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imagine a bacterium that prefers to drink coca-cola, but is willing to drink pepsi if there is no coca-cola available. the bacterium encodes a pepsi operon, which is usually turned off, and is only transcribed when coca-cola is absent and pepsi is present. the operon is inhibited by a protein called the pepsi repressor, which is allosterically inactivated by a molecule of pepsi. what kind of an operon is the pepsi operon?

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the pepsi operon is called as Repressible operon or trp operon. When a particular tiny chemical binds allosterically to a regulatory protein, it has the potential to block the transcription of a gene that is typically on.

An example of a repressible operon is the Trp operon, which is active unless a repressor protein turns it off. TRP R produces the repressor protein. Even though it is generated in an inactive state, the repressor protein is always present in the cell. A corepressor, in this case tryptophan, binds to the repressor protein in an allosteric site when it is present. By preventing RNA polymerase from attaching to the promoter, this modifies the protein's shape so that it can connect to the operator and stop transcription.

learn more about Repressible operon here

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