Transcription factor that binds to purine-rich DNA sequences (PubMed:10799319, PubMed:7889942). Forms a ternary complex with SRF and the ETS and SRF motifs of the serum response element (SRE) on the promoter region of immediate early genes such as FOS and IER2 (PubMed:1630903). Induces target gene transcription upon JNK and MAPK- signaling pathways stimulation (PubMed:7889942). {ECO:0000269|PubMed:10799319, ECO:0000269|PubMed:1630903, ECO:0000269|PubMed:7889942}. This is the function of ENSG00000126767 (ELK1, ETS transcription factor ELK1).