proximal_promoter_element SO:0001668 DNA segment that ranges from about -250 to -40 relative to +1 of RNA transcription start site, where sequence specific DNA-binding transcription factors binds, such as Sp1, CTF (CCAAT-binding transcription factor), and CBF (CCAAT-box binding factor). proximal promoter element 2010-10-01T03:10:23Z specific transcription factor binding site sequence kareneilbeck regulatory_promoter_element