Mutations of Arabidopsis TBL32 and TBL33 affect xylan acetylation and secondary wall deposition

Yuan, Youxi; Teng, Quincy; Zhong, Ruiqin; Haghighat, Marziyeh; Richardson, Elizabeth A.; Ye, Zheng -Hua; Zhang, Jin -Song

doi:10.1371/journal.pone.0146460

Title: Mutations of Arabidopsis TBL32 and TBL33 affect xylan acetylation and secondary wall deposition

Journal Article · Fri Jan 08 00:00:00 EST 2016 · PLoS ONE

DOI:https://doi.org/10.1371/journal.pone.0146460· OSTI ID:1311573

Yuan, Youxi ^[1]; Teng, Quincy ^[1]; Zhong, Ruiqin ^[1]; Haghighat, Marziyeh ^[1]; Richardson, Elizabeth A. ^[1]; Ye, Zheng -Hua ^[1]; Zhang, Jin -Song ^[2]

Univ. of Georgia, Athens, GA (United States)
Chinese Academy of Sciences (China)

Xylan is a major acetylated polymer in plant lignocellulosic biomass and it can be monoand di-acetylated at O-2 and O-3 as well as mono-acetylated at O-3 of xylosyl residues that is substituted with glucuronic acid (GlcA) at O-2. Based on the finding that ESK1, an Arabidopsis thaliana DUF231 protein, specifically mediates xylan 2-O- and 3-O-monoacetylation, we previously proposed that different acetyltransferase activities are required for regiospecific acetyl substitutions of xylan. Here, we demonstrate the functional roles of TBL32 and TBL33, two ESK1 close homologs, in acetyl substitutions of xylan. Simultaneous mutations of TBL32 and TBL33 resulted in a significant reduction in xylan acetyl content and endoxylanase digestion of the mutant xylan released GlcA-substituted xylooligomers without acetyl groups. Structural analysis of xylan revealed that the tbl32 tbl33 mutant had a nearly complete loss of 3-O-acetylated, 2-O-GlcA-substituted xylosyl residues. A reduction in 3-Omonoacetylated and 2,3-di-O-acetylated xylosyl residues was also observed. Simultaneous mutations of TBL32, TBL33 and ESK1 resulted in a severe reduction in xylan acetyl level down to 15% of that of the wild type, and concomitantly, severely collapsed vessels and stunted plant growth. In particular, the S2 layer of secondary walls in xylem vessels of tbl33 esk1 and tbl32 tbl33 esk1 exhibited an altered structure, indicating abnormal assembly of secondary wall polymers. Furthermore, these results demonstrate that TBL32 and TBL33 play an important role in xylan acetylation and normal deposition of secondary walls.

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Research Organization:: Univ. of Georgia, Athens, GA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: FG02-03ER15415

OSTI ID:: 1311573

Journal Information:: PLoS ONE, Vol. 11, Issue 1; ISSN 1932-6203

Publisher:: Public Library of ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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60 APPLIED LIFE SCIENCES
acetylation
Arabidopsis thaliana
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substitution mutation
flowering plants
plant growth and development
nuclear magnetic resonance
polymers

Title: Mutations of Arabidopsis TBL32 and TBL33 affect xylan acetylation and secondary wall deposition

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