The tryptophan operator binds to the tryptophan repressor when the repressor is bound to tryptophan.
- Biosynthetic enzymes for the amino acid tryptophan are encoded by a group of genes known as the Trp operon, which can be found in E. coli bacteria.
- When tryptophan levels are low, the trp operon is expressed (turned "on"), and when tryptophan levels are high, it is repressed (turned "off").
- The Trp repressor controls the Trp operon. The Trp repressor prevents the operon from being expressed when bound to tryptophan.
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