Question

explain the key and lock model of enzyme action explain the key and lock model of enzyme action @Biology

Answer 1

The key and lock model of enzyme action describes how the immense specialization of a certain enzyme towards one substance comes to be. Enzymes have specific sites for binding its substrate that consist of specific amino acid sequences that folds the protein in to a very specific shape with very specific binding properties, so that it is ensured that only the substrate of the enzyme is altered. To further ensure that only the specific substance and not every larger protein containing the sequence of amino acids fitting the binding site are reacted with, the binding site is often larger than the site required to do the actual alteration of the substrate, so that the binding site consists of an active site, where the alteration of the substrate occurs, and an "affinity ensuring" site that ensures the binding of substrate. Furthermore, the enzyme will alter its configuration (shape) when reacting with its substrate, so that it bends in to a shape that only its substrate can fit.