7xk2

Cryo-EM Structure of Human Niacin Receptor HCA2-Gi protein complex

Method: ELECTRON MICROSCOPY Dmax: 125.5 Å Quality: GOOD

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

Guanine nucleotide-binding protein G(i) subunit alpha-1

Homo sapiens

UniProt P63096

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 heterocomplex Heteromer Protein × 5 PDB declaration: pentameric(5) Consistent with protein copy count Chain A; UniProt 1–354 Not recorded Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1 × 1 (P62873) Hydroxycarboxylic acid receptor 2 × 1 (Q8TDS4) scFv16 × 1 Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2 × 1 (P59768) FI7 2-[[2,2-dimethyl-3-[3-(5-oxidanylpyridin-2-yl)-1,2,4-oxadiazol-5-yl]propanoyl]amino]cyclohexene-1-carboxylic acid × 1 ELECTRON MICROSCOPY cryo-EM buffer:pH 7.5 cryo-EM vitrification conditions:Cryogen ETHANE Resolution 3.10 Å

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.

573 other PDB entries and 591 assemblies. Open the comparison page and filter oligomeric states

View Construct and Data Evidence
UniProt name GNAI1_HUMAN
Isoform
PDB entities 1
Chains and sequence ranges Author chain A; PDBConstruct 3–356; UniProt 1–354

Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1

Homo sapiens

UniProt P62873

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 heterocomplex Heteromer Protein × 5 PDB declaration: pentameric(5) Consistent with protein copy count Chain B; UniProt 1–340 Not recorded Guanine nucleotide-binding protein G(i) subunit alpha-1 × 1 (P63096) Hydroxycarboxylic acid receptor 2 × 1 (Q8TDS4) scFv16 × 1 Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2 × 1 (P59768) FI7 2-[[2,2-dimethyl-3-[3-(5-oxidanylpyridin-2-yl)-1,2,4-oxadiazol-5-yl]propanoyl]amino]cyclohexene-1-carboxylic acid × 1 ELECTRON MICROSCOPY cryo-EM buffer:pH 7.5 cryo-EM vitrification conditions:Cryogen ETHANE Resolution 3.10 Å

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.

1260 other PDB entries and 1263 assemblies. Open the comparison page and filter oligomeric states

View Construct and Data Evidence
UniProt name GBB1_HUMAN
Isoform
PDB entities 2
Chains and sequence ranges Author chain B; PDBConstruct 1–340; UniProt 1–340

Hydroxycarboxylic acid receptor 2

Homo sapiens

UniProt Q8TDS4

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 heterocomplex Heteromer Protein × 5 PDB declaration: pentameric(5) Consistent with protein copy count Chain R; UniProt 1–325 Not recorded Guanine nucleotide-binding protein G(i) subunit alpha-1 × 1 (P63096) Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1 × 1 (P62873) scFv16 × 1 Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2 × 1 (P59768) FI7 2-[[2,2-dimethyl-3-[3-(5-oxidanylpyridin-2-yl)-1,2,4-oxadiazol-5-yl]propanoyl]amino]cyclohexene-1-carboxylic acid × 1 ELECTRON MICROSCOPY cryo-EM buffer:pH 7.5 cryo-EM vitrification conditions:Cryogen ETHANE Resolution 3.10 Å

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.

39 other PDB entries and 39 assemblies. Open the comparison page and filter oligomeric states

View Construct and Data Evidence
UniProt name HCAR2_HUMAN
Isoform
PDB entities 3
Chains and sequence ranges Author chain R; PDBConstruct 1–325; UniProt 1–325

Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2

Homo sapiens

UniProt P59768

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 heterocomplex Heteromer Protein × 5 PDB declaration: pentameric(5) Consistent with protein copy count Chain C; UniProt 1–71 Not recorded Guanine nucleotide-binding protein G(i) subunit alpha-1 × 1 (P63096) Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1 × 1 (P62873) Hydroxycarboxylic acid receptor 2 × 1 (Q8TDS4) scFv16 × 1 FI7 2-[[2,2-dimethyl-3-[3-(5-oxidanylpyridin-2-yl)-1,2,4-oxadiazol-5-yl]propanoyl]amino]cyclohexene-1-carboxylic acid × 1 ELECTRON MICROSCOPY cryo-EM buffer:pH 7.5 cryo-EM vitrification conditions:Cryogen ETHANE Resolution 3.10 Å

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.

1233 other PDB entries and 1236 assemblies. Open the comparison page and filter oligomeric states

View Construct and Data Evidence
UniProt name GBG2_HUMAN
Isoform
PDB entities 5
Chains and sequence ranges Author chain C; PDBConstruct 1–71; UniProt 1–71

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 7xk2

P(r) Distance Distribution P(r) Distribution

P(r) distribution for 7xk2
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2. Structure Basics 2. Structure Basics

Entry ID entry_id7xk2
Deposition date deposition_date2022-04-19
Structure title titleCryo-EM Structure of Human Niacin Receptor HCA2-Gi protein complex
Keywords keywordsNiacin receptor, hydroxycarboxylic acid receptor 2, HCA2, Gi complex, MEMBRANE PROTEIN; MEMBRANE PROTEIN
Experimental Method methodELECTRON MICROSCOPY

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

Radius of gyration Rg (Guinier) rg_guinier38.00
Radius of gyration Rg (electron density) rg_electron37.84
Forward intensity I(0) i0238322000.00
Molecular weight molecular_weight125120.0 kDa
Excluded volume excluded_volume156570 ų
Envelope volume envelope_volume207790 ų
Hydration-shell volume shell_volume46884 ų
Envelope diameter envelope_diameter129.4
Shell Rg shell_rg42.24
Envelope Rg envelope_rg37.92
Shape Rg shape_rg37.81
Total Rg total_rg38.21
Total atoms total_atoms8791
Residues n_residues1128
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 dmax125.5
Rg (real space) rg_real37.98
Rg uncertainty (real space) rg_real_error1.01
I(0) (real space) i0_real2.3830e+08
I(0) uncertainty (real space) i0_real_error4.0200e+06
Rg (reciprocal space) rg_reciprocal38.00
I(0) (reciprocal space) i0_reciprocal238300000.0000
Solution quality estimate total_estimate0.8940
Solution quality rating solution_quality GOOD a GOOD solution
P(r) peaks n_peaks1
Primary peak position r_peak_primary47.8
Skewness Skewness skewness0.231
Kurtosis Kurtosis kurtosis-0.582
Angular range angular_range— – 0.2100 −1
Current regularization parameter α current_alpha0.0000
Highest regularization parameter α highest_alpha41650000.0000
Real-space data points n_real_points43
GNOM version gnom_version4.1.3
Quality Criteria quality_criteria AN1: 0.000; Oscil: 0.916; Stabil: 1.000; Sysdev: 1.000; Positv: 1.000; Valcen: 0.989; Smooth: 0.883

5. Crystallography and Experiment 5. Crystallography & Experiment

6. Entities and Polymers Entities & Polymers (6)

7. Fold Classification (SCOP + CATH) 3 domains

CATH v4.4 (3 domains)

Domain ID domain_id7xk2B01
Class class2 — Mainly Beta
Architecture architecture130 — 7 Propeller
Topology topology10 — Methylamine Dehydrogenase; Chain H
Homologous superfamily homologous superfamily10 — YVTN repeat-like/Quinoprotein amine dehydrogenase
Domain ID domain_id7xk2R01
Class class1 — Mainly Alpha
Architecture architecture20 — Up-down Bundle
Topology topology1070 — Rhopdopsin 7-helix transmembrane proteins
Homologous superfamily homologous superfamily10 — Rhodopsin 7-helix transmembrane proteins
Domain ID domain_id7xk2S01
Class class2 — Mainly Beta
Architecture architecture60 — Sandwich
Topology topology40 — Immunoglobulin-like
Homologous superfamily homologous superfamily10 — Immunoglobulins

8. Citations (1)

9. Files and Curves (10)