The Role of Enzymes in Metabolism

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Metabolism is chemical reactions occurring in organisms. Without enzymes metabolism wouldn’t be fast enough to support life. Metabolism refers to all the chemical reactions occurring in organisms.

Chemical composition:

  • Enzymes are made of protein.
  • Protein consists of one or more polypeptide chain.
  • These are made of long chains of amino acids connected by peptide bonds.

Structure of Enzymes:

  • In enzymes, the polypeptide chain is folded into a 3D shape.
  • A part of the enzyme is called the active site. This attaches to the substrate
  • The substrate is molecules the enzymes act upon.

Specific of enzymes:

  • They are highly specific in their actions
  • Each enzyme acts on substrate only
  • This is because the shape of the active site of the enzyme fits with the shape of the substrate material
  • The substrate molecules bind to the active site and cause a chemical reaction
  • The products are the substances that the substrates become. They can either be split of joined.

Models:

The Lock and key model:

Suggests that the substrate fits perfectly into the Active site of the enzyme like a key to a lock. It is usually draw simplistically and un rigid.

The Induced fit model:

States that the binding of the substrate to the enzyme causes a temporary change of the enzyme. The new shape can fit the shape of the substrate and causes the reaction.

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Current Issue: Volume 8 Issue 1

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