title: Development of a high-throughput screening method using a cell-based, lawn format assay for the identification of novel plant defense activators from combinatorial peptide libraries.
abstract: Plants respond to attack by pathogens through various defense mechanisms. These defense responses are triggered by a variety of molecules derived from pathogenic microorganisms as well as host plants. In this study, we developed a high-throughput screening method using a cell-based lawn format assay for the identification of novel peptides that can induce plant defense responses from combinatorial peptide libraries. Solid-phase peptide libraries were synthesized using a photocleavable linker and immobilized using agarose gel. The peptides were partially cleaved from beads, and the agarose gel was layered on the tobacco cells. The defense response was then observed by detecting the generated H2O2 using a sensitive H2O2 indicator dye, N-(carboxymethylaminocarbonyl)-4,4'-bis(dimethylamino)diphenylamine sodium salt (DA-64). Using this assay format, a 6859-member peptide library based on the sequence of flagellin-derived peptides was screened, and several structural features important for the activity were obtained.
authors.affiliation: Graduate School of Agriculture, Kyoto University, Kyoto 606-8502, Japan. miyamasa@kais.kyoto-u.ac.jp
authors.forename: Masahiro
authors.initials: M
authors.lastname: Miyashita
authors.forename: Yukari
authors.initials: Y
authors.lastname: Otake
authors.forename: Masashi
authors.initials: M
authors.lastname: Oda
authors.forename: Hisashi
authors.initials: H
authors.lastname: Miyagawa
mesh_terms: D000595:Amino Acid Sequence; D002478:Cells, Cultured; D005408:Flagellin / Q000737:chemistry*; D006861:Hydrogen Peroxide / Q000378:metabolism; D019151:Peptide Library; D010935:Plant Diseases / Q000382:microbiology; D010944:Plants / Q000382:microbiology*; D012685:Sepharose; D013329:Structure-Activity Relationship; D014026:Nicotiana / Q000166:cytology / Q000378:metabolism
chemical_list: D019151:Peptide Library; D005408:Flagellin; D012685:Sepharose; D006861:Hydrogen Peroxide