Abstract
Both the circadian clock and phytochrome regulate expression of the Arabidopsis genes encoding the light-harvesting chlorophyll a/b-binding proteins (CAB genes). Phytochrome activates CAB transcription, and it has been proposed that the circadian clock negatively regulates CAB transcription. The tobacco nuclear proteins CUF-1 (CAB upstream factor 1) and CGF-1 (CAB GATA factor 1) bind the Arabidopsis CAB2 promoter, and the CGF-1 binding site is contained within a minimal clock- and phytochrome-regulated region of the promoter. We have used in vivo cab2::luciferase gene bioluminescence markers containing site-directed mutations in the CUF-1 and CGF-1 binding sites to define the role of these proteins in CAB2 regulation and to further delineate the terminal genomic targets of the phytochrome and circadian clock signal transduction pathways. Results from these studies confirm that CUF-1 is not required to generate the circadian clock- or phytochrome-responsive CAB2 expression pattern but rather functions as a positive factor to increase CAB2 expression levels. CGF-1 interaction with the CAB2 promoter mediates the acute increase in CAB2 expression in response to phytochrome activation and contributes to the light-induced high-amplitude circadian oscillation in CAB2 expression.
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Claims 4
Claim · model-written summary
Mutating the CUF-1 and CGF-1 binding sites did not prevent generation of the circadian clock- or phytochrome-responsive CAB2 expression pattern in Arabidopsis; CUF-1 is not required for that pattern.
- Taxon
- Arabidopsis
Arabidopsise0 - Treatment
- site-directed mutations in the CUF-1 and CGF-1 binding sitese2
- Gene
- CUF-1e3
- Outcome
- circadian clock- or phytochrome-responsive CAB2 expression patterne3
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Both the circadian clock and phytochrome regulate expression of the Arabidopsis genes encoding the light-harvesting chlorophyll a/b-binding proteins (CAB genes)”
e2“We have used in vivo cab2::luciferase gene bioluminescence markers containing site-directed mutations in the CUF-1 and CGF-1 binding sites”
e3“Results from these studies confirm that CUF-1 is not required to generate the circadian clock- or phytochrome-responsive CAB2 expression pattern but rather functions as a positive factor to increase CAB2 expression levels”
Claim · model-written summary
CUF-1 acts as a positive factor that increases CAB2 expression levels in Arabidopsis.
- Taxon
- ArabidopsisArabidopsise0
- Gene
- CUF-1e3
- Outcome
- CAB2 expression levelse3
- Direction
- increasee3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Both the circadian clock and phytochrome regulate expression of the Arabidopsis genes encoding the light-harvesting chlorophyll a/b-binding proteins (CAB genes)”
e3“Results from these studies confirm that CUF-1 is not required to generate the circadian clock- or phytochrome-responsive CAB2 expression pattern but rather functions as a positive factor to increase CAB2 expression levels”
Claim · model-written summary
CGF-1 interaction with the CAB2 promoter mediates the acute increase in CAB2 expression in response to phytochrome activation in Arabidopsis.
- Taxon
- ArabidopsisArabidopsise0
- Gene
- CGF-1e4
- Outcome
- acute increase in CAB2 expressione4
- Qualifier
- in response to phytochrome activatione4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Both the circadian clock and phytochrome regulate expression of the Arabidopsis genes encoding the light-harvesting chlorophyll a/b-binding proteins (CAB genes)”
e4“CGF-1 interaction with the CAB2 promoter mediates the acute increase in CAB2 expression in response to phytochrome activation and contributes to the light-induced high-amplitude circadian oscillation in CAB2 expression”
Claim · model-written summary
CGF-1 contributes to the light-induced high-amplitude circadian oscillation in CAB2 expression in Arabidopsis.
- Taxon
- ArabidopsisArabidopsise0
- Gene
- CGF-1e4
- Outcome
- light-induced high-amplitude circadian oscillation in CAB2 expressione4
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Both the circadian clock and phytochrome regulate expression of the Arabidopsis genes encoding the light-harvesting chlorophyll a/b-binding proteins (CAB genes)”
e4“CGF-1 interaction with the CAB2 promoter mediates the acute increase in CAB2 expression in response to phytochrome activation and contributes to the light-induced high-amplitude circadian oscillation in CAB2 expression”
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