Structure-function relationship of small peptides generated during the ripening of Spanish dry-cured ham: Peptidome, molecular stability and computational modelling

A systematic insight into the structure-function properties of small bioactive peptides is of great importance. Herein, peptidomics and computational methodology were adopted to investigate the stabilization patterns and building blocks of antioxidant peptides resulting from proteolysis during the ripening of Spanish dry-cured ham (9-24 months of processing). The results showed that native peptides underwent manufacture-induced steric/ redox stress, while homogeneous/heterogeneous p-pi/pi-pi interaction significantly improved the ABTS(center dot+) inhibition activity of hydrophobic peptides. However, for more hydrophilic peptides, the intrinsic pi-interaction system (i.e., cation-pi and pi-pi packing) substantially interfered with ABTS(center dot+) /DPPH center dot scavenging events when compared to the aromatic residues. Semi-quantitative peptidomics and molecular simulation/docking revealed that VFSSQGQSELILLQK and LCPSPDGLYL are two potential antioxidant peptides at the late ripening-drying. They had distinctive self-folding destinies following solvation owing to varying charged/hydrophobic properties of termini and hydrogen atom donor, allowing different flexibility of backbone and interactive surface towards free radicals ex situ followed by electron/proton transfer.