title: Diversity of wheat anti-microbial peptides.
abstract: From seeds of Triticum kiharae Dorof. et Migusch., 24 novel anti-microbial peptides were isolated and characterized by a combination of three-step HPLC (affinity, size-exclusion and reversed-phase) with matrix-assisted laser-desorption/ionization time-of-flight (MALDI-TOF) mass spectrometry and Edman degradation. Based on sequence similarity and cysteine motifs, partially sequenced peptides were assigned to 7 families: defensins, thionins, lipid-transfer proteins, hevein-like peptides, knottin-like peptides, glycine-rich peptides, and MBP-1 homologs. A novel subfamily of defensins consisting of 6 peptides and a new family of glycine-rich (8 peptides with different repeat motifs) were identified. Three 6-cysteine knottin-like peptides represented by N- and C-terminally truncated variants revealed no sequence homology to any known plant anti-microbial peptides. A new 8-cysteine hevein-like peptide and three 4-cysteine peptides homologous to MBP-1 from maize were isolated. This is the first communication on the occurrence of nearly all families of plant anti-microbial peptides in a single species.
authors.affiliation: Group of Antimicrobial Peptides, Laboratory of Neuroreceptors and Neuroregulators, Shemyakin and Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, ul. Miklukho-Maklaya 16/10, 117997 Moscow, Russian Federation. ego@ibch.ru
authors.forename: Tsezi A
authors.initials: TA
authors.lastname: Egorov
authors.forename: Tatyana I
authors.initials: TI
authors.lastname: Odintsova
authors.forename: Vitaliy A
authors.initials: VA
authors.lastname: Pukhalsky
authors.forename: Eugene V
authors.initials: EV
authors.lastname: Grishin
mesh_terms: D000890:Anti-Infective Agents / Q000737:chemistry* / Q000145:classification / Q000302:isolation & purification; D002851:Chromatography, High Pressure Liquid; D010455:Peptides / Q000737:chemistry* / Q000145:classification / Q000302:isolation & purification; D010940:Plant Proteins / Q000737:chemistry* / Q000302:isolation & purification / Q000494:pharmacology; D012639:Seeds / Q000737:chemistry*; D020539:Sequence Analysis, Protein; D017386:Sequence Homology, Amino Acid; D014908:Triticum / Q000737:chemistry*
chemical_list: D000890:Anti-Infective Agents; D010455:Peptides; D010940:Plant Proteins