title: Antibiotic activity of antimicrobial peptide against Pseudomonads isolated from a patient with gallstones.
abstract: We investigated the in vitro antibiotic activity of the 19-amino acid antimicrobial peptide HP (2-20), derived from the N-terminus of Helicobacter pylori Ribosomal Protein L1 (RPL1), against antibiotic susceptible and resistant pathogens from a patient with gallstones. HP (2-20) was active against antibiotic-susceptible and antibiotic-resistant clinical isolates of pathogens from a patient with gallstones, but this peptide showed no hemolytic activity against normal human erythrocytes. HP (2-20) acted synergistically with ciprofloxacin against pathogenic bacteria. Fluorescence activated flow cytometry revealed that the effect of HP (2-20) was dependent on energy and salt concentration. In addition, scanning electron microscopy showed that HP (2-20) caused significant morphological alterations to the cell surface of pathogens. Using 16S rDNA sequences, we found that isolates from bile were 100% homologous to Pseudomonas aeruginosa. These findings suggest that HP (2-20) may be useful clinically as an antibiotic against acquired pathogens from patients with gallstones and against pathogens resistant to other antibiotics.
authors.affiliation: Research Center for Proteineous Materials (RCPM), Chosun University, 375 Seosuk-Dong, Kwangju 501-759, Korea.
authors.forename: Yoonkyung
authors.initials: Y
authors.lastname: Park
authors.forename: Joon Soo
authors.initials: JS
authors.lastname: Hahm
authors.forename: Kyung-Soo
authors.initials: KS
authors.lastname: Hahm
mesh_terms: D000900:Anti-Bacterial Agents / Q000494:pharmacology*; D001483:Base Sequence; D017931:DNA Primers; D004275:DNA, Ribosomal / Q000235:genetics; D005434:Flow Cytometry; D042882:Gallstones / Q000382:microbiology*; D006461:Hemolysis / Q000187:drug effects; D006801:Humans; D008826:Microbial Sensitivity Tests; D008855:Microscopy, Electron, Scanning; D010455:Peptides / Q000494:pharmacology*; D011549:Pseudomonas / Q000187:drug effects* / Q000235:genetics / Q000302:isolation & purification; D012336:RNA, Ribosomal, 16S / Q000235:genetics
chemical_list: D000900:Anti-Bacterial Agents; D017931:DNA Primers; D004275:DNA, Ribosomal; D010455:Peptides; D012336:RNA, Ribosomal, 16S