title: Antimicrobial peptide melittin against Xanthomonas oryzae pv. oryzae, the bacterial leaf blight pathogen in rice.
abstract: Xanthomonas oryzae pv. oryzae is a destructive bacterial disease of rice, and the development of an environmentally safe bactericide is urgently needed. Antimicrobial peptides, as antibacterial sources, may play important roles in bactericide development. In the present study, we found that the antimicrobial peptide melittin had the desired antibacterial activity against X. oryzae pv. oryzae. The antibacterial mechanism was investigated by examining its effects on cell membranes, energy metabolism, and nucleic acid, and protein synthesis. The antibacterial effects arose from its ability to interact with the bacterial cell wall and disrupt the cytoplasmic membrane by making holes and channels, resulting in the leakage of the cytoplasmic content. Additionally, melittin is able to permeabilize bacterial membranes and reach the cytoplasm, indicating that there are multiple mechanisms of antimicrobial action. DNA/RNA binding assay suggests that melittin may inhibit macromolecular biosynthesis by binding intracellular targets, such as DNA or RNA, and that those two modes eventually lead to bacterial cell death. Melittin can inhibit X. oryzae pv. oryzae from spreading, alleviating the disease symptoms, which indicated that melittin may have potential applications in plant protection.
authors.affiliation: Jiangsu Province Key Laboratory for Molecular and Medical Biotechnology, Life Sciences College, Nanjing Normal University, Nanjing, 210023, China.
authors.forename: Wei
authors.initials: W
authors.lastname: Shi
authors.affiliation: Jiangsu Province Key Laboratory for Molecular and Medical Biotechnology, Life Sciences College, Nanjing Normal University, Nanjing, 210023, China.
authors.forename: Caiyun
authors.initials: C
authors.lastname: Li
authors.affiliation: Jiangsu Province Key Laboratory for Molecular and Medical Biotechnology, Life Sciences College, Nanjing Normal University, Nanjing, 210023, China.
authors.forename: Man
authors.initials: M
authors.lastname: Li
authors.affiliation: Jiangsu Province Key Laboratory for Molecular and Medical Biotechnology, Life Sciences College, Nanjing Normal University, Nanjing, 210023, China.
authors.forename: Xicui
authors.initials: X
authors.lastname: Zong
authors.affiliation: Jiangsu Province Key Laboratory for Molecular and Medical Biotechnology, Life Sciences College, Nanjing Normal University, Nanjing, 210023, China.
authors.forename: Dongju
authors.initials: D
authors.lastname: Han
authors.affiliation: Jiangsu Province Key Laboratory for Molecular and Medical Biotechnology, Life Sciences College, Nanjing Normal University, Nanjing, 210023, China. yuqingchen515@yahoo.com.
authors.forename: Yuqing
authors.initials: Y
authors.lastname: Chen
mesh_terms: D002473:Cell Wall / Q000737:chemistry / Q000187:drug effects; D004269:DNA, Bacterial / Q000737:chemistry; D004591:Electrophoresis, Polyacrylamide Gel; D008555:Melitten / Q000494:pharmacology*; D018613:Microscopy, Confocal; D008855:Microscopy, Electron, Scanning; D046529:Microscopy, Electron, Transmission; D012275:Oryza / Q000382:microbiology; D010935:Plant Diseases / Q000382:microbiology*; D018515:Plant Leaves / Q000382:microbiology*; D012329:RNA, Bacterial / Q000737:chemistry; D014974:Xanthomonas / Q000187:drug effects*
chemical_list: D004269:DNA, Bacterial; D012329:RNA, Bacterial; D008555:Melitten
keywords: Melittin; Rice; Xanthomonas oryzae pv. oryzae