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Title: An unusual xylan in Arabidopsis primary cell walls is synthesised by GUX3, IRX9L, IRX10L and IRX14

Abstract

Xylan is a crucial component of many plant primary and secondary cell walls. However, the structure and function of xylan in the dicotyledon primary cell wall is not well understood. Here, we characterized a xylan that is specific to tissues enriched in Arabidopsis primary cell walls. Unlike previously described xylans, this xylan carries a pentose linked 1-2 to the α-1,2-d-glucuronic acid (GlcA) side chains on the β-1,4-Xyl backbone. The frequent and precisely regular spacing of GlcA substitutions every six xylosyl residues along the backbone is also unlike that previously observed in secondary cell wall xylan. Molecular genetics, in vitro assays, and expression data suggest that IRX9L, IRX10L and IRX14 are required for xylan backbone synthesis in primary cell wall synthesising tissues. IRX9 and IRX10 are not involved in the primary cell wall xylan synthesis but are functionally exchangeable with IRX9L and IRX10L. GUX3 is the only glucuronyltransferase required for the addition of the GlcA decorations on the xylan. The differences in xylan structure in primary versus secondary cell walls might reflect the different roles in cross-linking and interaction with other cell wall components. Significance Statement We have characterised a previously unreported type of xylan, which is a hemicellulose, in themore » Arabidopsis primary cell wall and shown that GUX3 is specifically responsible for adding the GlcA side chains with a precise spacing pattern. In addition, we have shown that only a subset of the known proteins responsible for xylan backbone elongation, IRX9L, IRX10L and IRX14, are necessary to synthesise this xylan.« less

Authors:
 [1];  [2];  [2];  [2];  [2];  [2];  [2];  [2];  [2];  [2]
  1. Univ. of Cambridge, Cambridge (United Kingdom). Dept. of Biochemistry; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Physical Biosciences Div.
  2. Univ. of Cambridge, Cambridge (United Kingdom). Dept. of Biochemistry.
Publication Date:
Research Org.:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Biological and Environmental Research (BER)
OSTI Identifier:
1213058
Alternate Identifier(s):
OSTI ID: 1407271
Grant/Contract Number:  
AC02-05CH11231; BB/G016240/1; 251132; BB/K005537/1
Resource Type:
Accepted Manuscript
Journal Name:
The Plant Journal
Additional Journal Information:
Journal Volume: 83; Journal Issue: 3; Journal ID: ISSN 0960-7412
Publisher:
Society for Experimental Biology
Country of Publication:
United States
Language:
English
Subject:
59 BASIC BIOLOGICAL SCIENCES; Xylan; IRX10L; IRX9L; IRX14; GUX3; primary wall; Arabidopsis thaliana

Citation Formats

Mortimer, Jenny C., Faria-Blanc, Nuno, Yu, Xiaolan, Tryfona, Theodora, Sorieul, Mathias, Ng, Yao Z., Zhang, Zhinong, Stott, Katherine, Anders, Nadine, and Dupree, Paul. An unusual xylan in Arabidopsis primary cell walls is synthesised by GUX3, IRX9L, IRX10L and IRX14. United States: N. p., 2015. Web. doi:10.1111/tpj.12898.
Mortimer, Jenny C., Faria-Blanc, Nuno, Yu, Xiaolan, Tryfona, Theodora, Sorieul, Mathias, Ng, Yao Z., Zhang, Zhinong, Stott, Katherine, Anders, Nadine, & Dupree, Paul. An unusual xylan in Arabidopsis primary cell walls is synthesised by GUX3, IRX9L, IRX10L and IRX14. United States. https://doi.org/10.1111/tpj.12898
Mortimer, Jenny C., Faria-Blanc, Nuno, Yu, Xiaolan, Tryfona, Theodora, Sorieul, Mathias, Ng, Yao Z., Zhang, Zhinong, Stott, Katherine, Anders, Nadine, and Dupree, Paul. Thu . "An unusual xylan in Arabidopsis primary cell walls is synthesised by GUX3, IRX9L, IRX10L and IRX14". United States. https://doi.org/10.1111/tpj.12898. https://www.osti.gov/servlets/purl/1213058.
@article{osti_1213058,
title = {An unusual xylan in Arabidopsis primary cell walls is synthesised by GUX3, IRX9L, IRX10L and IRX14},
author = {Mortimer, Jenny C. and Faria-Blanc, Nuno and Yu, Xiaolan and Tryfona, Theodora and Sorieul, Mathias and Ng, Yao Z. and Zhang, Zhinong and Stott, Katherine and Anders, Nadine and Dupree, Paul},
abstractNote = {Xylan is a crucial component of many plant primary and secondary cell walls. However, the structure and function of xylan in the dicotyledon primary cell wall is not well understood. Here, we characterized a xylan that is specific to tissues enriched in Arabidopsis primary cell walls. Unlike previously described xylans, this xylan carries a pentose linked 1-2 to the α-1,2-d-glucuronic acid (GlcA) side chains on the β-1,4-Xyl backbone. The frequent and precisely regular spacing of GlcA substitutions every six xylosyl residues along the backbone is also unlike that previously observed in secondary cell wall xylan. Molecular genetics, in vitro assays, and expression data suggest that IRX9L, IRX10L and IRX14 are required for xylan backbone synthesis in primary cell wall synthesising tissues. IRX9 and IRX10 are not involved in the primary cell wall xylan synthesis but are functionally exchangeable with IRX9L and IRX10L. GUX3 is the only glucuronyltransferase required for the addition of the GlcA decorations on the xylan. The differences in xylan structure in primary versus secondary cell walls might reflect the different roles in cross-linking and interaction with other cell wall components. Significance Statement We have characterised a previously unreported type of xylan, which is a hemicellulose, in the Arabidopsis primary cell wall and shown that GUX3 is specifically responsible for adding the GlcA side chains with a precise spacing pattern. In addition, we have shown that only a subset of the known proteins responsible for xylan backbone elongation, IRX9L, IRX10L and IRX14, are necessary to synthesise this xylan.},
doi = {10.1111/tpj.12898},
journal = {The Plant Journal},
number = 3,
volume = 83,
place = {United States},
year = {Thu Jun 04 00:00:00 EDT 2015},
month = {Thu Jun 04 00:00:00 EDT 2015}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record

Figures / Tables:

Figure 1 Figure 1: Xylan structure in primary cell wall rich tissues. PACE analysis of xylanase (GH11)-digested AIR from mature stem, young stem and roots and respective no-enzyme controls. Xylo-oligosaccharide standard: X1–X5, GH11 only: enzyme only control. Note: PUX5 structure, marked with *, is not present in mature stem, whereas [m]UX4, markedmore » with +, is present in all tissues analysed.« less

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