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Title: Biochemical and physiological characterization of fut4 and fut6 mutants defective in arabinogalactan-protein fucosylation in Arabidopsis

Abstract

Arabinogalactan-proteins (AGPs) are highly glycosylated hydroxyproline-rich glycoproteins present in plant cell walls. AGPs are characterized by arabinose-/galactose-rich side chains, which define their interactive molecular surface. Fucose residues are found in some dicotyledon AGPs, and AGP fucosylation is developmentally regulated. We previously identified Arabidopsis thaliana FUT4 and FUT6 genes as AGP-specific fucosyltransferases (FUTs) based on their enzymatic activities when heterologously expressed in tobacco (Nicotiana tabacum) BY2 suspension-cultured cells. Here, the functions of FUT4 and FUT6 and the physiological roles of fucosylated AGPs were further investigated using Arabidopsis fut4, fut6, and fut4/fut6 mutant plants. All mutant plants showed no phenotypic differences compared to wild-type plants under physiological conditions, but showed reduced root growth in the presence of elevated NaCl. However, roots of wild-type and fut4 mutant plants contained terminal fucose epitopes, which were absent in fut6 and fut4/fut6 mutant plants as indicated by eel lectin staining. Monosaccharide analysis showed fucose was present in wild-type leaf and root AGPs, but absent in fut4 leaf AGPs and in fut4/fut6 double mutant leaf and root AGPs, indicating that FUT4 was required for fucosylation of leaf AGPs while both FUT4 and FUT6 contributed to fucosylation of root AGPs. Glycome profiling of cell wall fractions from mutantmore » roots and leaves showed distinct glycome profiles compared to wild-type plants, indicating that fucosyl residues on AGPs may regulate intermolecular interactions between AGPs and other wall components. The current work exemplifies the possibilities of refinement of cell wall structures by manipulation of a single or a few cell wall biosynthetic genes.« less

Authors:
 [1];  [2];  [3];  [4];  [4];  [5];  [2];  [6];  [2]
  1. Ohio Univ., Athens, OH (United States). Dept. of Environmental and Plant Biology; Ohio Univ., Athens, OH (United States). Molecular and Cellular Biology Program; Joint BioEnergy Institute (JBEI), Emeryville, CA (United States)
  2. Ohio Univ., Athens, OH (United States). Dept. of Environmental and Plant Biology; Ohio Univ., Athens, OH (United States). Molecular and Cellular Biology Program
  3. Univ. of Georgia, Athens, GA (United States). Complex Carbohydrate Research Center
  4. Ohio Univ., Athens, OH (United States). Dept. of Environmental and Plant Biology
  5. SAS Inst., Cary, NC (United States)
  6. Univ. of Georgia, Athens, GA (United States). Complex Carbohydrate Research Center; Univ. of Georgia, Athens, GA (United States). Dept. of Plant Biology
Publication Date:
Research Org.:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC)
Sponsoring Org.:
USDOE Office of Science (SC), Biological and Environmental Research (BER). Biological Systems Science Division; USDA; National Science Foundation (NSF)
OSTI Identifier:
1625382
Grant/Contract Number:  
AC02-05CH11231; PS02-06ER64304; 2008-35318-04563; 2008-35318-04572; DBI-0421683
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Experimental Botany
Additional Journal Information:
Journal Volume: 64; Journal Issue: 18; Journal ID: ISSN 0022-0957
Publisher:
Oxford University Press
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; plant sciences; arabidopsis; arabinogalactan-proteins; fucosyltransferase; glycosylation; hydroxyproline-rich proteins; plant cell wall

Citation Formats

Liang, Yan, Basu, Debarati, Pattathil, Sivakumar, Xu, Wen-liang, Venetos, Alexandra, Martin, Stanton L., Faik, Ahmed, Hahn, Michael G., and Showalter, Allan M. Biochemical and physiological characterization of fut4 and fut6 mutants defective in arabinogalactan-protein fucosylation in Arabidopsis. United States: N. p., 2013. Web. doi:10.1093/jxb/ert321.
Liang, Yan, Basu, Debarati, Pattathil, Sivakumar, Xu, Wen-liang, Venetos, Alexandra, Martin, Stanton L., Faik, Ahmed, Hahn, Michael G., & Showalter, Allan M. Biochemical and physiological characterization of fut4 and fut6 mutants defective in arabinogalactan-protein fucosylation in Arabidopsis. United States. https://doi.org/10.1093/jxb/ert321
Liang, Yan, Basu, Debarati, Pattathil, Sivakumar, Xu, Wen-liang, Venetos, Alexandra, Martin, Stanton L., Faik, Ahmed, Hahn, Michael G., and Showalter, Allan M. Mon . "Biochemical and physiological characterization of fut4 and fut6 mutants defective in arabinogalactan-protein fucosylation in Arabidopsis". United States. https://doi.org/10.1093/jxb/ert321. https://www.osti.gov/servlets/purl/1625382.
@article{osti_1625382,
title = {Biochemical and physiological characterization of fut4 and fut6 mutants defective in arabinogalactan-protein fucosylation in Arabidopsis},
author = {Liang, Yan and Basu, Debarati and Pattathil, Sivakumar and Xu, Wen-liang and Venetos, Alexandra and Martin, Stanton L. and Faik, Ahmed and Hahn, Michael G. and Showalter, Allan M.},
abstractNote = {Arabinogalactan-proteins (AGPs) are highly glycosylated hydroxyproline-rich glycoproteins present in plant cell walls. AGPs are characterized by arabinose-/galactose-rich side chains, which define their interactive molecular surface. Fucose residues are found in some dicotyledon AGPs, and AGP fucosylation is developmentally regulated. We previously identified Arabidopsis thaliana FUT4 and FUT6 genes as AGP-specific fucosyltransferases (FUTs) based on their enzymatic activities when heterologously expressed in tobacco (Nicotiana tabacum) BY2 suspension-cultured cells. Here, the functions of FUT4 and FUT6 and the physiological roles of fucosylated AGPs were further investigated using Arabidopsis fut4, fut6, and fut4/fut6 mutant plants. All mutant plants showed no phenotypic differences compared to wild-type plants under physiological conditions, but showed reduced root growth in the presence of elevated NaCl. However, roots of wild-type and fut4 mutant plants contained terminal fucose epitopes, which were absent in fut6 and fut4/fut6 mutant plants as indicated by eel lectin staining. Monosaccharide analysis showed fucose was present in wild-type leaf and root AGPs, but absent in fut4 leaf AGPs and in fut4/fut6 double mutant leaf and root AGPs, indicating that FUT4 was required for fucosylation of leaf AGPs while both FUT4 and FUT6 contributed to fucosylation of root AGPs. Glycome profiling of cell wall fractions from mutant roots and leaves showed distinct glycome profiles compared to wild-type plants, indicating that fucosyl residues on AGPs may regulate intermolecular interactions between AGPs and other wall components. The current work exemplifies the possibilities of refinement of cell wall structures by manipulation of a single or a few cell wall biosynthetic genes.},
doi = {10.1093/jxb/ert321},
journal = {Journal of Experimental Botany},
number = 18,
volume = 64,
place = {United States},
year = {Mon Oct 14 00:00:00 EDT 2013},
month = {Mon Oct 14 00:00:00 EDT 2013}
}

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Works referencing / citing this record:

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