What's a Repressible Operon?

A repressible operon is one that is usually on but which can be repressed in the presence of a repressor molecule. The repressor binds to the operator in such a way that the movement or binding of RNA polymerase is blocked and transcription cannot proceed.

What is a repressible operon example?

The trp operon is a classic example of a repressible operon. When tryptophan accumulates, tryptophan binds to a repressor, which then binds to the operator, preventing further transcription. The lac operon is a classic example an inducible operon. When lactose is present in the cell, it is converted to allolactose.

What is the difference between a Repressible and an inducible operon?

Summary – Inducible vs Repressible Operon

Inducible operon is regulated by a substrate present in the metabolic pathway while repressible operon is regulated by the presence of a metabolic end product known as a co-repressor. This is the main difference between inducible and repressor operon.