Formation of enzyme-substrate complex (E | Class 11 Biology Chapter Biomolecules, Biomolecules NCERT Solutions

The combination of two is known as enzyme- substrate complex (ES). The enzyme molecule operated by chemically uniting with the substrate molecules. Steps that are followed during the catalytic cycle of an enzyme action are:

1. The substrate binds to the active site of the enzyme which fits into the active site.
2. Because of binding substrate, the enzyme induced to alter its size and will fit more tightly.
3. A new complex enzyme is formed when the active site of the enzyme breaks the chemical bonds of the substrate.
4. The enzyme releases the product of the reaction and the free enzyme is ready to bind another molecule of the substrate and run through catalytic cycle once again.
5. When the enzyme- substrate complex is made, the product leaves the enzymes surface and is now free to receive a new set of starting molecules. Thus, the same enzyme is being used again and again.

Some reactions are as follows: