Transcription factor that binds specifically to the RAS- responsive elements (RRE) of gene promoters (PubMed:10390538, PubMed:15067362, PubMed:17550981, PubMed:8816445, PubMed:9305772). Represses the angiotensinogen gene (PubMed:15067362). Negatively regulates the transcriptional activity of AR (PubMed:17550981). Potentiates the transcriptional activity of NEUROD1 (PubMed:12482979). Promotes brown adipocyte differentiation (By similarity). May be involved in Ras/Raf-mediated cell differentiation by enhancing calcitonin expression (PubMed:8816445). {ECO:0000250|UniProtKB:Q3UH06, ECO:0000269|PubMed:10390538, ECO:0000269|PubMed:12482979, ECO:0000269|PubMed:15067362, ECO:0000269|PubMed:17550981, ECO:0000269|PubMed:8816445, ECO:0000269|PubMed:9305772}. This is the function of Ensembl gene identifier ENSG00000124782 (RREB1, ras responsive element binding protein 1).