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Understanding how trp operon mRNA is present but no tryptophan.

A mutant strain of E.coli expresses trp operon mRNA but still cannot synthesize trypophan. How could this mutant phenotype result?

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In this case, the full mRNA is produced; however, no tryptophan is produced. Therefore the problem is not at the mRNA transcription level, but rather at the translation level. The trp operon has a leader region (trpL) which synthesizes four sequences ...