RRC ID 3098
Author Cocuron JC, Lerouxel O, Drakakaki G, Alonso AP, Liepman AH, Keegstra K, Raikhel N, Wilkerson CG.
Title A gene from the cellulose synthase-like C family encodes a beta-1,4 glucan synthase.
Journal Proc Natl Acad Sci U S A
Abstract Despite the central role of xyloglucan (XyG) in plant cell wall structure and function, important details of its biosynthesis are not understood. To identify the gene(s) responsible for synthesizing the beta-1,4 glucan backbone of XyG, we exploited a property of nasturtium (Tropaeolum majus) seed development. During the last stages of nasturtium seed maturation, a large amount of XyG is deposited as a reserve polysaccharide. A cDNA library was produced from mRNA isolated during the deposition of XyG, and partial sequences of 10,000 cDNA clones were determined. A single member of the C subfamily from the large family of cellulose synthase-like (CSL) genes was found to be overrepresented in the cDNA library. Heterologous expression of this gene in the yeast Pichia pastoris resulted in the production of a beta-1,4 glucan, confirming that the CSLC protein has glucan synthase activity. The Arabidopsis CSLC4 gene, which is the gene with the highest sequence similarity to the nasturtium CSL gene, is coordinately expressed with other genes involved in XyG biosynthesis. These and other observations provide a compelling case that the CSLC gene family encode proteins that synthesize the XyG backbone.
Volume 104(20)
Pages 8550-5
Published 2007-5-15
DOI 10.1073/pnas.0703133104
PII 0703133104
PMID 17488821
PMC PMC1895987
MeSH Arabidopsis / genetics Arabidopsis Proteins / chemistry Arabidopsis Proteins / genetics Arabidopsis Proteins / metabolism Carbohydrate Metabolism Gene Expression Profiling Gene Expression Regulation, Plant Gene Library Genes, Plant* Glucosyltransferases / chemistry Glucosyltransferases / classification Glucosyltransferases / genetics* Glucosyltransferases / metabolism* Pichia / genetics Protein Transport Reverse Transcriptase Polymerase Chain Reaction Seeds / growth & development Solubility Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization Tobacco / cytology Tobacco / metabolism Transcription, Genetic Tropaeolum / enzymology* Tropaeolum / genetics*
IF 9.412
Times Cited 185
Arabidopsis / Cultured plant cells, genes pda04773