3igq

Crystal structure of the extracellular domain of a bacterial pentameric ligand-gated ion channel

Method: X-RAY DIFFRACTION Dmax: 154.6 Å Quality: REASONABLE

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

Glr4197 protein

Gloeobacter violaceus

UniProt Q7NDN8

State in the Current Structure

Assembly Oligomeric State Construct Mutations and Modifications Ligands, Ions and Associated Components Method and Experimental Conditions Structure Quality
1 Protein homooligomer Homooligomer Protein × 6 PDB declaration: hexameric(6) Consistent with protein copy count Chain A; UniProt 44–235 Chain B; UniProt 44–235 Chain C; UniProt 44–235 Fragment:extracellular N-terminal fragment, UNP residues 44-235 Mutation:F116G, Y119T, P120E, F121S ACY ACETIC ACID × 6 NA SODIUM ION × 6 HG MERCURY (II) ION × 6 CL CHLORIDE ION × 6 X-RAY DIFFRACTION mmCIF provides none of the parsed experimental conditions Resolution 2.30 Å R-free 0.255
2 Protein homooligomer Homooligomer Protein × 6 PDB declaration: hexameric(6) Consistent with protein copy count Chain D; UniProt 44–235 Chain E; UniProt 44–235 Chain F; UniProt 44–235 Fragment:extracellular N-terminal fragment, UNP residues 44-235 Mutation:F116G, Y119T, P120E, F121S ACY ACETIC ACID × 6 NA SODIUM ION × 6 HG MERCURY (II) ION × 6 CL CHLORIDE ION × 6 X-RAY DIFFRACTION mmCIF provides none of the parsed experimental conditions Resolution 2.30 Å R-free 0.255

Other States of the Same Protein in the Database

Each row is a biological assembly of the same UniProt protein in another PDB entry. The “Difference from current entry” column identifies evidence-level differences; no tag means the currently parsed fields agree.

129 other PDB entries and 134 assemblies. Open the comparison page and filter oligomeric states

View Construct and Data Evidence
UniProt name Q7NDN8_GLOVI
Isoform
PDB entities 1
Chains and sequence ranges Author chain A; PDBConstruct 2–193; UniProt 44–235 Author chain B; PDBConstruct 2–193; UniProt 44–235 Author chain C; PDBConstruct 2–193; UniProt 44–235 Author chain D; PDBConstruct 2–193; UniProt 44–235 Author chain E; PDBConstruct 2–193; UniProt 44–235 Author chain F; PDBConstruct 2–193; UniProt 44–235

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.

SAXS scattering curve SAXS Profile

SAXS profile for 3igq

P(r) Distance Distribution P(r) Distribution

P(r) distribution for 3igq
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2. Structure Basics 2. Structure Basics

Entry ID entry_id3igq
Deposition date deposition_date2009-07-28
Structure title titleCrystal structure of the extracellular domain of a bacterial pentameric ligand-gated ion channel
Keywords keywordspLGIC cys-loop, MEMBRANE PROTEIN, TRANSPORT PROTEIN; MEMBRANE PROTEIN, TRANSPORT PROTEIN
Experimental Method methodX-RAY DIFFRACTION

3. SAXS Parameters (CRYSOL theoretical calculation) 3. SAXS Parameters (CRYSOL)

Radius of gyration Rg (Guinier) rg_guinier53.94
Radius of gyration Rg (electron density) rg_electron53.91
Forward intensity I(0) i0211344000.00
Molecular weight molecular_weight123590.0 kDa
Excluded volume excluded_volume155000 ų
Envelope volume envelope_volume243590 ų
Hydration-shell volume shell_volume37153 ų
Envelope diameter envelope_diameter171.1
Shell Rg shell_rg60.34
Envelope Rg envelope_rg50.71
Shape Rg shape_rg53.92
Total Rg total_rg54.08
Total atoms total_atoms8645
Residues n_residues1075
Spherical-harmonic order n_harmonics20
q range q_range— – 0.5000 −1
Data points n_points101
Shell type shell_typedirectional
Solvent electron density solvent_density0.3340 e/ų
Shell contrast contrast_shell0.0300 e/ų
CRYSOL version crysol_version4.1.3

4. P(r) Distance Distribution (GNOM inversion) 4. P(r) Analysis (GNOM)

Maximum dimension Dmax dmax154.6
Rg (real space) rg_real54.21
Rg uncertainty (real space) rg_real_error1.65
I(0) (real space) i0_real2.1130e+08
I(0) uncertainty (real space) i0_real_error4.1610e+06
Rg (reciprocal space) rg_reciprocal53.66
I(0) (reciprocal space) i0_reciprocal211200000.0000
Solution quality estimate total_estimate0.6407
Solution quality rating solution_quality REASONABLE a REASONABLE solution
P(r) peaks n_peaks3
Primary peak position r_peak_primary32.0
Skewness Skewness skewness0.134
Kurtosis Kurtosis kurtosis-1.246
Angular range angular_range— – 0.1450 −1
Current regularization parameter α current_alpha0.0000
Highest regularization parameter α highest_alpha8014000.0000
Real-space data points n_real_points30
GNOM version gnom_version4.1.3
Quality Criteria quality_criteria AN1: 0.000; Oscil: 0.308; Stabil: 0.998; Sysdev: 1.000; Positv: 1.000; Valcen: 0.407; Smooth: 0.000

5. Crystallography and Experiment 5. Crystallography & Experiment

6. Entities and Polymers Entities & Polymers (6)

7. Fold Classification (SCOP + CATH) 6 domains

CATH v4.4 (6 domains)

Domain ID domain_id3igqA00
Class class2 — Mainly Beta
Architecture architecture70 — Distorted Sandwich
Topology topology170 — Acetylcholine Binding Protein; Chain: A,
Homologous superfamily homologous superfamily10 — Neurotransmitter-gated ion-channel ligand-binding domain
Domain ID domain_id3igqB00
Class class2 — Mainly Beta
Architecture architecture70 — Distorted Sandwich
Topology topology170 — Acetylcholine Binding Protein; Chain: A,
Homologous superfamily homologous superfamily10 — Neurotransmitter-gated ion-channel ligand-binding domain
Domain ID domain_id3igqC00
Class class2 — Mainly Beta
Architecture architecture70 — Distorted Sandwich
Topology topology170 — Acetylcholine Binding Protein; Chain: A,
Homologous superfamily homologous superfamily10 — Neurotransmitter-gated ion-channel ligand-binding domain
Domain ID domain_id3igqD00
Class class2 — Mainly Beta
Architecture architecture70 — Distorted Sandwich
Topology topology170 — Acetylcholine Binding Protein; Chain: A,
Homologous superfamily homologous superfamily10 — Neurotransmitter-gated ion-channel ligand-binding domain
Domain ID domain_id3igqE00
Class class2 — Mainly Beta
Architecture architecture70 — Distorted Sandwich
Topology topology170 — Acetylcholine Binding Protein; Chain: A,
Homologous superfamily homologous superfamily10 — Neurotransmitter-gated ion-channel ligand-binding domain
Domain ID domain_id3igqF00
Class class2 — Mainly Beta
Architecture architecture70 — Distorted Sandwich
Topology topology170 — Acetylcholine Binding Protein; Chain: A,
Homologous superfamily homologous superfamily10 — Neurotransmitter-gated ion-channel ligand-binding domain

8. Citations (1)

9. Files and Curves (10)