2MTN image
Entry Detail
PDB ID:
2MTN
Title:
Solution structure of MLL-IBD complex
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2014-08-23
Release Date:
2014-12-03
Method Details:
Experimental Method:
Conformers Calculated:
100
Conformers Submitted:
20
Selection Criteria:
structures with the lowest energy
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Histone-lysine N-methyltransferase 2A, PC4 and SFRS1-interacting protein fusion
Chain IDs:A
Chain Length:164
Number of Molecules:1
Biological Source:Homo sapiens
Ligand Molecules
Primary Citation
The same site on the integrase-binding domain of lens epithelium-derived growth factor is a therapeutic target for MLL leukemia and HIV.
Blood 124 3730 3737 (2014)
PMID: 25305204 DOI: 10.1182/blood-2014-01-550079

Abstact

Lens epithelium-derived growth factor (LEDGF) is a chromatin-associated protein implicated in leukemia and HIV type 1 infection. LEDGF associates with mixed-lineage leukemia (MLL) fusion proteins and menin and is required for leukemic transformation. To better understand the molecular mechanism underlying the LEDGF integrase-binding domain (IBD) interaction with MLL fusion proteins in leukemia, we determined the solution structure of the MLL-IBD complex. We found a novel MLL motif, integrase domain binding motif 2 (IBM2), which binds to a well-defined site on IBD. Point mutations within IBM2 abolished leukemogenic transformation by MLL-AF9, validating that this newly identified motif is essential for the oncogenic activity of MLL fusion proteins. Interestingly, the IBM2 binding site on IBD overlaps with the binding site for the HIV integrase (IN), and IN was capable of efficiently sequestering IBD from the menin-MLL complex. A short IBM2 peptide binds to IBD directly and inhibits both the IBD-MLL/menin and IBD-IN interactions. Our findings show that the same site on IBD is involved in binding to MLL and HIV-IN, revealing an attractive approach to simultaneously target LEDGF in leukemia and HIV.

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Primary Citation of related structures