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Nucleotide sequence and characterization of a gene encoding the phytochrome polypeptide from Avena
H P Hershey1, R F Barker, K B Idler
1Department of Botany, University of Wisconsin, Madison 53706.
Gene
|January 1, 1987
Summary
Researchers identified and characterized the Avena phytochrome 3 (phy3) gene. This gene encodes a key light-sensing protein, with regulatory elements potentially involved in light responses.
Area of Science:
- Plant molecular biology
- Photoreceptor genetics
Background:
- Phytochromes are crucial plant photoreceptors regulating light responses.
- Understanding phytochrome gene structure and regulation is essential for plant science.
Purpose of the Study:
- To isolate and characterize the gene encoding the phytochrome polypeptide in Avena, designated as phytochrome 3 (phy3).
- To elucidate the structural features and potential regulatory mechanisms of the phy3 gene.
Main Methods:
- Gene isolation and characterization.
- Nucleotide sequencing and comparison with cDNA clones.
- Mung-bean nuclease digestion to identify the transcription start point.
- Analysis of 5'-flanking DNA for regulatory sequence elements.
Main Results:
- Isolated and characterized the Avena phytochrome 3 (phy3) gene, approximately 5.9 kb long with six exons and five introns.
- Identified the largest exon encodes the 74-kDa N-terminal chromophore-bearing domain of the phytochrome.
- Determined the transcription start point and identified potential light-regulatory elements in the 5'-flanking region, including homology to the 'GT' motif.
Conclusions:
- The phy3 gene structure and its regulatory elements provide insights into phytochrome-mediated light responses in Avena.
- The identified sequence elements suggest a role in light-regulated gene expression, similar to other light-responsive genes.