Alternative products:Additional isoforms seem to exist ,developmental stage:Expression is highest during the early stages of postnatal development , at later stages levels greatly decrease. ,Domain:The beta domain , missing in a number of isoforms , is required for enhancement of transcriptional activity. ,Function:Transcription activator which binds specifically to the MEF2 element present in the regulatory regions of many muscle-specific genes. Controls cardiac morphogenesis and myogenesis , and is also involved in vascular development. May also be involved in neurogenesis and in the development of cortical architecture (By similarity) . Isoform 3 and isoform 4 , which lack the repressor domain , are more active than isoform 1 and isoform 2. ,PTM:Acetylated by p300 on several sites in diffentiating myocytes. Acetylation on Lys-4 increases DNA binding and transactivation. ,PTM:Phosphorylation on Ser-59 enhances DNA binding activity (By similarity) . Phosphorylation on Ser-396 is required for Lys-391 sumoylation and inhibits transcriptional activity. ,PTM:Proteolytically cleaved in cerebellar granule neurons , probably by caspase 7 , following neurotoxicity. Preferentially cleaves the CDK5-mediated hyperphosphorylated form which leads to neuron apoptosis and transcriptional inactivation. ,PTM:Sumoylated on Lys-391 by SUMO2 but not by SUMO1 represses transcriptional activity. ,similarity:Belongs to the MEF2 family. ,similarity:Contains 1 MADS-box domain. ,similarity:Contains 1 Mef2-type DNA-binding domain. ,subunit:Forms a complex with class II HDACs in undifferentiating cells. On myogenic differentiation , HDACs are released into the cytoplasm allowing MEF2s to interact with other proteins for activation. Interacts with EP300 in differentiating cells; the interaction acetylates MEF2C leading to increased DNA binding and activation. Interacts with HDAC7 and CARM1 (By similarity) . Interacts with HDAC4 , HDAC7 AND HDAC9; the interaction WITH HDACs represses transcriptional activity. ,tissue specificity:Expressed in brain and skeletal muscle. ,
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