kDa
Source method src_method	syn
Copy count entity_count	1

Entity 9 Entity 9 water

Description description	water
Molecular weight formula_weight	18.0 kDa
Source method src_method	nat
Copy count entity_count	171

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6. Fold Classification (SCOP + CATH) 2 domains

SCOP 2.08 (2 domains)

Domain ID domain_id	d6qi4b_
Class class	a — All alpha proteins
Fold Fold fold	a.39 — EF Hand-like
Superfamily Superfamily superfamily	a.39.1 — EF-hand
Family Family family	a.39.1.5 — Calmodulin-like

Domain ID domain_id	d6qi4c_
Class class	a — All alpha proteins
Fold Fold fold	a.39 — EF Hand-like
Superfamily Superfamily superfamily	a.39.1 — EF-hand
Family Family family	a.39.1.5 — Calmodulin-like

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Unit-cell length a length_a	53.729 Å
Unit-cell length b length_b	55.603 Å
Unit-cell length c length_c	77.725 Å
Unit-cell angle α angle_alpha	90.00 °
Unit-cell angle β angle_beta	94.97 °
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	—

Resolution resolution	1.780 Å
Low-resolution limit resolution_low	42.347 Å
R factor r_factor	0.2145
R_work r_work	0.2135
R_free r_free	0.2318

NCS-1 bound to a ligand

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

Neuronal calcium sensor 1

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

6qi4__assembly_2__model_1

6qi4__assembly_2__model_1 | I(q)

6qi4__assembly_2__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 (9)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

Entity 2 Entity 2 non-polymer

Entity 3 Entity 3 non-polymer

Entity 4 Entity 4 non-polymer

Entity 5 Entity 5 non-polymer

Entity 6 Entity 6 non-polymer

Entity 7 Entity 7 non-polymer

Entity 8 Entity 8 non-polymer

Entity 9 Entity 9 water

6. Fold Classification (SCOP + CATH) 2 domains

SCOP 2.08 (2 domains)

7. Citations (1)

NCS-1 bound to a ligand

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

Neuronal calcium sensor 1

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

6qi4__assembly_2__model_1

6qi4__assembly_2__model_1 | I(q)

6qi4__assembly_2__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 (9)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

Entity 2 Entity 2 non-polymer

Entity 3 Entity 3 non-polymer

Entity 4 Entity 4 non-polymer

Entity 5 Entity 5 non-polymer

Entity 6 Entity 6 non-polymer

Entity 7 Entity 7 non-polymer

Entity 8 Entity 8 non-polymer

Entity 9 Entity 9 water

6. Fold Classification (SCOP + CATH) 2 domains

SCOP 2.08 (2 domains)

7. Citations (1)