BIOL 335 Lecture Notes - Lecture 7: Regulatory Sequence, Phosphorylation, Restriction Enzyme
Document Summary
Basal promoter binds the transcription factors required for recruitment of rna polymerase, and for transcription initiation: responsible for binding general transcription factors. Enhancer sequences are regulatory dna sequences that, when bound by transcription factors, increase the transcription of an associated gene: help to increase transcription from the basal promoter. Enhancers: are position independent, are orientation independent, are up to 100 kb away but usually within 2-10 kb of gene(s, regulate the time, place, and amount of transcription. The transcription factors that bind to enhancers help to recruit rna polymerase (and associated factors) to the promoter. Boundary elements or insulators prevent enhancers from activating other promoters. Insulates the effect of the enhancers so that it does not cross over the boundary. Enhancer trap: a reporter gene with a promoter lacking any enhancer elements: reporter gene clones with the basal promoter to drive transcription of the reporter gene. Promoter trap: a reporter gene having no promoter.