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Title: Discovery of a novel amino acid racemase through exploration of natural variation in Arabidopsis thaliana

Journal Article · · Proceedings of the National Academy of Sciences of the United States of America
 [1];  [2];  [2];  [2];  [1]
  1. North Carolina State Univ., Kannapolis, NC (United States); North Carolina State Univ., Raleigh, NC (United States)
  2. Purdue Univ., West Lafayette, IN (United States)

Plants produce diverse low-molecular-weight compounds via specialized metabolism. Discovery of the pathways underlying production of these metabolites is an important challenge for harnessing the huge chemical diversity and catalytic potential in the plant kingdom for human uses, but this effort is often encumbered by the necessity to initially identify compounds of interest or purify a catalyst involved in their synthesis. Here, as an alternative approach, we have performed untargeted metabolite profiling and genome-wide association analysis on 440 natural accessions of Arabidopsis thaliana. This approach allowed us to establish genetic linkages between metabolites and genes. Investigation of one of the metabolite-gene associations led to the identification of N-malonyl-D-allo-isoleucine, and the discovery of a novel amino acid racemase involved in its biosynthesis. This finding provides, to our knowledge, the first functional characterization of a eukaryotic member of a large and widely conserved phenazine biosynthesis protein PhzF-like protein family. Unlike most of known eukaryotic amino acid racemases, the newly discovered enzyme does not require pyridoxal 5'-phosphate for its activity. In conclusion, this study thus identifies a new d-amino acid racemase gene family and advances our knowledge of plant d-amino acid metabolism that is currently largely unexplored. As a result, it also demonstrates that exploitation of natural metabolic variation by integrating metabolomics with genome-wide association is a powerful approach for functional genomics study of specialized metabolism.

Research Organization:
Purdue Univ., West Lafayette, IN (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
FG02-07ER15905
OSTI ID:
1348406
Journal Information:
Proceedings of the National Academy of Sciences of the United States of America, Vol. 112, Issue 37; ISSN 0027-8424
Publisher:
National Academy of SciencesCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 45 works
Citation information provided by
Web of Science

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Cited By (19)

Exploiting natural variation for accelerating discoveries in plant specialized metabolism journal August 2017
Combined Use of Genome-Wide Association Data and Correlation Networks Unravels Key Regulators of Primary Metabolism in Arabidopsis thaliana journal October 2016
A Guide to Genome-Wide Association Mapping in Plants: Genome-Wide Association Mapping in Plants journal March 2017
PLP-independent racemization: mechanistic and mutational studies of O -ureidoserine racemase (DcsC) journal January 2018
Metabolic GWAS-based dissection of genetic bases underlying the diversity of plant metabolism journal November 2018
AraPheno and the AraGWAS Catalog 2020: a major database update including RNA-Seq and knockout mutation data for Arabidopsis thaliana text January 2020
D-amino acids in nature, agriculture and biomedicine journal May 2019
AraPheno and the AraGWAS Catalog 2020: a major database update including RNA-Seq and knockout mutation data for Arabidopsis thaliana journal October 2019
Metabolomics for Plant Improvement: Status and Prospects journal August 2017
Stimulation of root growth and enhanced nitrogenous metabolite content in habanero pepper (Capsicum chinense Jacq.) treated with a d-amino acid mixture journal January 2020
A gene encoding maize caffeoyl-CoA O-methyltransferase confers quantitative resistance to multiple pathogens journal July 2017
Bioprospecting Plant Growth-Promoting Rhizobacteria That Mitigate Drought Stress in Grasses journal September 2019
Discovering variation of secondary metabolite diversity and its relationship with disease resistance in Cornus florida L. journal May 2018
Catalytic mechanism and properties of pyridoxal 5′-phosphate independent racemases: how enzymes alter mismatched acidity and basicity journal January 2019
Comprehensive transcriptome analyses correlated with untargeted metabolome reveal differentially expressed pathways in response to cell wall alterations journal March 2018
Ultrahigh resolution metabolomics for S-containing metabolites journal February 2017
Genetic dissection of metabolite variation in Arabidopsis seeds: evidence for mQTL hotspots and a master regulatory locus of seed metabolism journal March 2017
AtDAT1 is a key enzyme of D-amino acid stimulated ethylene production in Arabidopsis thaliana journal July 2019
D-Amino Acids in Plants: New Insights and Aspects, but also More Open Questions book June 2017