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Jasmonic AcidAmino Acid Conjugation Enzyme Assays

 Last Update: 2020-11-10
 Source: Internet
 Author: User

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thin layer chromotography

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Jasmonic acid (JA) is activated for signaling by its conjugation to isoleucine (Ile) through an amide linkage. The
Arabidopsis thaliana
JASMONIC ACID RESISTANT1 (JAR1) enzyme carries out this Mg-ATP-dependent reaction in two steps, adenylation of the free carboxyl of JA, followed by condensation of the activated group to Ile. This chapter details the protocols used to detect and quantify the enzymatic activity obtained from a glutathione-
S
-transferase:JAR1 fusion protein produced in
Escherichia coli
, including an isotope exchange assay for the adenylation step and assays for the complete reaction that involve the high-performance liquid chromatography quantitation of adenosine monophosphate, a stoichiometric by-product of the reaction, and detection of the conjugation product by thin-layer chromatography or gas �chromatography/mass spectrometry.

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