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Detection of Ligand-activated G Protein-coupled Receptor Internalization by Confocal Microscopy
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Fusicoccin receptors. Evidence for endogenous ligand
P Aducci1, G Crosetti, R Federico
1Istituto di Chimica Biologica dell'Università, Città Universitaria, I-00185, Rome, Italy.
Planta
|December 7, 2013
Summary
Washing maize roots releases compounds that inhibit fusicoccin binding. These water-soluble substances may regulate plant ion transport systems by competing with fusicoccin at the receptor level.
Area of Science:
- Plant Physiology
- Molecular Biology
- Biochemistry
Background:
- Fusicoccin is a phytotoxin that promotes H+ extrusion in plants.
- Fusicoccin binding to plant membranes is crucial for its biological activity.
- The precise mechanisms regulating fusicoccin receptor interaction are not fully understood.
Purpose of the Study:
- To investigate the effect of root washing on fusicoccin binding to plant membranes.
- To identify potential endogenous ligands that modulate fusicoccin receptor activity.
Main Methods:
- In vitro binding assays using microsomal preparations from maize roots and spinach leaves.
- Tissue homogenization and washing procedures.
- Measurement of fusicoccin-promoted H+ extrusion.
Main Results:
- Washing maize root segments significantly increased fusicoccin binding to microsomal preparations.
- Freeze-dried wash solution inhibited fusicoccin binding to particulate fractions from various plant tissues.
- The wash solution also blocked fusicoccin-induced H+ extrusion from maize root segments.
Conclusions:
- Maize roots contain water-soluble compounds that compete with fusicoccin for receptor binding.
- These endogenous ligands may act as physiological modulators of the H+/K+ exchange system in plants.
- Further research is needed to elucidate the exact nature and function of these competing ligands.
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