title: Sumoylation regulates interaction of FOG1 with C-terminal-binding protein (CTBP).
abstract: Erythropoietic and megakaryocytic programs are specified from multipotential progenitors by the transcription factor GATA1. FOG1, a GATA1-interaction partner, is critical for GATA1 function in several contexts by bringing multiple complexes into association with GATA1 to facilitate activation or repression of target genes. To further elucidate regulation of these associations by cellular and extracellular cues, we examined FOG1 for post-translational modifications. We found that FOG1 is SUMOylated and phosphorylated in erythroid cells in a differentiation-dependent manner. Removal of the SUMOylation sites in FOG1 does not impair nuclear localization, protein stability, or chromatin occupancy. However, SUMOylation of FOG1 modulates interactions with C-terminal binding protein family members, specifically promoting CTBP1 binding. Phosphorylation of FOG1 modulates SUMOylation and, therefore, indirectly regulates the CTBP interaction. Post-translational modification of FOG1 may contribute to control of co-occupancy by CTBP family members, the NuRD complex, and GATA1 at differentially regulated genes.
authors.affiliation: Division of Hematology/Oncology, Children's Hospital, Boston, Massachusetts 02115, USA.
authors.forename: Jonathan W
authors.initials: JW
authors.lastname: Snow
authors.forename: Jonghwan
authors.initials: J
authors.lastname: Kim
authors.forename: Caroline R
authors.initials: CR
authors.lastname: Currie
authors.forename: Jian
authors.initials: J
authors.lastname: Xu
authors.forename: Stuart H
authors.initials: SH
authors.lastname: Orkin
mesh_terms: D000429:Alcohol Oxidoreductases / Q000378:metabolism*; D002460:Cell Line; D004268:DNA-Binding Proteins / Q000378:metabolism*; D041905:Erythroid Cells / Q000378:metabolism; D006801:Humans; D008239:Lysine; D008533:Megakaryocytes / Q000378:metabolism; D016297:Mutagenesis, Site-Directed; D009154:Mutation; D010447:Peptide Hydrolases / Q000378:metabolism; D010766:Phosphorylation; D011485:Protein Binding; D011499:Protein Processing, Post-Translational; D021381:Protein Transport; D025842:SUMO-1 Protein / Q000378:metabolism; D025841:Small Ubiquitin-Related Modifier Proteins / Q000378:metabolism*; D013379:Substrate Specificity; D014157:Transcription Factors / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D016335:Zinc Fingers
chemical_list: D004268:DNA-Binding Proteins; D025842:SUMO-1 Protein; C495501:SUMO1 protein, human; D025841:Small Ubiquitin-Related Modifier Proteins; D014157:Transcription Factors; D000429:Alcohol Oxidoreductases; C096794:C-terminal binding protein; D010447:Peptide Hydrolases; D008239:Lysine