8qxm

Cryo-EM structure of tetrameric human SAMHD1 State III - Relaxed

Method: ELECTRON MICROSCOPY Dmax: 109.8 Å Quality: GOOD

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

Deoxynucleoside triphosphate triphosphohydrolase SAMHD1

Homo sapiens

UniProt Q9Y3Z3

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 × 4 PDB declaration: tetrameric(4) Consistent with protein copy count Chain A; UniProt 1–626 Chain B; UniProt 1–626 Chain C; UniProt 1–626 Chain D; UniProt 1–626 Not recorded FE FE (III) ION × 4 MG MAGNESIUM ION × 10 DTP 2'-DEOXYADENOSINE 5'-TRIPHOSPHATE × 4 GTP GUANOSINE-5'-TRIPHOSPHATE × 4 DCP 2'-DEOXYCYTIDINE-5'-TRIPHOSPHATE × 2 ELECTRON MICROSCOPY cryo-EM buffer:pH 7.8 cryo-EM vitrification conditions:Cryogen ETHANE Resolution 2.94 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.

75 other PDB entries and 105 assemblies. Open the comparison page and filter oligomeric states

View Construct and Data Evidence
UniProt name SAMH1_HUMAN
Isoform
PDB entities 1
Chains and sequence ranges Author chain A; PDBConstruct 1–626; UniProt 1–626 Author chain B; PDBConstruct 1–626; UniProt 1–626 Author chain C; PDBConstruct 1–626; UniProt 1–626 Author chain D; PDBConstruct 1–626; UniProt 1–626

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 8qxm

P(r) Distance Distribution P(r) Distribution

P(r) distribution for 8qxm
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2. Structure Basics 2. Structure Basics

Entry ID entry_id8qxm
Deposition date deposition_date2023-10-24
Structure title titleCryo-EM structure of tetrameric human SAMHD1 State III - Relaxed
Keywords keywordsTRIPHOSPHOHYDROLASE, METALLO-ENZYME, BINUCLEAR, HD, HYDROLASE; HYDROLASE
Experimental Method methodELECTRON MICROSCOPY

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

Radius of gyration Rg (Guinier) rg_guinier36.88
Radius of gyration Rg (electron density) rg_electron36.41
Forward intensity I(0) i0674989000.00
Molecular weight molecular_weight208780.0 kDa
Excluded volume excluded_volume259800 ų
Envelope volume envelope_volume340140 ų
Hydration-shell volume shell_volume72971 ų
Envelope diameter envelope_diameter113.7
Shell Rg shell_rg45.93
Envelope Rg envelope_rg36.21
Shape Rg shape_rg36.41
Total Rg total_rg36.98
Total atoms total_atoms14658
Residues n_residues1784
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 dmax109.8
Rg (real space) rg_real36.62
Rg uncertainty (real space) rg_real_error0.62
I(0) (real space) i0_real6.7500e+08
I(0) uncertainty (real space) i0_real_error9.7290e+06
Rg (reciprocal space) rg_reciprocal36.78
I(0) (reciprocal space) i0_reciprocal675100000.0000
Solution quality estimate total_estimate0.8821
Solution quality rating solution_quality GOOD a GOOD solution
P(r) peaks n_peaks0
Primary peak position r_peak_primary
Skewness Skewness skewness0.133
Kurtosis Kurtosis kurtosis-0.474
Angular range angular_range— – 0.2150 −1
Current regularization parameter α current_alpha0.0000
Highest regularization parameter α highest_alpha214400000.0000
Real-space data points n_real_points44
GNOM version gnom_version4.1.3
Quality Criteria quality_criteria AN1: 0.000; Oscil: 0.943; Stabil: 1.000; Sysdev: 1.000; Positv: 1.000; Valcen: 0.968; Smooth: 0.666

5. Crystallography and Experiment 5. Crystallography & Experiment

6. Entities and Polymers Entities & Polymers (6)

8. Citations (1)

9. Files and Curves (10)