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Title: Degradation of lignin β-aryl ether units in Arabidopsis thaliana expressing LigD , LigF and LigG from Sphingomonas paucimobilis SYK-6

Journal Article · · Plant Biotechnology Journal
DOI:https://doi.org/10.1111/pbi.12655· OSTI ID:1393489
 [1];  [2];  [2];  [3];  [3];  [4];  [1];  [1];  [2];  [3];  [1];  [5];  [1];  [5]
  1. Univ. of Copenhagen, Frederiksberg C (Denmark)
  2. Ghent Univ., Ghent (Belgium); VIB, Ghent (Belgium)
  3. Wisconsin Energy Institute, Madison, WI (United States)
  4. VIB, Ghent (Belgium)
  5. Univ. of Copenhagen, Frederiksberg C (Denmark); Carlsberg Research Lab., Copenhagen (Denmark)

Here, lignin is a major polymer in the secondary plant cell wall and composed of hydrophobic interlinked hydroxyphenylpropanoid units. The presence of lignin hampers conversion of plant biomass into biofuels; plants with modified lignin are therefore being investigated for increased digestibility. The bacterium Sphingomonas paucimobilis produces lignin-degrading enzymes including LigD, LigF and LigG involved in cleaving the most abundant lignin interunit linkage, the β-aryl ether bond. In this study, we expressed the LigD, LigF and LigG (LigDFG) genes in Arabidopsis thaliana to introduce postlignification modifications into the lignin structure. The three enzymes were targeted to the secretory pathway. Phenolic metabolite profiling and 2D HSQC NMR of the transgenic lines showed an increase in oxidized guaiacyl and syringyl units without concomitant increase in oxidized β-aryl ether units, showing lignin bond cleavage. Saccharification yield increased significantly in transgenic lines expressing LigDFG, showing the applicability of our approach. Additional new information on substrate specificity of the LigDFG enzymes is also provided.

Research Organization:
Wisconsin Energy Institute, Madison, WI (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
FC02-07ER64494
OSTI ID:
1393489
Journal Information:
Plant Biotechnology Journal, Vol. 15, Issue 5; ISSN 1467-7644
Publisher:
Society for Experimental Biology; Association of Applied BiologyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 24 works
Citation information provided by
Web of Science

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Cited By (5)

Emerging tools, enabling technologies, and future opportunities for the bioproduction of aromatic chemicals: Emerging tools, enabling technologies, and future opportunities journal August 2018
Introducing curcumin biosynthesis in Arabidopsis enhances lignocellulosic biomass processing journal January 2019
Phenolic cross-links: building and de-constructing the plant cell wall journal January 2020
RNAi-suppression of barley caffeic acid O -methyltransferase modifies lignin despite redundancy in the gene family journal October 2018
Biodegradation of lignin by Pseudomonas sp. Q18 and the characterization of a novel bacterial DyP-type peroxidase journal July 2018

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