Bogner, Martin ; Ludewig, Uwe (2007)
Visualization of arginine influx into plant cells using a specific FRET-sensor.
In: Journal of fluorescence, 17 (4)
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
Amino acids are not only the building blocks of proteins, but are the metabolic precursors of a variety of primary and secondary metabolites. In order to detect and visualize how plants transport, sense, and store amino acids with sub-cellular specificity, chimeric fluorescent proteins that respond to changes in amino acid concentrations were constructed. The reporter element of these sensors consists of a periplasmic bacterial protein that undergoes large, non-enzymatic conformational changes upon binding of its substrate. The receptor protein was attached to ECFP and an environmentally insensitive YFP derivative at opposite ends. Fluorescence resonance energy transfer changes were specifically observed after addition of arginine and to a lesser extent ornithine. The recombinant sensor showed a concentration-dependent increase in the fluorescence ratio with an apparent in vitro affinity for arginine of approximately 2 mM. A mutation in the binding pocket lowered the affinity and decreased the specificity. When expressed in E. coli, an increase in the fluorescence ratio was specifically detected after exposure to arginine and ornithine. Transient expression of the sensor in plant cell protoplasts and stable expression in Arabidopsis roots revealed specific fluorescence changes upon addition of arginine. The analysis suggests that fluorescent amino acid sensors may be versatile tools for studying the in vivo dynamics of metabolism and compartmentalization in plants.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2007 |
| Autor(en): | Bogner, Martin ; Ludewig, Uwe |
| Art des Eintrags: | Bibliographie |
| Titel: | Visualization of arginine influx into plant cells using a specific FRET-sensor |
| Sprache: | Englisch |
| Publikationsjahr: | 2007 |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Journal of fluorescence |
| Jahrgang/Volume einer Zeitschrift: | 17 |
| (Heft-)Nummer: | 4 |
| Kurzbeschreibung (Abstract): | Amino acids are not only the building blocks of proteins, but are the metabolic precursors of a variety of primary and secondary metabolites. In order to detect and visualize how plants transport, sense, and store amino acids with sub-cellular specificity, chimeric fluorescent proteins that respond to changes in amino acid concentrations were constructed. The reporter element of these sensors consists of a periplasmic bacterial protein that undergoes large, non-enzymatic conformational changes upon binding of its substrate. The receptor protein was attached to ECFP and an environmentally insensitive YFP derivative at opposite ends. Fluorescence resonance energy transfer changes were specifically observed after addition of arginine and to a lesser extent ornithine. The recombinant sensor showed a concentration-dependent increase in the fluorescence ratio with an apparent in vitro affinity for arginine of approximately 2 mM. A mutation in the binding pocket lowered the affinity and decreased the specificity. When expressed in E. coli, an increase in the fluorescence ratio was specifically detected after exposure to arginine and ornithine. Transient expression of the sensor in plant cell protoplasts and stable expression in Arabidopsis roots revealed specific fluorescence changes upon addition of arginine. The analysis suggests that fluorescent amino acid sensors may be versatile tools for studying the in vivo dynamics of metabolism and compartmentalization in plants. |
| Fachbereich(e)/-gebiet(e): | 10 Fachbereich Biologie > Pflanzenernährung und Biomasse ?? fb10_botanik ?? 10 Fachbereich Biologie |
| Hinterlegungsdatum: | 16 Mär 2010 13:17 |
| Letzte Änderung: | 05 Mär 2013 09:32 |
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