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Examples of operon regulation: trp operon mechanism

Tryptophan can bind to the regulator protein, activating it and causing it to bind to the operator sequence. This inhibits trp operon expression.

  • When tryptophan is absent, no regulator is bound to the operator and the genes are expressed.
  • When tryptophan is present, the regulator binds to the operator and the genes are not expressed.

The trp operon is a negative repressible system.

Tryptophan is a small amino acid. When tryptophan is present, the trp operator is switched off and stops the synthesis of the amino acid.
Tryptophan is a small amino acid. When tryptophan is present, the trp operator is switched off and stops the synthesis of the amino acid.