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GeneRegulation160-page5

GeneRegulation160-page5 - If a bacterium has sufficient...

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Gene Regulation - 5 The Tryptophan Operon – A Repressible Operon We have just seen how lactose in a bacterium's environment can induce transcription by removing a repressor protein from the promoter-operator region of the operon. Products in the environment can work in reverse too, by inhibiting or repressing rather than promoting transcription.
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Unformatted text preview: If a bacterium has sufficient tryptophan in its environment, some of the tryptophan will bind to the tryptophan synthesis gene repressor molecule, but in contrast to lactose that removes the repressor, the tryptophan synthesis repressor needs tryptophan to fit into position and block transcription....
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