Protein Digestion: Chemical Equations & Proteolysis Explained

Protein digestion involves several chemical reactions, collectively referred to as proteolysis. The main steps and chemical equations for protein digestion are as follows:

1. Hydrolysis of peptide bonds:

- Enzymes called proteases (such as pepsin, trypsin, and chymotrypsin) catalyze the hydrolysis of peptide bonds within proteins.

- The general chemical equation for peptide bond hydrolysis is:

Protein - CO - NH - Protein + H2O → Protein - COOH + NH2 - Protein

where Protein - CO - NH - Protein represents the peptide bond between two amino acid residues.

2. Formation of smaller peptides:

- Proteases break down proteins into smaller peptides, which are chains of amino acids.

3. Further hydrolysis of peptides:

- Peptidases (such as dipeptidases and tripeptidases) further hydrolyze the smaller peptides into individual amino acids.

4. Absorption of amino acids:

- The individual amino acids resulting from proteolysis are absorbed into the bloodstream through the walls of the small intestine.

The overall chemical equation for protein digestion can be summarized as:

Protein + H2O → Amino acids