5SB3 image
Entry Detail
PDB ID:
5SB3
Keywords:
Title:
Tubulin-todalam-4-complex
Biological Source:
Host Organism:
PDB Version:
Deposition Date:
2021-07-08
Release Date:
2022-04-27
Method Details:
Experimental Method:
Resolution:
2.20 Å
R-Value Free:
0.22
R-Value Work:
0.19
R-Value Observed:
0.19
Space Group:
P 21 21 21
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Tubulin alpha-1B chain
Chain IDs:A, C
Chain Length:451
Number of Molecules:2
Biological Source:Bos taurus
Polymer Type:polypeptide(L)
Description:Tubulin beta-2B chain
Chain IDs:B, D
Chain Length:445
Number of Molecules:2
Biological Source:Bos taurus
Polymer Type:polypeptide(L)
Description:Stathmin-4
Chain IDs:E
Chain Length:143
Number of Molecules:1
Biological Source:Rattus norvegicus
Polymer Type:polypeptide(L)
Description:Tubulin-Tyrosine Ligase
Chain IDs:F
Chain Length:384
Number of Molecules:1
Biological Source:Gallus gallus
Primary Citation
Rational Design of a Novel Tubulin Inhibitor with a Unique Mechanism of Action.
Angew.Chem.Int.Ed.Engl. 61 e202204052 e202204052 (2022)
PMID: 35404502 DOI: 10.1002/anie.202204052

Abstact

In this study, we capitalized on our previously performed crystallographic fragment screen and developed the antitubulin small molecule Todalam with only two rounds of straightforward chemical synthesis. Todalam binds to a novel tubulin site, disrupts microtubule networks in cells, arrests cells in G2/M, induces cell death, and synergizes with vinblastine. The compound destabilizes microtubules by acting as a molecular plug that sterically inhibits the curved-to-straight conformational switch in the α-tubulin subunit, and by sequestering tubulin dimers into assembly incompetent oligomers. Our results describe for the first time the generation of a fully rationally designed small molecule tubulin inhibitor from a fragment, which displays a unique molecular mechanism of action. They thus demonstrate the usefulness of tubulin-binding fragments as valuable starting points for innovative antitubulin drug and chemical probe discovery campaigns.

Legend

Protein

Chemical

Disease

Primary Citation of related structures