title: RNA-Seq analysis of developing nasturtium seeds (Tropaeolum majus): identification and characterization of an additional galactosyltransferase involved in xyloglucan biosynthesis.
abstract: A deep-sequencing approach was pursued utilizing 454 and Illumina sequencing methods to discover new genes involved in xyloglucan biosynthesis. cDNA sequences were generated from developing nasturtium (Tropaeolum majus) seeds, which produce large amounts of non-fucosylated xyloglucan as a seed storage polymer. In addition to known xyloglucan biosynthetic genes, a previously uncharacterized putative xyloglucan galactosyltransferase was identified. Analysis of an Arabidopsis thaliana mutant line defective in the corresponding ortholog (AT5G62220) revealed that this gene shows no redundancy with the previously characterized xyloglucan galactosyltransferase, MUR3, but is required for galactosyl-substitution of xyloglucan at a different position. The gene was termed XLT2 for Xyloglucan L-side chain galactosylTransferase position 2. It represents an enzyme in the same subclade of glycosyltransferase family 47 as MUR3. A double mutant defective in both MUR3 (mur3.1) and XLT2 led to an Arabidopsis plant with xyloglucan that consists essentially of only xylosylated glucosyl units, with no further substitutions.
authors.affiliation: DOE Great Lakes Bioenergy Research Center, Michigan State University, East Lansing, MI 48824, USA.
authors.forename: Jacob K
authors.initials: JK
authors.lastname: Jensen
authors.forename: Alex
authors.initials: A
authors.lastname: Schultink
authors.forename: Kenneth
authors.initials: K
authors.lastname: Keegstra
authors.forename: Curtis G
authors.initials: CG
authors.lastname: Wilkerson
authors.forename: Markus
authors.initials: M
authors.lastname: Pauly
mesh_terms: D005700:Galactosyltransferases / Q000235:genetics / Q000378:metabolism*; D005936:Glucans / Q000096:biosynthesis*; D059014:High-Throughput Nucleotide Sequencing; D008969:Molecular Sequence Data; D010940:Plant Proteins / Q000235:genetics / Q000378:metabolism*; D018749:RNA, Plant / Q000235:genetics; D012639:Seeds / Q000201:enzymology / Q000235:genetics / Q000254:growth & development* / Q000378:metabolism; D017423:Sequence Analysis, RNA; D032388:Tropaeolum / Q000201:enzymology* / Q000235:genetics* / Q000254:growth & development / Q000378:metabolism; D014990:Xylans / Q000096:biosynthesis*
chemical_list: D005936:Glucans; D010940:Plant Proteins; D018749:RNA, Plant; D014990:Xylans; C029353:xyloglucan; D005700:Galactosyltransferases