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Title: Dual activity of anthocyanidin reductase supports the dominant plant proanthocyanidin extension unit pathway

Abstract

Proanthocyanidins (PAs) are plant natural products important for agriculture and human health. They are polymers of flavan-3-ol subunits, commonly (-)-epicatechin and/or (+)-catechin, but the source of the in planta extension unit that comprises the bulk of the polymer remains unclear, as does how PA composition is determined in different plant species. Anthocyanidin reductase (ANR) can generate 2,3-cis-epicatechin as a PA starter unit from cyanidin, which itself arises from 2,3-trans-leucocyanidin, but ANR proteins from different species produce mixtures of flavan-3-ols with different stereochemistries in vitro. Genetic and biochemical analyses here show that ANR has dual activity and is involved not only in the production of (-)-epicatechin starter units but also in the formation of 2,3-cis-leucocyanidin to serve as (-)-epicatechin extension units. Differences in the product specificities of ANRs account for the presence/absence of PA polymerization and the compositions of PAs across plant species.

Authors:
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]
  1. Univ. of North Texas, Denton, TX (United States). Dept. of Biological Sciences. BioDiscovery Inst.
Publication Date:
Research Org.:
Univ. of Georgia, Athens, GA (United States); Univ. of Georgia, Athens, GA (United States). Complex Carbohydrate Research Center
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division; USDOE
OSTI Identifier:
1816719
Alternate Identifier(s):
OSTI ID: 1963708
Grant/Contract Number:  
SC0015662
Resource Type:
Accepted Manuscript
Journal Name:
Science Advances
Additional Journal Information:
Journal Volume: 7; Journal Issue: 20; Journal ID: ISSN 2375-2548
Publisher:
AAAS
Country of Publication:
United States
Language:
English
Subject:
59 BASIC BIOLOGICAL SCIENCES

Citation Formats

Jun, Ji Hyung, Lu, Nan, Docampo-Palacios, Maite, Wang, Xiaoqiang, and Dixon, Richard A. Dual activity of anthocyanidin reductase supports the dominant plant proanthocyanidin extension unit pathway. United States: N. p., 2021. Web. doi:10.1126/sciadv.abg4682.
Jun, Ji Hyung, Lu, Nan, Docampo-Palacios, Maite, Wang, Xiaoqiang, & Dixon, Richard A. Dual activity of anthocyanidin reductase supports the dominant plant proanthocyanidin extension unit pathway. United States. https://doi.org/10.1126/sciadv.abg4682
Jun, Ji Hyung, Lu, Nan, Docampo-Palacios, Maite, Wang, Xiaoqiang, and Dixon, Richard A. Sat . "Dual activity of anthocyanidin reductase supports the dominant plant proanthocyanidin extension unit pathway". United States. https://doi.org/10.1126/sciadv.abg4682. https://www.osti.gov/servlets/purl/1816719.
@article{osti_1816719,
title = {Dual activity of anthocyanidin reductase supports the dominant plant proanthocyanidin extension unit pathway},
author = {Jun, Ji Hyung and Lu, Nan and Docampo-Palacios, Maite and Wang, Xiaoqiang and Dixon, Richard A.},
abstractNote = {Proanthocyanidins (PAs) are plant natural products important for agriculture and human health. They are polymers of flavan-3-ol subunits, commonly (-)-epicatechin and/or (+)-catechin, but the source of the in planta extension unit that comprises the bulk of the polymer remains unclear, as does how PA composition is determined in different plant species. Anthocyanidin reductase (ANR) can generate 2,3-cis-epicatechin as a PA starter unit from cyanidin, which itself arises from 2,3-trans-leucocyanidin, but ANR proteins from different species produce mixtures of flavan-3-ols with different stereochemistries in vitro. Genetic and biochemical analyses here show that ANR has dual activity and is involved not only in the production of (-)-epicatechin starter units but also in the formation of 2,3-cis-leucocyanidin to serve as (-)-epicatechin extension units. Differences in the product specificities of ANRs account for the presence/absence of PA polymerization and the compositions of PAs across plant species.},
doi = {10.1126/sciadv.abg4682},
journal = {Science Advances},
number = 20,
volume = 7,
place = {United States},
year = {Sat May 01 00:00:00 EDT 2021},
month = {Sat May 01 00:00:00 EDT 2021}
}

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