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Plant Tannase: Evolutionary and Functional Divergence Features.

Jie Ma1, Youshudi Xie1, Fengyun Tian1

  • 1College of Tea Science, Guizhou University, Guiyang 550025, Guizhou, China.

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|March 27, 2025
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Summary
This summary is machine-generated.

Researchers identified three genes in tea plants involved in ester hydrolysis. The newly discovered tannase (TA) enzyme shows broad catalytic functions, expanding understanding of plant metabolism and specialized metabolites.

Keywords:
enzyme activityfunctional divergencemultiomics correlation analysistea plantsα/β-hydrolase

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Area of Science:

  • Plant biochemistry
  • Molecular evolution
  • Enzymology

Background:

  • Alpha/beta-hydrolases are key enzymes in plant metabolism, regulating ester compound hydrolysis.
  • Specialized metabolites in plants are diverse and play crucial roles in plant physiology and interactions.
  • Understanding plant enzymes is vital for elucidating complex metabolic pathways.

Purpose of the Study:

  • To identify and characterize novel alpha/beta-hydrolase genes in the tea plant (Camellia sinensis).
  • To investigate the evolutionary history and substrate specificity of identified esterase enzymes.
  • To explore the potential role of these enzymes, particularly tannase, in tea plant metabolism.

Main Methods:

  • Multi-omics correlation analysis to identify candidate genes (CsCSE, CsCXE3, CsTA).
  • Phylogenetic analysis to determine evolutionary relationships.
  • Enzyme activity assays to characterize substrate specificity and catalytic functions.

Main Results:

  • Three genes encoding caffeoyl shikimate esterase (CSE), carboxylesterase (CXE), and tannase (TA) were isolated.
  • CSE and CXE are ancient enzyme families, while TA emerged in core eudicots ~120 million years ago.
  • CsTA exhibited broad substrate specificity, hydrolyzing phenolic acid esters, acetate esters, galloylated catechin, hydrolyzable tannin, and hormone esters, alongside the activities of CsCSE and CsCXE3.

Conclusions:

  • CsTA represents a newly evolved alpha/beta-hydrolase with significant functional divergence.
  • The broad catalytic activity of CsTA suggests a key role in the complex metabolic processes of tea plants.
  • This study enhances the understanding of plant tannase enzymes and their contribution to specialized metabolites.