Related Experiment Video
Updated: Jun 26, 2026
08:59
Defining Substrate Specificities for Lipase and Phospholipase Candidates
Published on: November 23, 2016
Two poplar methyl salicylate esterases display comparable biochemical properties but divergent expression patterns
Nan Zhao1, Ju Guan, Farhad Forouhar
1Department of Plant Sciences, University of Tennessee, 252 Ellington Plant Science Bldg., 2431 Joe Johnson Drive, Knoxville, TN 37996, USA.
Phytochemistry
|January 13, 2009
Summary
Poplar plants possess two highly similar methyl salicylate (MeSA) esterase genes, PtSABP2-1 and PtSABP2-2. These genes show distinct expression patterns and responses to stress, suggesting involvement in different biological processes.
Area of Science:
- Plant molecular biology
- Biochemistry
- Genetics
Background:
- Methyl salicylate (MeSA) esterase (SABP2) plays a role in plant defense and signaling.
- Understanding MeSA esterases in poplar (Populus) is crucial for elucidating plant stress responses.
Purpose of the Study:
- To identify and characterize MeSA esterase genes in poplar.
- To investigate the expression patterns and stress responses of these genes.
Main Methods:
- Gene cloning and sequencing
- Enzyme activity assays (Km values)
- Structural modeling
- Gene expression analysis (quantitative PCR) under normal and stress conditions
Main Results:
- Two homologous poplar genes, PtSABP2-1 and PtSABP2-2, encoding MeSA esterases were identified.
- Both recombinant proteins showed specific activity towards MeSA, with distinct kinetic parameters.
- PtSABP2-1 was primarily expressed in leaves, while PtSABP2-2 was highly expressed in roots.
- PtSABP2-1 expression decreased under stress, whereas PtSABP2-2 expression increased under specific stress factors.
Conclusions:
- Poplar possesses at least two MeSA esterase genes with divergent roles in normal growth and stress adaptation.
- The differential expression and regulation of PtSABP2-1 and PtSABP2-2 suggest distinct functional pathways in poplar physiology.
