Genome-Wide Analysis of Serine Carboxypeptidase-Like Acyltransferase Gene Family for Evolution and Characterization of Enzymes Involved in the Biosynthesis of Galloylated Catechins in the Tea Plant (Camellia sinensis )

Frontiers in Plant Science
Muhammad Zulfiqar AhmadJian Zhao

Abstract

Tea (Camellia sinensis L.) leaves synthesize and concentrate a vast array of galloylated catechins (e.g., EGCG and ECG) and non-galloylated catechins (e.g., EGC, catechin, and epicatechin), together constituting 8%-24% of the dry leaf mass. Galloylated catechins account for a major portion of soluble catechins in tea leaves (up to 75%) and make a major contribution to the astringency and bitter taste of the green tea, and their pharmacological activity for human health. However, the catechin galloylation mechanism in tea plants is largely unknown at molecular levels. Previous studies indicated that glucosyltransferases and serine carboxypeptidase-like acyltransferases (SCPL) might be involved in the process. However, details about the roles of SCPLs in the biosynthesis of galloylated catechins remain to be elucidated. Here, we performed the genome-wide identification of SCPL genes in the tea plant genome. Several SCPLs were grouped into clade IA, which encompasses previously characterized SCPL-IA enzymes with an acylation function. Twenty-eight tea genes in this clade were differentially expressed in young leaves and vegetative buds. We characterized three SCPL-IA enzymes (CsSCPL11-IA, CsSCPL13-IA, CsSCPL14-IA) with galloylatio...Continue Reading

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Datasets Mentioned

BETA
MK843824
MK843825
MK843826
MK843827
MK843828

Methods Mentioned

BETA
acylation
transacylation
PCR
Assay
electrophoresis
environmental stresses
environmental stress
RNA-Seq
transacylations

Software Mentioned

ExPASy
MEME
HyPhy
Gene Structure Display Server
BEB
Plant cis - acting Regulatory DNA Elements ( PlantCARE )
Mev4
PlantCARE
R package
TBTools

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