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In vitro activities of antibiotics and antimicrobial peptides against the plant pathogenic bacterium Xylella fastidiosa

All Rights Reserved. In vitro activities of antibiotics and antimicrobial peptides against the plant pathogenic bacterium Xylella fastidiosa. Kuzina, L. V.; Miller, T. A.; Cooksey, D. A. (Department of Plant Pathology, University of California Riverside, Riverside, CA, USA). Letters in Applied Microbiology, 42(5), 514-520 (English) 2006 Blackwell Publishing Ltd. CODEN: LAMIE7. ISSN: 0266-8254. DOCUMENT TYPE: Journal CA Section: 10 (Microbial, Algal, and Fungal Biochemistry) The objective of this study was to evaluate the effectiveness of antibiotics and antimicrobial peptides against 10 strains of Xylella fastidiosa. The minimal inhibitory concn. (MIC) of 12 antibiotics and 18 antimicrobial peptides were detd. by agar diln. tests and growth inhibition assays. Antibiotics with the lowest MIC for X. fastidiosa strains were gentamicin, tetracycline, ampicillin, kanamycin, novobiocin, chloramphenicol, and rifampin. Plate growth inhibition assays showed that four of the antimicrobial peptides (magainin 2, indolicidin, PGQ, and dermaseptin) were toxic to all X. fastidiosa strains. All X. fastidiosa strains were sensitive to several groups of antibiotics, and minor differences in sensitivity to several antimicrobial peptides were obsd. among strains. 171810-31-4 and 136033-70-0 are just another two chemicals used in this study. This study shows that antibiotics and antimicrobial peptides have some activity against the pathogen, X. fastidiosa and may have application in protecting plants from developing Pierce's disease. .

Isolation and biochemical characterization of peptides presenting antimicrobial activity from the skin of Phyllomedusa hypochondrialis

All Rights Reserved. Isolation and biochemical characterization of peptides presenting antimicrobial activity from the skin of Phyllomedusa hypochondrialis. Conceicao, Katia; Konno, Katsuhiro; Richardson, Michael; Antoniazzi, Marta M.; Jared, Carlos; Daffre, Sirlei; Camargo, Antonio Carlos M.; Pimenta, Daniel C. (LETA (Laboratorio Especial de Toxinologia Aplicada), Center for Applied Toxinology (CAT/CEPID), Instituto Butantan, Sao Paulo, SP 05503-900, Brazil). Peptides (New York, NY, United States), 27(12), 3092-3099 (English) 2006 Elsevier Inc. CODEN: PPTDD5. ISSN: 0196-9781. DOCUMENT TYPE: Journal CA Section: 15 (Immunochemistry) Amphibian antimicrobial peptides have been known for many decades and several of them have been isolated from anuran species. Dermaseptins are among the most studied antimicrobial peptides and are found in the skin secretion of tree frogs from the Phyllomedusinae subfamily. These peptides exert a lytic action on bacteria, protozoa, yeast, and filamentous fungi at micromolar concns., but unlike polylysine, present little hemolytic activity. In this work, two antimicrobial peptides were isolated from the crude skin secretion of Phyllomedusa hypochondrialis and tested against Gram-pos.There are some commonly used reagents with their cas registry numbers 920283-29-0 and 136033-70-0 in this article. and Gram-neg. bacteria, presenting no hemolytic activity at the tested concns. One of them was identified with the recently reported peptide PS-7 belonging to the phylloseptin family, and another was a novel peptide, named DPh-1, which was fully purified, sequenced by 'de novo' mass spectrometry and grouped into Dermaseptins (DPh-1). .