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Title: Overexpression of a Prefoldin β subunit gene reduces biomass recalcitrance in the bioenergy crop Populus

Journal Article · · Plant Biotechnology Journal
DOI: https://doi.org/10.1111/pbi.13254 · OSTI ID:1566924
ORCiD logo [1]; ORCiD logo [2];  [3];  [4]; ORCiD logo [1]; ORCiD logo [1];  [5];  [5];  [5];  [6];  [6];  [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1];  [6]; ORCiD logo [1];  [7]; ORCiD logo [1]; ORCiD logo [1] more »; ORCiD logo [1] « less
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
  3. Univ. of Tennessee, Knoxville, TN (United States)
  4. Univ. of Tennessee, Knoxville, TN (United States); Donghua Univ., Shanghai (China)
  5. ArborGen Inc., Ridgeville, SC (United States)
  6. USDOE Joint Genome Institute (JGI), Walnut Creek, CA (United States)
  7. USDOE Joint Genome Institute (JGI), Walnut Creek, CA (United States); HudsonAlpha Inst. for Biotechnology, Huntsville, AL (United States)

Prefoldin (PFD) is a group II chaperonin that is ubiquitously present in the eukaryotic kingdom. Six subunits (PFD1-6) form a jellyfish-like heterohexameric PFD complex and function in protein folding and cytoskeleton organization. However, little is known about its function in plant cell wall-related processes. Here, we report the functional characterization of a PFD gene from Populus deltoides, designated as PdPFD2.2. There are two copies of PFD2 in Populus, and PdPFD2.2 was ubiquitously expressed with high transcript abundance in the cambial region. PdPFD2.2 can physically interact with DELLA protein RGA1_8g, and its subcellular localization is affected by the interaction. In P. deltoides transgenic plants overexpressing PdPFD2.2, the lignin syringyl/guaiacyl ratio was increased, but cellulose content and crystallinity index were unchanged. In addition, the total released sugar (glucose and xylose) amounts were increased by 7.6% and 6.1%, respectively, in two transgenic lines. Transcriptomic and metabolomic analyses revealed that secondary metabolic pathways, including lignin and flavonoid biosynthesis, were affected by overexpressing PdPFD2.2. A total of eight hub transcription factors (TFs) were identified based on TF binding sites of differentially expressed genes in Populus transgenic plants overexpressing PdPFD2.2. In addition, several known cell wall-related TFs, such as MYB3, MYB4, MYB7, TT8 and XND1, were affected by overexpression of PdPFD2.2. These results suggest that overexpression of PdPFD2.2 can reduce biomass recalcitrance and PdPFD2.2 is a promising target for genetic engineering to improve feedstock characteristics to enhance biofuel conversion and reduce the cost of lignocellulosic biofuel production.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER)
Grant/Contract Number:
AC02-05CH11231; AC05-00OR22725; AC02‐05CH1123; AC02‐05CH11231; AC05‐00OR22725
OSTI ID:
1566924
Alternate ID(s):
OSTI ID: 1561676; OSTI ID: 1566925; OSTI ID: 1616121
Journal Information:
Plant Biotechnology Journal, Vol. 18, Issue 3; ISSN 1467-7644
Publisher:
Society for Experimental Biology; Association of Applied BiologyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 14 works
Citation information provided by
Web of Science

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DELLAs Control Plant Immune Responses by Modulating the Balance of Jasmonic Acid and Salicylic Acid Signaling journal May 2008
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A Gibberellin-Mediated DELLA-NAC Signaling Cascade Regulates Cellulose Synthesis in Rice journal May 2015
A 5-Enolpyruvylshikimate 3-Phosphate Synthase Functions as a Transcriptional Repressor in Populus journal June 2018
Knockdown of a laccase in Populus deltoides confers altered cell wall chemistry and increased sugar release journal April 2016
Biomass Recalcitrance: Engineering Plants and Enzymes for Biofuels Production journal February 2007
Molecular Chaperone Functions in Protein Folding and Proteostasis journal June 2013
WRKY Transcription Factors Involved in Activation of SA Biosynthesis Genes journal January 2011
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Downregulation of GAUT12 in Populus deltoides by RNA silencing results in reduced recalcitrance, increased growth and reduced xylan and pectin in a woody biofuel feedstock journal January 2015
A finalized determinant for complete lignocellulose enzymatic saccharification potential to maximize bioethanol production in bioenergy Miscanthus journal April 2019
Gibberellin regulates Arabidopsis floral development via suppression of DELLA protein function journal March 2004
The Prefoldin Complex Regulates Chromatin Dynamics during Transcription Elongation journal September 2013
Recent Advances in the Transcriptional Regulation of Secondary Cell Wall Biosynthesis in the Woody Plants journal October 2018

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