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Translating Ribosome Affinity Purification (TRAP) to Investigate Arabidopsis thaliana Root Development at a Cell Type-Specific Scale
Published on: May 14, 2020
Thioredoxin targets in Arabidopsis roots
Christophe H Marchand1, Hélène Vanacker, Valérie Collin
1IBBMC, CNRS UMR 8619, Univ Paris-Sud, Orsay, France.
Proteomics
|April 21, 2010
Summary
Thioredoxin (TRX) regulation in Arabidopsis roots was studied using proteomics. Researchers identified 72 interacting proteins, revealing new redox-mediated pathways like isoprenoid biosynthesis and TRX
Area of Science:
- Plant molecular biology
- Proteomics
- Redox biology
Background:
- Thioredoxins (TRX) are crucial thiol-disulfide reductases involved in redox regulation across organisms.
- Understanding TRX interactions in plant roots is vital for elucidating cellular processes.
- Arabidopsis thaliana is a model organism for plant research.
Purpose of the Study:
- To identify proteins interacting with plastidial gamma-type thioredoxin (TRXy) in Arabidopsis thaliana roots.
- To uncover novel redox-regulated pathways in plant root systems.
- To investigate the role of TRXy1 in regulating specific enzyme activities.
Main Methods:
- Proteomic analysis using affinity chromatography with a monocysteinic mutant of TRXy as bait.
- Isolation and identification of TRX-interacting proteins from crude root extracts.
- In vitro enzymatic assays to confirm TRX-mediated regulation of specific enzymes.
Main Results:
- Seventy-two interacting proteins were identified, primarily involved in metabolism, detoxification, stress response, protein processing, and signal transduction.
- 24 putative new TRX targets were identified, suggesting redox control over isoprenoid biosynthesis.
- Evidence was provided for TRX-mediated regulation of phenylpropanoid biosynthesis and enhanced activity of monodehydroascorbate reductase by TRXy1.
Conclusions:
- Proteomic identification of TRX interactors reveals extensive redox regulation in Arabidopsis roots.
- Mevalonate-dependent isoprenoid biosynthesis and phenylpropanoid biosynthesis are proposed as new redox-mediated processes.
- TRXy1 is suggested to be the physiological regulator of monodehydroascorbate reductase in root plastids.
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