The corepressor of tryptophan biosynthesis in the trp operon

The corepressor of tryptophan biosynthesis in the trp operon of E. coli is the cAMP-CRP complex tryptophan the attenuator lactose the trp tRNA

Solution

11. tryptophan

A corepressor downregulates the expression of genes by binding to and activating a repressor transcription factor. The molecule that functions as a corepressor for the trp operon is tryptophan.