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Title: QUASIMODO 3 (QUA3) is a putative homogalacturonan methyltransferase regulating cell wall biosynthesis in Arabidopsis suspension-cultured cells

Abstract

Pectins are complex polysaccharides that are essential components of the plant cell wall. In this study, a novel putative Arabidopsis S-adenosyl-L-methionine (SAM)-dependent methyltransferase, termed QUASIMODO 3 (QUA3, At4g00740), has been characterized and it was demonstrated that it is a Golgi-localized, type II integral membrane protein that functions in methylesterification of the pectin homogalacturonan (HG). Although transgenic Arabidopsis seedlings with overexpression, or knock-down, of QUA3 do not show altered phenotypes or changes in pectin methylation, this enzyme is highly expressed and abundant in Arabidopsis suspension-cultured cells. In contrast, in cells subjected to QUA3 RNA interference (RNAi) knock-down there is less pectin methylation as well as altered composition and assembly of cell wall polysaccharides. Taken together, these observations point to a Golgi-localized QUA3 playing an essential role in controlling pectin methylation and cell wall biosynthesis in Arabidopsis suspension cell cultures.

Authors:
 [1];  [1];  [1];  [1];  [1]
  1. The Chinese Univ. of Hong Kong (China). Centre for Cell and Developmental Biology. School of Life Sciences
Publication Date:
Research Org.:
Univ. of Georgia, Athens, GA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1625374
Grant/Contract Number:  
FG02-93ER20097; FG05-93ER20097
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Experimental Botany
Additional Journal Information:
Journal Volume: 62; Journal Issue: 14; Journal ID: ISSN 0022-0957
Publisher:
Oxford University Press
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; Plant Sciences; Arabidopsis; cell wall; homogalacturonan; methyltransferase; pectin; plant suspension cultured cells; S-adenosyl-Lmethionine

Citation Formats

Miao, Yansong, Li, Hong-Ye, Shen, Jinbo, Wang, Junqi, and Jiang, Liwen. QUASIMODO 3 (QUA3) is a putative homogalacturonan methyltransferase regulating cell wall biosynthesis in Arabidopsis suspension-cultured cells. United States: N. p., 2011. Web. doi:10.1093/jxb/err211.
Miao, Yansong, Li, Hong-Ye, Shen, Jinbo, Wang, Junqi, & Jiang, Liwen. QUASIMODO 3 (QUA3) is a putative homogalacturonan methyltransferase regulating cell wall biosynthesis in Arabidopsis suspension-cultured cells. United States. https://doi.org/10.1093/jxb/err211
Miao, Yansong, Li, Hong-Ye, Shen, Jinbo, Wang, Junqi, and Jiang, Liwen. Fri . "QUASIMODO 3 (QUA3) is a putative homogalacturonan methyltransferase regulating cell wall biosynthesis in Arabidopsis suspension-cultured cells". United States. https://doi.org/10.1093/jxb/err211. https://www.osti.gov/servlets/purl/1625374.
@article{osti_1625374,
title = {QUASIMODO 3 (QUA3) is a putative homogalacturonan methyltransferase regulating cell wall biosynthesis in Arabidopsis suspension-cultured cells},
author = {Miao, Yansong and Li, Hong-Ye and Shen, Jinbo and Wang, Junqi and Jiang, Liwen},
abstractNote = {Pectins are complex polysaccharides that are essential components of the plant cell wall. In this study, a novel putative Arabidopsis S-adenosyl-L-methionine (SAM)-dependent methyltransferase, termed QUASIMODO 3 (QUA3, At4g00740), has been characterized and it was demonstrated that it is a Golgi-localized, type II integral membrane protein that functions in methylesterification of the pectin homogalacturonan (HG). Although transgenic Arabidopsis seedlings with overexpression, or knock-down, of QUA3 do not show altered phenotypes or changes in pectin methylation, this enzyme is highly expressed and abundant in Arabidopsis suspension-cultured cells. In contrast, in cells subjected to QUA3 RNA interference (RNAi) knock-down there is less pectin methylation as well as altered composition and assembly of cell wall polysaccharides. Taken together, these observations point to a Golgi-localized QUA3 playing an essential role in controlling pectin methylation and cell wall biosynthesis in Arabidopsis suspension cell cultures.},
doi = {10.1093/jxb/err211},
journal = {Journal of Experimental Botany},
number = 14,
volume = 62,
place = {United States},
year = {Fri Jul 01 00:00:00 EDT 2011},
month = {Fri Jul 01 00:00:00 EDT 2011}
}

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