title: Antimicrobial peptides from the Brazilian frog Phyllomedusa distincta.
abstract: Different peptides were purified by chromatographic procedures from the skin-secretory glands of the frog Phyllomedusa distincta. These are the first peptides reported from this frog species. Their primary structure was determined by a combination of automated Edman degradation and mass spectrometry. Peptide Q2 contains 25 amino acid residues, peptide Q1 and L have 28 each, peptide M contains 31, and peptide K has 33 amino acid residues. They all showed potent antimicrobial activity against Gram-negative and Gram-positive bacteria, presenting minimal inhibitory concentrations from 0.6 to 40 microM, when tested against Enterococcus faecalis, Escherichia coli, Staphylococcus aureus, and Pseudomonas aeruginosa. Peptides K, L, and Q1 were chemically synthesized and shown to be active.
authors.affiliation: Department of Cellular Biology, University of Brasilia, DF, Brazil.
authors.forename: C V
authors.initials: CV
authors.lastname: Batista
authors.forename: L R
authors.initials: LR
authors.lastname: da Silva
authors.forename: A
authors.initials: A
authors.lastname: Sebben
authors.forename: A
authors.initials: A
authors.lastname: Scaloni
authors.forename: L
authors.initials: L
authors.lastname: Ferrara
authors.forename: G R
authors.initials: GR
authors.lastname: Paiva
authors.forename: T
authors.initials: T
authors.lastname: Olamendi-Portugal
authors.forename: L D
authors.initials: LD
authors.lastname: Possani
authors.forename: C
authors.initials: C
authors.lastname: Bloch
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D000900:Anti-Bacterial Agents / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology; D023181:Antimicrobial Cationic Peptides / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology; D001001:Anura; D002851:Chromatography, High Pressure Liquid; D002942:Circular Dichroism; D006090:Gram-Negative Bacteria / Q000187:drug effects; D006094:Gram-Positive Bacteria / Q000187:drug effects; D006461:Hemolysis / Q000187:drug effects; D013058:Mass Spectrometry; D008826:Microbial Sensitivity Tests; D008969:Molecular Sequence Data; D010455:Peptides; D017386:Sequence Homology, Amino Acid; D012867:Skin / Q000737:chemistry*
chemical_list: D000900:Anti-Bacterial Agents; D023181:Antimicrobial Cationic Peptides; D010455:Peptides; C527843:dermadistinctin K, Phyllomedusa distincta