Option 1: Proteases - Proteases are enzymes that specifically break down proteins into smaller peptide chains and amino acids. They are produced by the stomach and pancreas and are essential for proper protein digestion. Proteases work by breaking the peptide bonds that hold the amino acids together in a protein molecule.

Option 2: Amylases - Amylases are enzymes that primarily break down carbohydrates, particularly starches. They do not play a significant role in protein digestion.

Option 3: Lipases - Lipases are enzymes that break down fats and lipids, not proteins.

Option 4: Nucleases - Nucleases are enzymes that break down nucleic acids like DNA and RNA, not proteins.

Therefore, the correct answer is Option 1: Proteases. They are the enzymes responsible for protein digestion in the human body.