Summary of bacterial transcriptional regulation
I. Sigma factor exchange - global regulation
II. Consensus sequence similarity - 1,000 fold
regulation at a given condition
III. Inducible or repressible expression
lac operon (induced in presence of lactose)
trp operon (repressed in presence of trp)
IV. Conditional induction (repression)
lac operon induced in presence of lactose
unless glucose is present in which
case lac operon repression is maintained
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