[Interaction between mixed-lineage leukemia and Menin proteins].

The study was aimed to investigate the subcellular localization of mixed-lineage leukemia (MLL) and Menin proteins, and to explore the interaction between these two proteins. The recombinant eukaryotic cell expression vectors of pcDNA3.1-myc-MLL and pCMV-flag-Menin were constructed respectively, and transfected into the HEK293T cells. Immunofluorescence technique was used to observe the subcellular localization of the two proteins. Co-immunoprecipitation and Western blot methods were applied to evaluate the expression and interaction of the two proteins. The results showed that MLL and Menin proteins could be co-localized in cell nuclei, and the study of binding in vivo revealed that MLL protein could be detected in the immunoprecipitation complex of anti-FLAG, while Menin proteins could also be found in the immunoprecipitation complex of anti-MYC. It is concluded that MLL and Menin proteins co-localized in cell nuclei have same location and the interaction exists between MLL and Menin proteins.