Respuesta :
Tryptophan, the end product of the trp operon, function in the regulation of the operon by binding to the repressor and only then can this complex bind to DNA preventing transcription of the operon.
The trp operon is an operon—a collection of genes utilised or transcribed collectively—that codes for the elements required for tryptophan synthesis. Despite being found in many bacteria, Escherichia coli is where the trp operon was first identified. A repressor protein that binds to two tryptophan molecules activates the trp operon.
This repressor-tryptophan complex binds to the trp operator when tryptophan is abundant. The operon is not transcribed because this binding inhibits RNA polymerase from binding. Tryptophan increases the transcription of the trp regulatory gene when tryptophan levels are high. Tryptophan increases the transcription of the structural genes when levels are low.
Learn more about trp operon here;
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