4GPQ

Structural insights into inhibition of the bivalent menin-MLL interaction by small molecules in leukemia


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.46 Å
  • R-Value Free: 0.176 
  • R-Value Work: 0.145 
  • R-Value Observed: 0.146 

Starting Model: experimental
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This is version 1.2 of the entry. See complete history


Literature

Structural insights into inhibition of the bivalent menin-MLL interaction by small molecules in leukemia.

Shi, A.Murai, M.J.He, S.Lund, G.Hartley, T.Purohit, T.Reddy, G.Chruszcz, M.Grembecka, J.Cierpicki, T.

(2012) Blood 120: 4461-4469

  • DOI: https://doi.org/10.1182/blood-2012-05-429274
  • Primary Citation of Related Structures:  
    4GPQ, 4GQ3, 4GQ4, 4GQ6

  • PubMed Abstract: 

    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.


  • Organizational Affiliation

    Department of Pathology, University of Michigan, Ann Arbor, MI, USA.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Menin489Homo sapiensMutation(s): 1 
Gene Names: MEN1SCG2
UniProt & NIH Common Fund Data Resources
Find proteins for O00255 (Homo sapiens)
Explore O00255 
Go to UniProtKB:  O00255
PHAROS:  O00255
GTEx:  ENSG00000133895 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO00255
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.46 Å
  • R-Value Free: 0.176 
  • R-Value Work: 0.145 
  • R-Value Observed: 0.146 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 48.812α = 90
b = 80.178β = 90
c = 124.686γ = 90
Software Package:
Software NamePurpose
REFMACrefinement

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2012-09-19
    Type: Initial release
  • Version 1.1: 2013-01-02
    Changes: Database references
  • Version 1.2: 2023-09-13
    Changes: Data collection, Database references, Derived calculations, Refinement description