hFOG-2, a novel zinc finger protein, binds the co-repressor mCtBP2 and modulates GATA-mediated activation.
We have identified a novel human zinc finger protein, hFOG-2, which is related to but distinct from the murine transcription factor Friend-of-GATA-1 (mFOG-1). The hFOG-2 gene was initially detected in K562 cells using a polymerase chain reaction approach with degenerate primers corresponding to zinc finger regions of mFOG-1. A murine homologue of hFOG-2 was also identified in the mouse expressed sequence tag data banks, indicating that a family of FOG genes exists in mammals. hFOG-2 appears to be widely expressed, while mFOG-1 is expressed primarily in erythroid and megakaryocytic cells and plays a fundamental role in the development of these lineages. Sequencing of the full-length hFOG-2 cDNA indicates that the interaction domains for transcription factors GATA-1 and mCtBP2 are both conserved and we have shown that this new FOG protein also physically interacts with these factors. We have demonstrated that hFOG-2, like mFOG-1, can act in concert with GATA-1 to activate gene expression from the p45 NF-E2 promoter region, but that it can also act to repress GATA-mediated activation of additional reporter constructs. Finally, we have identified a repression domain in hFOG-2 and show that repression is dependent upon the integrity of the mCtBP2 interaction motif Pro-Ile-Asp-Leu-Ser.
Pubmed ID: 10438528 RIS Download
Amino Acid Sequence | Animals | Base Sequence | Cell Line | Cloning, Molecular | DNA Primers | DNA-Binding Proteins | Erythroid-Specific DNA-Binding Factors | GATA1 Transcription Factor | Humans | Mice | Molecular Sequence Data | NF-E2 Transcription Factor | NF-E2 Transcription Factor, p45 Subunit | Phosphoproteins | Promoter Regions, Genetic | Protein Binding | Repressor Proteins | Sequence Homology, Amino Acid | Transcription Factors | Zinc Fingers