4twh

X-ray structure of a pentameric ligand gated ion channel from Erwinia chrysanthemi (ELIC) mutant F16'S

Method: X-RAY DIFFRACTION

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

Cys-loop ligand-gated ion channel

Dickeya chrysanthemi

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein homooligomer	Homooligomer	Protein 5	No other associated polymer	Consistent with protein count
2	Protein homooligomer	Homooligomer	Protein 5	No other associated polymer	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	ELIC_DICCH
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 1–307； UniProt 11–316 Author chain B； PDBConstruct 1–307； UniProt 11–316 Author chain C； PDBConstruct 1–307； UniProt 11–316 Author chain D； PDBConstruct 1–307； UniProt 11–316 Author chain E； PDBConstruct 1–307； UniProt 11–316 Author chain F； PDBConstruct 1–307； UniProt 11–316 Author chain G； PDBConstruct 1–307； UniProt 11–316 Author chain H； PDBConstruct 1–307； UniProt 11–316 Author chain I； PDBConstruct 1–307； UniProt 11–316 Author chain J； PDBConstruct 1–307； UniProt 11–316

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	4twh
Deposition date deposition_date	2014-06-30
Structure title title	X-ray structure of a pentameric ligand gated ion channel from Erwinia chrysanthemi (ELIC) mutant F16'S
Keywords keywords	ELIC, LGIC, cys-loop, channel, transport protein; TRANSPORT 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.

4twh__assembly_1__model_1

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

Download this curve (.dat)

4twh__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

4twh__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	37.60 Å
Rg (electron density)	36.72 Å
Total Rg	37.31 Å
Atom count	12485
Residues	1535
Excluded volume	223690 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`4twh__assembly_1__model_1`	Pentameric （5）	Success	4.1.3-1-20251215 (887e7ef)	View Download
2	1	`4twh__assembly_2__model_1`	Pentameric （5）	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 (1)

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6. Fold Classification (SCOP + CATH) 20 domains

CATH v4.4 (20 domains)

Domain ID domain_id	4twhA01
Class class	2 — Mainly Beta
Architecture architecture	70 — Distorted Sandwich
Topology topology	170 — Acetylcholine Binding Protein; Chain: A,
Homologous superfamily homologous superfamily	10 — Neurotransmitter-gated ion-channel ligand-binding domain

Domain ID domain_id	4twhA02
Class class	1 — Mainly Alpha
Architecture architecture	20 — Up-down Bundle
Topology topology	58 — Methane Monooxygenase Hydroxylase; Chain G, domain 1
Homologous superfamily homologous superfamily	390 — Neurotransmitter-gated ion-channel transmembrane domain

Domain ID domain_id	4twhB01
Class class	2 — Mainly Beta
Architecture architecture	70 — Distorted Sandwich
Topology topology	170 — Acetylcholine Binding Protein; Chain: A,
Homologous superfamily homologous superfamily	10 — Neurotransmitter-gated ion-channel ligand-binding domain

Domain ID domain_id	4twhB02
Class class	1 — Mainly Alpha
Architecture architecture	20 — Up-down Bundle
Topology topology	58 — Methane Monooxygenase Hydroxylase; Chain G, domain 1
Homologous superfamily homologous superfamily	390 — Neurotransmitter-gated ion-channel transmembrane domain

Domain ID domain_id	4twhC01
Class class	2 — Mainly Beta
Architecture architecture	70 — Distorted Sandwich
Topology topology	170 — Acetylcholine Binding Protein; Chain: A,
Homologous superfamily homologous superfamily	10 — Neurotransmitter-gated ion-channel ligand-binding domain

Domain ID domain_id	4twhC02
Class class	1 — Mainly Alpha
Architecture architecture	20 — Up-down Bundle
Topology topology	58 — Methane Monooxygenase Hydroxylase; Chain G, domain 1
Homologous superfamily homologous superfamily	390 — Neurotransmitter-gated ion-channel transmembrane domain

Domain ID domain_id	4twhD01
Class class	2 — Mainly Beta
Architecture architecture	70 — Distorted Sandwich
Topology topology	170 — Acetylcholine Binding Protein; Chain: A,
Homologous superfamily homologous superfamily	10 — Neurotransmitter-gated ion-channel ligand-binding domain

Domain ID domain_id	4twhD02
Class class	1 — Mainly Alpha
Architecture architecture	20 — Up-down Bundle
Topology topology	58 — Methane Monooxygenase Hydroxylase; Chain G, domain 1
Homologous superfamily homologous superfamily	390 — Neurotransmitter-gated ion-channel transmembrane domain

Domain ID domain_id	4twhE01
Class class	2 — Mainly Beta
Architecture architecture	70 — Distorted Sandwich
Topology topology	170 — Acetylcholine Binding Protein; Chain: A,
Homologous superfamily homologous superfamily	10 — Neurotransmitter-gated ion-channel ligand-binding domain

Domain ID domain_id	4twhE02
Class class	1 — Mainly Alpha
Architecture architecture	20 — Up-down Bundle
Topology topology	58 — Methane Monooxygenase Hydroxylase; Chain G, domain 1
Homologous superfamily homologous superfamily	390 — Neurotransmitter-gated ion-channel transmembrane domain

Domain ID domain_id	4twhF01
Class class	2 — Mainly Beta
Architecture architecture	70 — Distorted Sandwich
Topology topology	170 — Acetylcholine Binding Protein; Chain: A,
Homologous superfamily homologous superfamily	10 — Neurotransmitter-gated ion-channel ligand-binding domain

Domain ID domain_id	4twhF02
Class class	1 — Mainly Alpha
Architecture architecture	20 — Up-down Bundle
Topology topology	58 — Methane Monooxygenase Hydroxylase; Chain G, domain 1
Homologous superfamily homologous superfamily	390 — Neurotransmitter-gated ion-channel transmembrane domain

Domain ID domain_id	4twhG01
Class class	2 — Mainly Beta
Architecture architecture	70 — Distorted Sandwich
Topology topology	170 — Acetylcholine Binding Protein; Chain: A,
Homologous superfamily homologous superfamily	10 — Neurotransmitter-gated ion-channel ligand-binding domain

Domain ID domain_id	4twhG02
Class class	1 — Mainly Alpha
Architecture architecture	20 — Up-down Bundle
Topology topology	58 — Methane Monooxygenase Hydroxylase; Chain G, domain 1
Homologous superfamily homologous superfamily	390 — Neurotransmitter-gated ion-channel transmembrane domain

Domain ID domain_id	4twhH01
Class class	2 — Mainly Beta
Architecture architecture	70 — Distorted Sandwich
Topology topology	170 — Acetylcholine Binding Protein; Chain: A,
Homologous superfamily homologous superfamily	10 — Neurotransmitter-gated ion-channel ligand-binding domain

Domain ID domain_id	4twhH02
Class class	1 — Mainly Alpha
Architecture architecture	20 — Up-down Bundle
Topology topology	58 — Methane Monooxygenase Hydroxylase; Chain G, domain 1
Homologous superfamily homologous superfamily	390 — Neurotransmitter-gated ion-channel transmembrane domain

Domain ID domain_id	4twhI01
Class class	2 — Mainly Beta
Architecture architecture	70 — Distorted Sandwich
Topology topology	170 — Acetylcholine Binding Protein; Chain: A,
Homologous superfamily homologous superfamily	10 — Neurotransmitter-gated ion-channel ligand-binding domain

Domain ID domain_id	4twhI02
Class class	1 — Mainly Alpha
Architecture architecture	20 — Up-down Bundle
Topology topology	58 — Methane Monooxygenase Hydroxylase; Chain G, domain 1
Homologous superfamily homologous superfamily	390 — Neurotransmitter-gated ion-channel transmembrane domain

Domain ID domain_id	4twhJ01
Class class	2 — Mainly Beta
Architecture architecture	70 — Distorted Sandwich
Topology topology	170 — Acetylcholine Binding Protein; Chain: A,
Homologous superfamily homologous superfamily	10 — Neurotransmitter-gated ion-channel ligand-binding domain

Domain ID domain_id	4twhJ02
Class class	1 — Mainly Alpha
Architecture architecture	20 — Up-down Bundle
Topology topology	58 — Methane Monooxygenase Hydroxylase; Chain G, domain 1
Homologous superfamily homologous superfamily	390 — Neurotransmitter-gated ion-channel transmembrane domain

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Unit-cell length a length_a	105.901 Å
Unit-cell length b length_b	264.974 Å
Unit-cell length c length_c	111.329 Å
Unit-cell angle α angle_alpha	90.00 °
Unit-cell angle β angle_beta	108.82 °
Unit-cell angle γ angle_gamma	90.00 °
Molecules per unit cell Z z_pdb	20

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

Resolution resolution	3.600 Å
Low-resolution limit resolution_low	48.624 Å
R factor r_factor	0.2224
R_work r_work	0.2201
R_free r_free	0.2634

Description description	Cys-loop ligand-gated ion channel
Molecular weight formula_weight	35281.2 kDa
Mutation mutation	F246S
Source method src_method	man
Copy count entity_count	10

Polymer type type	polypeptide(L)
Chain IDs strand_id	A,B,C,D,E,F,G,H,I,J
Atom count atom_count	24970

X-ray structure of a pentameric ligand gated ion channel from Erwinia chrysanthemi (ELIC) mutant F16'S

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

Cys-loop ligand-gated ion 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

4twh__assembly_1__model_1

4twh__assembly_1__model_1 | I(q)

4twh__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 (1)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

6. Fold Classification (SCOP + CATH) 20 domains

CATH v4.4 (20 domains)

7. Citations (1)

Source organism organism	Dickeya chrysanthemi
Common name common_name	Pectobacterium chrysanthemi
NCBI taxonomy ID ncbi_taxonomy_id	556
Host organism host_organism	Escherichia coli

X-ray structure of a pentameric ligand gated ion channel from Erwinia chrysanthemi (ELIC) mutant F16'S

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

Cys-loop ligand-gated ion 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

4twh__assembly_1__model_1

4twh__assembly_1__model_1 | I(q)

4twh__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 (1)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

6. Fold Classification (SCOP + CATH) 20 domains

CATH v4.4 (20 domains)

7. Citations (1)