How Do Food Compounds Interact with Their Protein Targets? Alternative Modes for Protein Binding

Area of Science:

• Biochemistry
• Structural Biology
• Drug Discovery

Background:

• Understanding food compound mechanisms at the molecular level is crucial for health and drug development.
• Food compounds play a significant role in human health and represent a potential source for novel therapeutics.

Purpose of the Study:

• To systematically analyze food-protein complexes at atomic resolution from the Protein Data Bank.
• To compare binding modes, interaction types, and functional groups of food compounds (fatty lipids vs. others) and drugs.
• To identify unique interaction patterns for different compound classes to inform drug design.

Main Methods:

• Systematic analysis of food-protein and drug-protein complexes in the Protein Data Bank (PDB).
• Categorization of food compounds into fatty lipids (FoodFL) and non-fatty lipids (FoodnoFL).
• Analysis of protein-ligand interaction types, involved functional groups, and partner amino acids.

Main Results:

• All three sets (FoodFL, FoodnoFL, drugs) utilize hydrophobic interactions as dominant, but exhibit distinct binding modes.
• FoodnoFL compounds show high prevalence of hydrogen bonds, salt bridges, cation-π, and metal coordination.
• FoodFL compounds are characterized by high hydrophobic interactions, while drugs exhibit high π-π, cation-π, and halogen bond interactions.

Conclusions:

• Distinct interaction profiles exist between food compounds and proteins, differing from drug-protein interactions.
• Differences arise from functional group composition, usage of interaction types, and amino acid preferences.
• This knowledge can guide the design of new drugs inspired by food compound structures and binding mechanisms.