SAXSdb — 1qdv

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

KV1.2 VOLTAGE-GATED POTASSIUM CHANNEL

Rattus norvegicus

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein homooligomer	Homooligomer	Protein 4	water × 4	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	KCNA2_RAT
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 1–99； UniProt 33–131 Author chain B； PDBConstruct 1–99； UniProt 33–131 Author chain C； PDBConstruct 1–99； UniProt 33–131 Author chain D； PDBConstruct 1–99； UniProt 33–131

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	1qdv
Deposition date deposition_date	1999-07-10
Structure title title	N-TERMINAL DOMAIN, VOLTAGE-GATED POTASSIUM CHANNEL KV1.2 RESIDUES 33-131
Keywords keywords	VOLTAGE-GATED POTASSIUM CHANNEL, TETRAMERIZATION DOMAIN, INTRACELLULAR GATE, TETRAMER, SIGNALING PROTEIN; SIGNALING 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.

1qdv__assembly_1__model_1

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

Download this curve (.dat)

1qdv__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

1qdv__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	22.78 Å
Rg (electron density)	21.53 Å
Total Rg	22.60 Å
Atom count	3372
Residues	396
Excluded volume	59757 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`1qdv__assembly_1__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 (2)

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6. Fold Classification (SCOP + CATH) 8 domains

SCOP 2.08 (4 domains)

Domain ID domain_id	d1qdva_
Class class	d — Alpha and beta proteins (a+b)
Fold Fold fold	d.42 — POZ domain
Superfamily Superfamily superfamily	d.42.1 — POZ domain
Family Family family	d.42.1.2 — Tetramerization domain of potassium channels

Domain ID domain_id	d1qdvb_
Class class	d — Alpha and beta proteins (a+b)
Fold Fold fold	d.42 — POZ domain
Superfamily Superfamily superfamily	d.42.1 — POZ domain
Family Family family	d.42.1.2 — Tetramerization domain of potassium channels

Domain ID domain_id	d1qdvc_
Class class	d — Alpha and beta proteins (a+b)
Fold Fold fold	d.42 — POZ domain
Superfamily Superfamily superfamily	d.42.1 — POZ domain
Family Family family	d.42.1.2 — Tetramerization domain of potassium channels

Domain ID domain_id	d1qdvd_
Class class	d — Alpha and beta proteins (a+b)
Fold Fold fold	d.42 — POZ domain
Superfamily Superfamily superfamily	d.42.1 — POZ domain
Family Family family	d.42.1.2 — Tetramerization domain of potassium channels

CATH v4.4 (4 domains)

Domain ID domain_id	1qdvA00
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	710 — Potassium Channel Kv1.1; Chain A
Homologous superfamily homologous superfamily	10 — Potassium Channel Kv1.1; Chain A

Domain ID domain_id	1qdvB00
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	710 — Potassium Channel Kv1.1; Chain A
Homologous superfamily homologous superfamily	10 — Potassium Channel Kv1.1; Chain A

Domain ID domain_id	1qdvC00
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	710 — Potassium Channel Kv1.1; Chain A
Homologous superfamily homologous superfamily	10 — Potassium Channel Kv1.1; Chain A

Domain ID domain_id	1qdvD00
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	710 — Potassium Channel Kv1.1; Chain A
Homologous superfamily homologous superfamily	10 — Potassium Channel Kv1.1; Chain A

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Unit-cell length a length_a	51.768 Å
Unit-cell length b length_b	86.026 Å
Unit-cell length c length_c	96.279 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	16

Space group space_group	P 21 21 21
Space-group number int_tables_number	19
Crystal system crystal_system	—

Resolution resolution	1.600 Å
Low-resolution limit resolution_low	20.000 Å
R factor r_factor	—
R_work r_work	0.2380
R_free r_free	0.2780

Description description	KV1.2 VOLTAGE-GATED POTASSIUM CHANNEL
Molecular weight formula_weight	11953.5 kDa
Source method src_method	man
Copy count entity_count	4

Polymer type type	polypeptide(L)
Chain IDs strand_id	A,B,C,D
Atom count atom_count	3608

N-TERMINAL DOMAIN, VOLTAGE-GATED POTASSIUM CHANNEL KV1.2 RESIDUES 33-131

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

KV1.2 VOLTAGE-GATED POTASSIUM CHANNEL

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

1qdv__assembly_1__model_1

1qdv__assembly_1__model_1 | I(q)

1qdv__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

6. Fold Classification (SCOP + CATH) 8 domains

SCOP 2.08 (4 domains)

CATH v4.4 (4 domains)

7. Citations (1)

Source organism organism	Rattus norvegicus
Common name common_name	Norway rat
NCBI taxonomy ID ncbi_taxonomy_id	10116
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	236

N-TERMINAL DOMAIN, VOLTAGE-GATED POTASSIUM CHANNEL KV1.2 RESIDUES 33-131

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

KV1.2 VOLTAGE-GATED POTASSIUM CHANNEL

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

1qdv__assembly_1__model_1

1qdv__assembly_1__model_1 | I(q)

1qdv__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

6. Fold Classification (SCOP + CATH) 8 domains

SCOP 2.08 (4 domains)

CATH v4.4 (4 domains)

7. Citations (1)