Down-regulation of kelch domain-containing F-box protein in Arabidopsis enhances the production of (poly)phenols and tolerance to ultraviolet radiation

Zhang, Xuebin; Liu, Chang -Jun; Gou, Mingyue; Guo, Chunrong; Yang, Huijun

doi:10.1104/pp.114.249136

Title: Down-regulation of kelch domain-containing F-box protein in Arabidopsis enhances the production of (poly)phenols and tolerance to ultraviolet radiation

Journal Article · Mon Dec 01 00:00:00 EST 2014 · Plant Physiology (Bethesda)

DOI:https://doi.org/10.1104/pp.114.249136· OSTI ID:1214534

Zhang, Xuebin ^[1]; Liu, Chang -Jun ^[1]; Gou, Mingyue ^[1]; Guo, Chunrong ^[1]; Yang, Huijun ^[1]

Brookhaven National Lab. (BNL), Upton, NY (United States); Shanxi Agriculture Univ., Taigu, Shanxi (People's Republic of China); Stony Brook Univ., Stony Brook, NY (United States)

Phenylpropanoid biosynthesis in plants engenders myriad phenolics with diverse biological functions. Phenylalanine ammonia-lyase (PAL) is the first committed enzyme in the pathway, directing primary metabolic flux into a phenylpropanoid branch. Previously, we demonstrated that the Arabidopsis Kelch-domain containing F-box proteins, AtKFB01, -20, and -50, function as the negative regulators controlling phenylpropanoid biosynthesis via mediating PAL’s ubiquitination and subsequent degradation. Here, we reveal that Arabidopsis KFB39, a close homolog of AtKFB50, also interacts physically with PAL isozymes and modulates PALs' stability and activity. Disturbing the expression of KFB39 reciprocally affects the accumulation/deposition of a set of phenylpropanoid end products, suggesting that KFB39 is an additional post-translational regulator responsible for the turnover of PAL and negatively controlling phenylpropanoid biosynthesis. Furthermore, we discover that exposure of Arabidopsis to UV-B radiation suppresses the expression of all four KFB genes while inducing the transcription of PAL isogenes; these data suggest that Arabidopsis consolidates both transcriptional and post-translational regulation mechanisms to maximize its responses to UV stress. Simultaneous down-regulation of all four identified KFBs significantly enhances the production of (poly)phenols and the plant’s tolerance to UV irradiation. This study offers a biotechnological approach for engineering the production of useful phenolic chemicals and for increasing a plant’s resistance to environmental stress.

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Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States)

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

Grant/Contract Number:: SC00112704

OSTI ID:: 1214534

Report Number(s):: BNL-108344-2015-JA; R&D Project: BO-169; KC0304020

Journal Information:: Plant Physiology (Bethesda), Vol. 167, Issue 2; ISSN 0032-0889

Publisher:: American Society of Plant BiologistsCopyright Statement

Country of Publication:: United States

Language:: English

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