title: The secrets of dermcidin action.
abstract: Antimicrobial peptides (AMPs) are important effector molecules of the innate immune defense of diverse species. The majority of known AMPs are cationic therefore facilitating the initial binding of the positively charged peptides to the negatively charged bacterial membrane. Dermcidin (DCD) is constitutively expressed in eccrine sweat glands, secreted into sweat and transported to the epidermal surface where it is proteolytically processed giving rise to several truncated DCD peptides. Its processed forms such as the anionic 48mer DCD-1L and the 47mer DCD-1 possess antimicrobial activity against numerous bacteria including Staphylococcus aureus. Here, the latest knowledge regarding the mode of action of the anionic DCD-1(L) and the functional consequences of their interaction with bacterial membranes is reviewed. There is evidence that the interaction of DCD-1(L) with negatively charged bacterial phospholipids leads to Zn(2+) dependent formation of oligomeric complexes in the bacterial membrane, which subsequently leads to ion channel formation resulting in membrane depolarization and bacterial cell death.
authors.affiliation: Department of Dermatology, Eberhard-Karls-University Tübingen, Tübingen, Germany.
authors.forename: Marc
authors.initials: M
authors.lastname: Burian
authors.affiliation: Department of Dermatology, Eberhard-Karls-University Tübingen, Tübingen, Germany. Electronic address: birgit.schittek@med.uni-tuebingen.de.
authors.forename: Birgit
authors.initials: B
authors.lastname: Schittek
mesh_terms: D000818:Animals; D023181:Antimicrobial Cationic Peptides / Q000378:metabolism*; D001419:Bacteria / Q000187:drug effects*; D002462:Cell Membrane / Q000378:metabolism*; D006801:Humans; D007473:Ion Channels / Q000378:metabolism; D050296:Microbial Viability / Q000187:drug effects; D010455:Peptides / Q000378:metabolism*; D010743:Phospholipids / Q000378:metabolism; D055503:Protein Multimerization
chemical_list: D023181:Antimicrobial Cationic Peptides; D007473:Ion Channels; D010455:Peptides; D010743:Phospholipids; C442243:dermcidin
keywords: Antimicrobial peptides; Dermcidin; Ion channel; Oligomerization; Staphylococcus aureus