Cold Denaturation of Proteins: Where Bioinformatics Meets Thermodynamics to Offer a Mechanistic Understanding: Pea Protein As a Case Study.

Protein structure can be altered with heat, but models which predict denaturation show that globular proteins also spontaneously unfold at low temperatures through cold denaturation. By an analysis of the primary structure of pea protein using bioinformatic modeling, a mechanism of pea protein cold denaturation is proposed. Pea protein is then fractionated into partially purified legumin and vicilin components, suspended in ethanol, and subjected to low temperatures (-10 to -20 °C). The structural characterizations of the purified fractions are conducted through FTIR, ζ potential, dynamic light scattering, and oil binding, and these are compared to the results of commercial protein isolates. The observed structural changes suggest that pea protein undergoes changes in structure as the result of low-temperature treatments, which could lead to innovative industrial processing techniques for functionalization by low-temperature processing.