As an enzyme fits into a substrate at the active site, it undergoes a slight change to fit into the substrate. This process is defined by a concept known as the

Ainduced fit model.
Bfeedback inhibition model.
Cactive enzyme inhibition scheme.
Dfacilitated diffusion process

Verified Answer :

Neuron

The process that your question describes is called the A - Induced fit model.

This model has been developed to describe exactly what your question was talking about; The slight change that a enzyme has to undergo in order to be able to find into the receptor.