1.C.108 The Pore-forming Dermcidin (Dermcidin) Family
Song et al. (2013) presented the X-ray crystal structure as well as solid-state NMR spectroscopy, electrophysiology and MD simulations of human dermcidin (also called preproteolysin) in membranes. These studies revealed the antibiotic mechanism of this major human antimicrobial which suppresses Staphylococcus aureus growth on epidermal surfaces. Dermcidin forms an architecture of high-conductance transmembrane channels, composed of zinc-connected trimers of antiparallel helix pairs. Molecular dynamics simulations elucidated the unusual membrane permeation pathway for ions and showed adjustment of the pore to various membranes. These study unraveled the comprehensive mechanism for the membrane-disruptive action of this mammalian host-defense peptide at the atomic level (Song et al., 2013).