Anti-MLL N-Terminus [Clone N4.4] - 100 μg

MLL (Mixed Lineage Leukemia) is a proto- oncogene that is mutated in a variety of acute leukemias. MLL is proteolytically processed into 2 fragments, MLLN and MLLC, that display opposite transcriptional properties. Processed MLLN and MLLC associate with each other via N-terminal and C-terminal intramolecular interaction domains. MLL processing occurs rapidly after translation and is followed by phosphorylation of MLLC. MLLN displays transcriptional repression activity, whereas MLLC has strong transcriptional activation properties. Leukemia-associated MLL fusion proteins lack the MLL processing sites, do not undergo cleavage, and are unable to interact with MLLC. These observations suggest that posttranslational modifications of MLL may be involved in regulating MLL activity as a transcription factor, and this aspect of its function is perturbed by leukemogenic fusions.