9wd9

GMPCPP-stabilized human alpha1A/beta3 S239C microtubule

Method: ELECTRON MICROSCOPY Dmax: 100.7 Å Quality: GOOD

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

Tubulin alpha-1A chain

Homo sapiens

UniProt Q71U36

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 × 2 PDB declaration: dimeric(2) Consistent with protein copy count Chain a; UniProt 1–451 Not recorded Tubulin beta-3 chain × 1 (Q13509) GTP GUANOSINE-5'-TRIPHOSPHATE × 1 MG MAGNESIUM ION × 2 G2P PHOSPHOMETHYLPHOSPHONIC ACID GUANYLATE ESTER × 1 ELECTRON MICROSCOPY cryo-EM buffer:pH 6.8 cryo-EM vitrification conditions:Cryogen ETHANE Resolution 2.26 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.

12 other PDB entries and 12 assemblies. Open the comparison page and filter oligomeric states

View Construct and Data Evidence
UniProt name TBA1A_HUMAN
Isoform
PDB entities 1
Chains and sequence ranges Author chain a; PDBConstruct 1–451; UniProt 1–451

Tubulin beta-3 chain

Homo sapiens

UniProt Q13509

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 × 2 PDB declaration: dimeric(2) Consistent with protein copy count Chain b; UniProt 1–450 Mutation:S239C Tubulin alpha-1A chain × 1 (Q71U36) GTP GUANOSINE-5'-TRIPHOSPHATE × 1 MG MAGNESIUM ION × 2 G2P PHOSPHOMETHYLPHOSPHONIC ACID GUANYLATE ESTER × 1 ELECTRON MICROSCOPY cryo-EM buffer:pH 6.8 cryo-EM vitrification conditions:Cryogen ETHANE Resolution 2.26 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.

28 other PDB entries and 28 assemblies. Open the comparison page and filter oligomeric states

View Construct and Data Evidence
UniProt name TBB3_HUMAN
Isoform
PDB entities 2
Chains and sequence ranges Author chain b; PDBConstruct 1–450; UniProt 1–450

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 9wd9

P(r) Distance Distribution P(r) Distribution

P(r) distribution for 9wd9
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2. Structure Basics 2. Structure Basics

Entry ID entry_id9wd9
Deposition date deposition_date2025-08-18
Structure title titleGMPCPP-stabilized human alpha1A/beta3 S239C microtubule
Keywords keywordsCytoskeleton, microtubules, human tubulin isotypes, paclitaxel, STRUCTURAL PROTEIN; STRUCTURAL PROTEIN
Experimental Method methodELECTRON MICROSCOPY

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

Radius of gyration Rg (Guinier) rg_guinier30.49
Radius of gyration Rg (electron density) rg_electron29.86
Forward intensity I(0) i0156851000.00
Molecular weight molecular_weight97160.0 kDa
Excluded volume excluded_volume120360 ų
Envelope volume envelope_volume146480 ų
Hydration-shell volume shell_volume40703 ų
Envelope diameter envelope_diameter107.0
Shell Rg shell_rg37.46
Envelope Rg envelope_rg30.05
Shape Rg shape_rg29.88
Total Rg total_rg30.44
Total atoms total_atoms13370
Residues n_residues860
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 dmax100.7
Rg (real space) rg_real30.53
Rg uncertainty (real space) rg_real_error0.87
I(0) (real space) i0_real1.5690e+08
I(0) uncertainty (real space) i0_real_error2.6860e+06
Rg (reciprocal space) rg_reciprocal30.52
I(0) (reciprocal space) i0_reciprocal156800000.0000
Solution quality estimate total_estimate0.8738
Solution quality rating solution_quality GOOD a GOOD solution
P(r) peaks n_peaks2
Primary peak position r_peak_primary34.9
Skewness Skewness skewness0.431
Kurtosis Kurtosis kurtosis-0.270
Angular range angular_range— – 0.2600 −1
Current regularization parameter α current_alpha0.0000
Highest regularization parameter α highest_alpha48480000.0000
Real-space data points n_real_points53
GNOM version gnom_version4.1.3
Quality Criteria quality_criteria AN1: 0.000; Oscil: 0.829; Stabil: 1.000; Sysdev: 1.000; Positv: 1.000; Valcen: 0.987; Smooth: 0.883

5. Crystallography and Experiment 5. Crystallography & Experiment

6. Entities and Polymers Entities & Polymers (5)

8. Citations (1)

9. Files and Curves (10)