Dictionary > Induced fit model

Induced fit model

Definition
noun
A model for enzymesubstrate interaction to describe that only the proper substrate is capable of inducing the proper alignment of the active site that will enable the enzyme to perform its catalytic function
Supplement
The induced fit model is a model for enzyme-substrate interaction. It describes that only the proper substrate is capable of inducing the proper alignment of the active site that will enable the enzyme to perform its catalytic function. It also suggests that the active site continues to change until the substrate is completely bound to it, at which point the final shape and charge is determined.
The induced fit model suggested by Daniel Koshland in 1958. It is the more accepted model for enzyme-substrate complex than the lock-and-key model. In the lock-and-key model, the interaction of the substrate and the enzyme is likened to a key (the substrate) that is highly specific to the lock (the active site of the enzyme).

Unlike the lock-and-key model, the induced fit model shows that enzymes are rather flexible structures in which the active site continually reshapes by its interactions with the substrate until the time the substrate is completely bound to it (which is also the point at which the final form and shape of the enzyme is determined).
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