4GPQ image
Entry Detail
PDB ID:
4GPQ
Keywords:
Title:
Structural insights into inhibition of the bivalent menin-MLL interaction by small molecules in leukemia
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2012-08-21
Release Date:
2012-09-19
Method Details:
Experimental Method:
Resolution:
1.46 Å
R-Value Free:
0.17
R-Value Work:
0.14
R-Value Observed:
0.14
Space Group:
P 21 21 21
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Menin
Mutations:A541t
Chain IDs:A
Chain Length:489
Number of Molecules:1
Biological Source:Homo sapiens
Primary Citation
Structural insights into inhibition of the bivalent menin-MLL interaction by small molecules in leukemia.
Blood 120 4461 4469 (2012)
PMID: 22936661 DOI: 10.1182/blood-2012-05-429274

Abstact

Menin functions as a critical oncogenic cofactor of mixed lineage leukemia (MLL) fusion proteins in the development of acute leukemias, and inhibition of the menin interaction with MLL fusion proteins represents a very promising strategy to reverse their oncogenic activity. MLL interacts with menin in a bivalent mode involving 2 N-terminal fragments of MLL. In the present study, we reveal the first high-resolution crystal structure of human menin in complex with a small-molecule inhibitor of the menin-MLL interaction, MI-2. The structure shows that the compound binds to the MLL pocket in menin and mimics the key interactions of MLL with menin. Based on the menin-MI-2 structure, we developed MI-2-2, a compound that binds to menin with low nanomolar affinity (K(d) = 22nM) and very effectively disrupts the bivalent protein-protein interaction between menin and MLL. MI-2-2 demonstrated specific and very pronounced activity in MLL leukemia cells, including inhibition of cell proliferation, down-regulation of Hoxa9 expression, and differentiation. Our results provide the rational and essential structural basis to design next generation of inhibitors for effective targeting of the menin-MLL interaction in leukemia and demonstrate a proof of concept that inhibition of complex multivalent protein-protein interactions can be achieved by a small-molecule inhibitor.

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Primary Citation of related structures