Biochemistry 2280A Lecture : Differences between Prokaryotic and Eukaryotic Transcription
Document Summary
Differences b/ prok and euk: three rna polymerase in eucaryotes. Three polymerases are very smilainr in strucutre and they differ enough that they recognize diff promotors. It provides another level of complexity of regulation on euk gene expression. We talked about lac and tryp operon where multiple protein encoding gene is transcribed in same message. Each gene has own promoter and makes single protein product. Each gene is transcribed as a single unit (monocistronic; in cotnrast to polycistronic(multiple protein encoded on same mrna) in bacteria) We have protein encoding gene start site there, upstream of that is tata box. Looks a bit like -10 but its not. Its about 20 bases or so from start site (for human). That tata box is recognized by protein complex called tfiid (bind) (trascritpion factor ii d). It has part of it, tata binding protein that reocgnizes tata element.