Lactoferricin: The Antimicrobial Peptide From Milk That's More Potent Than Its Parent Protein

43 new lactoferricin variants were identified from mammalian lactoferrins across six taxonomic families (Primates, Rodentia, Artiodactyla, Perissodactyla, Pholidota, Carnivora), expanding the known LFcin family and its food preservation potential.

Sequence and structural similarity searches of protein databases to identify novel lactoferricin sequences from mammalian lactoferrins. Comprehensive review of LFcin sequences, structures, antimicrobial activities, structural/functional motifs, and food preservation applications.

Antimicrobial resistance and consumer demand for natural food preservatives are both driving the search for new antimicrobial solutions. Lactoferricins — natural peptides from milk — could address both needs: fighting drug-resistant pathogens while serving as clean-label food preservatives.

The food industry is under pressure to replace synthetic preservatives with natural alternatives. Lactoferricins check multiple boxes: they're derived from milk (a familiar, natural source), they're highly effective against foodborne pathogens, and they work through physical mechanisms that are less prone to resistance development than traditional antibiotics. Expanding the LFcin family from a handful to dozens of variants greatly increases the options for optimization.

Bioinformatic identification of new variants requires experimental validation of antimicrobial activity. Most food preservation studies use bovine or human LFcin — the other 43 variants are largely uncharacterized. Practical challenges like peptide stability in food matrices, cost of production, and regulatory approval for food use are not addressed in detail.