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Sequence-specific interaction between S1F, a spinach nuclear factor, and a negative cis-element conserved in
1Laboratoire de Biologie Moléculaire Végétale, Centre National de la Recherche Scientifique, Unité de Recherche Associée 1178, Université J. Fourier, Grenoble, France.
The Journal of Biological Chemistry
|November 25, 1992
Summary
Researchers identified a spinach nuclear factor (S1F) that binds to the rps1 promoter. This binding site acts as a negative regulator, down-regulating gene expression crucial for plastid development.
Area of Science:
- Plant Molecular Biology
- Gene Regulation
- Chloroplast Development
Background:
- The nuclear gene rps1, encoding spinach plastid ribosomal protein CS1, shows constitutive and leaf-specific expression.
- Unlike other chloroplast genes (rbcS, cab), rps1 induction is light-independent, making it a model for plastid differentiation studies.
Purpose of the Study:
- To identify regulatory factors involved in the unique expression pattern of the rps1 gene.
- To investigate the role of a specific nuclear factor (S1F) and its binding site in rps1 promoter regulation.
Main Methods:
- Identification of a spinach leaf nuclear factor (S1F) interacting with the rps1 promoter.
- Analysis of S1F binding site conservation across various plastid-related genes.
- Site-specific mutagenesis and transient expression assays in soybean protoplasts.
- Assessment of S1F binding site's effect on cauliflower mosaic virus 35S promoter activity.
Main Results:
- A spinach leaf nuclear factor, S1F, was identified, binding to the rps1 promoter.
- The S1F binding site is conserved in promoters of other plastid-related genes (rbcS, cab, rpl21).
- The S1F binding site functions as a negative regulatory element, down-regulating rps1 promoter activity.
- A tetramer of the S1F site repressed cauliflower mosaic virus 35S promoter activity, confirming its negative regulatory role.
Conclusions:
- The S1F binding site is a critical negative regulatory element controlling rps1 gene expression.
- This finding provides insights into the light-independent regulation of plastid-related genes.
- S1F and its binding site are important for understanding plastid development and differentiation mechanisms.
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