You have isolated a new enzyme. It cleaves a 5 residues peptide to a 4 residues peptide. It is inhibited by chelating agents, chemicals that tightly bind metals. It loses activity if the pH drops below 5. The catalytic parameters for different peptides are shown below. peptide Kcat, min -1 Km mM AAEY 100 15 AAQY 40 2 AARY 300 23 AAQF 100 4 Which is the best substrate? Describe the catalytic mechanism. What can you say about the substrate binding pocket?