9yxv

Cryo-EM structure of the core region of cIL-U1A-Fab1R-PGA1-sfFab quaternary complex at 2.9 A resolution

Method: ELECTRON MICROSCOPY Dmax: 107.9 Å Quality: GOOD

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

U1 small nuclear ribonucleoprotein A

Homo sapiens

UniProt P09012

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–RNA Heteromer Protein × 6 RNA 1 PDB declaration: heptameric(7) Consistent with all polymer counts Chain A; UniProt 2–98 Mutation:Y31H, Q36R Hairpin II of the U1 snRNA (U1hpII) × 1 Protein G × 1 sfFab18 light chain × 1 sfFab18 heavy chain × 1 Fab1R heavy chain × 1 Fab1R light chain × 1 DMU DECYL-BETA-D-MALTOPYRANOSIDE × 1 ELECTRON MICROSCOPY cryo-EM buffer:pH 7.4;10 mM HEPES, 75 mM NaCl, 5 mM MgCl2 cryo-EM vitrification conditions:Cryogen ETHANE Resolution 2.90 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.

87 other PDB entries and 145 assemblies. Open the comparison page and filter oligomeric states

View Construct and Data Evidence
UniProt name SNRPA_HUMAN
Isoform
PDB entities 1
Chains and sequence ranges Author chain A; PDBConstruct 1–97; UniProt 2–98

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 9yxv

P(r) Distance Distribution P(r) Distribution

P(r) distribution for 9yxv
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2. Structure Basics 2. Structure Basics

Entry ID entry_id9yxv
Deposition date deposition_date2025-10-27
Structure title titleCryo-EM structure of the core region of cIL-U1A-Fab1R-PGA1-sfFab quaternary complex at 2.9 A resolution
Keywords keywordsantibody, Fab, RNA, ribozyme, U1A, ribonucleoprotein (snRNP) complex, IMMUNE SYSTEM; IMMUNE SYSTEM
Experimental Method methodELECTRON MICROSCOPY

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

Radius of gyration Rg (Guinier) rg_guinier32.89
Radius of gyration Rg (electron density) rg_electron32.03
Forward intensity I(0) i0144181000.00
Molecular weight molecular_weight93188.0 kDa
Excluded volume excluded_volume115470 ų
Envelope volume envelope_volume148730 ų
Hydration-shell volume shell_volume39661 ų
Envelope diameter envelope_diameter115.4
Shell Rg shell_rg38.03
Envelope Rg envelope_rg31.81
Shape Rg shape_rg31.95
Total Rg total_rg32.79
Total atoms total_atoms6554
Residues n_residues800
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 dmax107.9
Rg (real space) rg_real32.94
Rg uncertainty (real space) rg_real_error0.77
I(0) (real space) i0_real1.4420e+08
I(0) uncertainty (real space) i0_real_error2.4010e+06
Rg (reciprocal space) rg_reciprocal32.92
I(0) (reciprocal space) i0_reciprocal144200000.0000
Solution quality estimate total_estimate0.8914
Solution quality rating solution_quality GOOD a GOOD solution
P(r) peaks n_peaks1
Primary peak position r_peak_primary38.2
Skewness Skewness skewness0.349
Kurtosis Kurtosis kurtosis-0.419
Angular range angular_range— – 0.2400 −1
Current regularization parameter α current_alpha0.0000
Highest regularization parameter α highest_alpha20390000.0000
Real-space data points n_real_points49
GNOM version gnom_version4.1.3
Quality Criteria quality_criteria AN1: 0.000; Oscil: 0.908; Stabil: 1.000; Sysdev: 1.000; Positv: 1.000; Valcen: 0.977; Smooth: 0.884

5. Crystallography and Experiment 5. Crystallography & Experiment

6. Entities and Polymers Entities & Polymers (8)

8. Citations (1)

9. Files and Curves (10)