Identification of an Arabidopsis thaliana ribulose-1,5-bisphosphate carboxylase/oxygenase activase (RCA) minimal promoter regulated by light and the circadian clock.
AUTOR(ES)
Liu, Z
RESUMO
Transcription of the Arabidopsis thaliana gene encoding ribulose-1,5-bisphosphate carboxylase/oxygenase (Rubisco) activase (RCA) is organ-specific, light-responsive, and regulated by the circadian clock. RCA is transcribed throughout the green parts of the plant, but not in roots and petals. Responses elicited by short pulses of light indicate that the light response is mediated, at least in part, by phytochrome. Analysis of transgenic tobacco and Arabidopsis carrying RCA 5' untranscribed regions fused to reporter genes (uidA, encoding beta-glucuronidase, or cat, encoding chloramphenicol acetyltransferase) indicate that elements sufficient to confer organ-specific, light-responsive, and clock-regulated transcription are localized within 317 base pairs upstream of the site of transcription initiation. A clock-responsive element sufficient to confer a low-amplitude (approximately 2-fold) circadian oscillation lies within 317 base pairs of the trascription start, but other elements necessary for high-amplitude (approximately 10-fold) circadian oscillation lie upstream of -317 and are removed by deletion from -970 to -317.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=157921Documentos Relacionados
- Ribulose-1,5-bisphosphate carboxylase/oxygenase activase deficiency delays senescence of ribulose-1,5-bisphosphate carboxylase/oxygenase but progressively impairs its catalysis during tobacco leaf development.
- Ribulose-1,5-bisphosphate carboxylase/oxygenase activase cDNAs from Nicotiana tabacum.
- Moderately High Temperatures Inhibit Ribulose-1,5-Bisphosphate Carboxylase/Oxygenase (Rubisco) Activase-Mediated Activation of Rubisco1
- Growth and photosynthesis under high and low irradiance of Arabidopsis thaliana antisense mutants with reduced ribulose-1,5-bisphosphate carboxylase/oxygenase activase content.
- Differential Involvement of the Circadian Clock in the Expression of Genes Required for Ribulose-1,5-Bisphosphate Carboxylase/Oxygenase Synthesis, Assembly, and Activation in Arabidopsis thaliana.
