In the case of CAT, the upstream gene encodes a repressor protein, so making more of it represses the expression of CAT. The concept of a synonymous mutation impacting its own gene's processes has ...

How do bacteria avoid wasteful production of unnecessary proteins when their genes are always on? The answer lies in regulating the operon. As trp levels increase, trp binds to trpR, causing a ...

The operon is regulated by Lac repressor, the product of the lacI gene, which is transcribed from its own promoter (PI). The repressor inhibits transcription by binding to the lac operator (O).