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Protein prenylation in spinach--tissue specificity and greening-induced changes
I Parmryd1, C A Shipton, B Andersson
1Department of Biochemistry, Arrhenius Laboratories for Natural Sciences, Stockholm University, Sweden. ingela@biokemi.su.se
Archives of Biochemistry and Biophysics
|March 1, 1997
Summary
Protein prenylation patterns in spinach change during greening, with distinct protein profiles in leaf petioles versus blades. Light conditions alter the farnesol to geranylgeraniol ratio in prenylated proteins.
Area of Science:
- Plant molecular biology
- Biochemistry
- Proteomics
Background:
- Protein prenylation is a crucial post-translational modification involved in various cellular processes.
- Understanding protein prenylation in plants is essential for deciphering developmental and environmental responses.
- Spinach (Spinacia oleracea) serves as a model system to investigate these modifications.
Purpose of the Study:
- To investigate changes in protein prenylation patterns during spinach seedling development and greening.
- To compare protein prenylation in different spinach tissues (leaf petiole vs. leaf blade).
- To analyze the impact of light conditions on the types of prenyl groups incorporated into proteins.
Main Methods:
- Spinach seedlings (etiolated and green) were labeled with [3H]mevalonate to trace protein prenylation.
- Polypeptide prenylation patterns were analyzed in leaf petioles and blades.
- Changes in prenylated protein abundance during greening were assessed using gel electrophoresis and autoradiography.
- The ratio of farnesol to geranylgeraniol in thioether-linked prenylated proteins was determined under different light conditions.
Main Results:
- Significant differences were observed in the protein prenylation patterns between leaf petioles and leaf blades.
- Greening induced changes in the abundance of several prenylated polypeptides, with some increasing and others decreasing in specific molecular mass regions.
- The relative amounts of certain prenylated proteins remained unchanged during the greening process.
- Etiolated seedlings showed a higher ratio of farnesol to geranylgeraniol compared to seedlings grown under light, where geranylgeraniol predominated.
Conclusions:
- Protein prenylation is a dynamic process in spinach that varies significantly between tissues and is modulated by light exposure and developmental stage.
- The observed shifts in prenylated protein profiles and prenyl group incorporation suggest a role for prenylation in light-mediated plant development.
- These findings contribute to a deeper understanding of post-translational modifications in plants and their physiological significance.