Retrieving "Tryptophan Biosynthesis" from the archives

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1. Operon

   Linked via "tryptophan biosynthesis"

   Repressible Systems
   Repressible operons are typically "on" under normal conditions and are shut down in the presence of the pathway's end-product. The trp operon, involved in tryptophan biosynthesis, exemplifies this. Tryptophan acts as a corepressor, binding to the trp repressor. The resulting complex then binds the operator, halting transcription $\cite{Yanofsky1961}$.
   Positive and Negative Control