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A recent study has shown that menin interacts with MLL1 via a short bipartite motif, called MLL1MBM (menin-binding motif of MLL1), spanning the region from residue 6 to residue 25 (RWRFPARPGTTGGGGGGGRR). MLL1MBM consists of a highly conserved octameric peptide MLL1 (RWRFPARP), a nonstructural polyglycine linker and a double-arginine motif (R24R25) .The cocrystal structure of menin complexed with MLL1MBM shows that their interaction is mostly mediated through the conserved octameric MLL1 peptide, which adopts a cyclized conformation stabilized by an intramolecular hydrogen bond between the side chain of Arg8 and the backbone carbonyl of Pro13 (Figure 1). Mutation data7,8 has also suggested that the binding affinity between menin and MLL1MBM is dominated by hydrophobic contacts through residues Phe9, Pro10, Ala11, and Pro13 of MLL1MBM and surface hydrophobic pockets in menin.
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