Plant defense peptide (Probable). Disrupts membranes containing phosphatidic acid (PA) via a PA-dependent oligomerization process. In the presence of phosphatidic acid (PA), forms right-handed double helices which tend to bundle into fibrils. Each helix is a repetition of dimers containing 2 bound molecules of PA per dimer. Dimers are arranged orthogonally in a tip-to-tip configuration with 1 molecule of PA located at the dimer contact interface. Association of 2 helices to form a double helix depends on intercalating isoleucine residues Ile-15 and Ile-37. Bundling of double helices into fibrils depends on Arg-26. Belongs to the DEFL family.