title: Identification of a multigene family encoding putative beta-glucan-binding proteins in Medicago truncatula.
abstract: Branched 1,6-1,3-beta-glucans from Phytophthora sojae cell walls represent pathogen-associated molecular patterns (PAMPs) that have been shown to mediate the activation of plant defence reactions in many legumes. In soybean, a receptor protein complex containing a high affinity beta-glucan-binding protein (GBP) was identified and investigated in detail. In the model legume Medicago truncatula, used for functional genomic studies of various plant-microbe interactions, a high-affinity beta-glucan-binding site was characterized biochemically. However, to date, none of the genes encoding GBPs from M. truncatula have been described. Here, we report the identification of four full-length clones encoding putative beta-glucan-binding proteins from M. truncatula, MtGBP1, 2, 3, and 4, composing a multigene family encoding GBP-related proteins in this plant. Differences in expression patterns as well as in regulation on treatment with two different biotic elicitors are demonstrated for the members of the GBP family and for a selection of defence-related genes.
authors.affiliation: Department of Biology I, Botany, Ludwig-Maximilians-University, Menzinger Str. 67, D-80638 München, Germany.
authors.forename: Julie
authors.initials: J
authors.lastname: Leclercq
authors.forename: Judith
authors.initials: J
authors.lastname: Fliegmann
authors.forename: Verena
authors.initials: V
authors.lastname: Tellström
authors.forename: Andreas
authors.initials: A
authors.lastname: Niebel
authors.forename: Julie V
authors.initials: JV
authors.lastname: Cullimore
authors.forename: Karsten
authors.initials: K
authors.lastname: Niehaus
authors.forename: Helge
authors.initials: H
authors.lastname: Küster
authors.forename: Jürgen
authors.initials: J
authors.lastname: Ebel
authors.forename: Axel
authors.initials: A
authors.lastname: Mithöfer
mesh_terms: D000595:Amino Acid Sequence; D002352:Carrier Proteins / Q000737:chemistry / Q000235:genetics*; D002478:Cells, Cultured; D017124:Conserved Sequence; D018506:Gene Expression Regulation, Plant; D037102:Lectins / Q000737:chemistry / Q000235:genetics*; D046913:Medicago truncatula / Q000235:genetics*; D008969:Molecular Sequence Data; D005810:Multigene Family; D020411:Oligonucleotide Array Sequence Analysis; D010802:Phylogeny; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D020133:Reverse Transcriptase Polymerase Chain Reaction; D047071:beta-Glucans / Q000378:metabolism*
chemical_list: D002352:Carrier Proteins; D037102:Lectins; D012333:RNA, Messenger; D047071:beta-Glucans; C037937:glucan-binding proteins