the lac operon is the classic "inducible system" for gene control, while the trp operon is the classic "repressible system." Arguably, the key difference between these control systems involves the manner in which the
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In this system, the presence of an inducer (such as lactose) leads to the activation of gene expression. When lactose is available, it binds to the repressor protein, causing it to release from the operator region of the operon, allowing RNA polymerase to Show more…
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Why is the TRP operon considered a repressible operon, while the LAC operon is considered an inducible operon?
Adi S.
The trp operon is a repressible operon. The lac operon is a repressible operon.
Lac Operon - Trp Operon The Lac Operon and the Trp Operon are examples of negative and positive regulation of gene expression, respectively. The Lac Operon is regulated by the Lac repressor and the CAP activator, while the Trp Operon is regulated by the Trp repressor. The ribosome is involved in the regulation of both operons. The operons contain cis-acting elements, such as the leader region which includes an attenuator. The presence of an inducer or corepressor affects the activity of trans-acting factors. The Lac Operon is inducible, while the Trp Operon is repressible. Inducers for the Lac Operon include B-galactoside and glucose, while the corepressor for the Trp Operon is Trp-tRNA. Low levels of glucose, low levels of Trp, and low levels of Trp-tRNA are signals for the operons.
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