title: Role of acetylation and charge in antimicrobial peptides based on human beta-defensin-3.
abstract: Cationic antimicrobial peptides are an evolutionarily ancient and essential element of innate immunity in higher organisms. The precise mechanism by which these peptides exert their antimicrobial activity on bacteria is not well understood. Decapeptides based on the C-terminus of human beta-defensin-3 were designed and evaluated to study the role of charge in defining the antimicrobial activity and selectivity of these peptides against Escherichia coli. Acetylated derivatives of these peptides were prepared in order to further evaluate how positively charged primary amines contribute to potency in these small antimicrobial peptides. These peptides enabled us to explore the relationship between net charge, charge distribution and antimicrobial activity. While the results indicate that net charge is a major factor in antimicrobial activity in these peptides, the actual relationship between charge and potency appears to be more complex.
authors: Department of Chemistry and Biochemistry, George Mason University, Fairfax, VA 22030, USA.
authors: Emilios Andrew
authors: EA
authors: Papanastasiou
authors: Quyen
authors: Q
authors: Hua
authors: Aline
authors: A
authors: Sandouk
authors: U Hyon
authors: UH
authors: Son
authors: Andrew James
authors: AJ
authors: Christenson
authors: Monique Louise
authors: ML
authors: Van Hoek
authors: Barney Michael
authors: BM
authors: Bishop
mesh_terms: D000107:Acetylation; D000595:Amino Acid Sequence; D000890:Anti-Infective Agents / Q000138:chemical synthesis / Q000737:chemistry* / Q000494:pharmacology*; D023181:Antimicrobial Cationic Peptides / Q000138:chemical synthesis / Q000737:chemistry* / Q000494:pharmacology*; D004927:Escherichia coli Infections / Q000188:drug therapy; D048168:Escherichia coli K12 / Q000187:drug effects; D006461:Hemolysis / Q000502:physiology; D006801:Humans; D008826:Microbial Sensitivity Tests; D008969:Molecular Sequence Data; D017433:Protein Structure, Secondary; D013329:Structure-Activity Relationship; D023083:beta-Defensins / Q000737:chemistry*
chemical_list: D000890:Anti-Infective Agents; D023181:Antimicrobial Cationic Peptides; C422950:DEFB103A protein, human; D023083:beta-Defensins