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Discovery and characterization of tannase genes in plants: roles in hydrolysis of tannins
Author(s) -
Dai Xinlong,
Liu Yajun,
Zhuang Juhua,
Yao Shengbo,
Liu Li,
Jiang Xiaolan,
Zhou Kang,
Wang Yunsheng,
Xie Deyu,
Bennetzen Jeffrey L.,
Gao Liping,
Xia Tao
Publication year - 2020
Publication title -
new phytologist
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.742
H-Index - 244
eISSN - 1469-8137
pISSN - 0028-646X
DOI - 10.1111/nph.16425
Subject(s) - tannin , hydrolyzable tannin , tannase , camellia sinensis , proanthocyanidin , biology , phylogenetic tree , botany , gene , hydrolysis , glycoside , biochemistry , polyphenol , gallic acid , antioxidant
Summary Plant tannins, including condensed tannins (CTs) and hydrolyzable tannins (HTs), are widely distributed in the plant kingdom. To date, tannase (TA) – is a type of tannin acyl‐hydrolase hydrolyzing HTs, CT monomer gallates and depsides – has been reported in microbes only. Whether plants express TA remains unknown. Herein, we report plant TA genes. A native Camellia sinensis TA ( Cs TA) is identified from leaves. Six TAs are cloned from tea, strawberry ( Fragaria × ananassa , Fa ) and four other crops. Biochemical analysis shows that the native CsTA and six recombinant TAs hydrolyze tannin compounds, depsides and phenolic glycosides. Transcriptional and metabolic analyses reveal that the expression of CsTA is oppositely associated with the accumulation of galloylated catechins. Moreover, the transient overexpression and RNA interference of FaTA are positively associated with the accumulation of ellagitannins in strawberry fruit. Phylogenetic analysis across different kingdoms shows that 29 plant TA homologs are clustered as a plant‐specific TA clade in class I carboxylesterases. Further analysis across the angiosperms reveals that these TA genes are dispersed in tannin‐rich plants, which share a single phylogenetic origin c . 120 million yr ago. Plant TA is discovered for the first time in the plant kingdom and is shown to be valuable to improve tannin compositions in plants.