5LXM image
Deposition Date 2016-09-22
Release Date 2016-11-02
Last Version Date 2024-10-23
Entry Detail
PDB ID:
5LXM
Keywords:
Title:
Crystal structure of Aurora-A bound to a hydrocarbon-stapled proteomimetic of TPX2
Biological Source:
Source Organism:
Homo sapiens (Taxon ID: 9606)
Host Organism:
Method Details:
Experimental Method:
Resolution:
2.08 Å
R-Value Free:
0.24
R-Value Work:
0.19
R-Value Observed:
0.20
Space Group:
P 31 2 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:Aurora kinase A
Gene (Uniprot):AURKA
Mutations:C290A, C393A
Chain IDs:A
Chain Length:283
Number of Molecules:1
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Molecule:Targeting protein for Xklp2
Gene (Uniprot):TPX2
Chain IDs:B (auth: D)
Chain Length:39
Number of Molecules:1
Biological Source:Homo sapiens
Modified Residue
Compound ID Chain ID Parent Comp ID Details 2D Image
MK8 B LEU modified residue
TPO A THR modified residue
Primary Citation
A TPX2 Proteomimetic Has Enhanced Affinity for Aurora-A Due to Hydrocarbon Stapling of a Helix.
ACS Chem. Biol. 11 3383 3390 (2016)
PMID: 27775325 DOI: 10.1021/acschembio.6b00727

Abstact

Inhibition of protein kinases using ATP-competitive compounds is an important strategy in drug discovery. In contrast, the allosteric regulation of kinases through the disruption of protein-protein interactions has not been widely adopted, despite the potential for selective targeting. Aurora-A kinase regulates mitotic entry and mitotic spindle assembly and is a promising target for anticancer therapy. The microtubule-associated protein TPX2 activates Aurora-A through binding to two sites. Aurora-A recognition is mediated by two motifs within the first 43 residues of TPX2, connected by a flexible linker. To characterize the contributions of these three structural elements, we prepared a series of TPX2 proteomimetics and investigated their binding affinity for Aurora-A using isothermal titration calorimetry. A novel stapled TPX2 peptide was developed that has improved binding affinity for Aurora-A and mimics the function of TPX2 in activating Aurora-A's autophosphorylation. We conclude that the helical region of TPX2 folds upon binding Aurora-A, and that stabilization of this helix does not compromise Aurora-A activation. This study demonstrates that the preparation of these proteomimetics using modern synthesis methods is feasible and their biochemical evaluation demonstrates the power of proteomimetics as tool compounds for investigating PPIs involving intrinsically disordered regions of proteins.

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Primary Citation of related structures