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Updated: Jun 6, 2025

Analyzing Protein Dynamics Using Hydrogen Exchange Mass Spectrometry
Published on: November 29, 2013
Exploration of binding mechanism of whey protein isolate and proanthocyanidin: Spectroscopic analysis and molecular
Danjun Guo1, Cheng Chen1, Qingmei Pan2
1College of Food Science & Engineering, Wuhan Polytechnic University, Wuhan 430023, China; Hubei Key Laboratory for Processing and Transformation of Agricultural Products (Wuhan Polytechnic University), Wuhan 430023, China.
Abstract:
The non-covalent whey protein isolate-proanthocyanidin (WPI-PC) complex was constructed and possessed superior anti-muscle attenuation activity in our previous study. While the non-covalent binding mechanism of WPI and PC remains unclear. The interaction mechanism of whey protein isolate (WPI) and proanthocyanidin (PC) was explored using multispectral analysis and molecular dynamics (MD) simulation. The results indicated that the non-covalent binding of PC and WPI led to fluorescence quenching, causing the conformational changes and microenvironment changes of WPI. The surface hydrophobicity of WPI-PC complex was reduced by 42.36 % compared with WPI (P < 0.05). The hydrogen bond and hydrophobic interaction were involved in the interaction between WPI and PC, and hydrogen bond played a dominant role. The WPI-PC complex was irregular and showed a smaller sheet structure. The PC and WPI remained a stable binding mainly through 15 key residues, especially the energy contribution of LEU 39. Additionally, the flexibility and fluctuation of individual amino acid residues in WPI were altered after binding to PC. It is hoped that this study could provide theoretical basis for the application of WPI and PC in functional foods.
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