From:  Expanding horizon of antimicrobial peptides: mechanistic complexity and biomedical potential

 Plant antimicrobial peptides.

Peptide typeSourceStructureMechanism of actionExamplesReferences
ThioninsWheat, barley, barley seedsSmall, cysteine-rich, α/β structureMembrane permeabilization; disruption of fungal and bacterial membranesα-Thionin, β-thionin[118]
DefensinsSeeds, leaves, rootsCysteine-rich, β-sheet stabilized by disulfide bondsMembrane disruption; inhibition of fungal and bacterial growth; broad-spectrum activityRs-AFP1, NaD1[119]
LTPsSeeds, leavesSmall, α-helical, cysteine-richMembrane destabilization; binds lipids; inhibits bacterial and fungal growthLTP1, LTP2[120]
CyclotidesClitoria ternatea, Viola spp.Cyclic cystine knot peptidesMembrane disruption; high stability; broad antimicrobial activityKalata B1, cycloviolacin[121]
SnakinsPotato, tomatoCysteine-rich, helical structureMembrane permeabilization; antifungal and antibacterial activitySnakin-1, snakin-2[122]
Hevein-like peptidesHevea brasiliensis, other plantsSmall, cysteine-rich peptidesBind chitin; disrupt fungal cell walls; antifungal activityHevein, Ac-AMP1[123]

LTPs: lipid transfer proteins.