1. Photosynthetic electron transport controls expression of the high light inducible gene in the cyanobacterium Synechococcus elongatus strain PCC 7942.
- Author
-
Salem K and van Waasbergen LG
- Subjects
- Bacterial Proteins metabolism, Cell Respiration genetics, Cyanobacteria metabolism, Cytochrome b6f Complex metabolism, Dibromothymoquinone pharmacology, Diuron pharmacology, Electron Transport genetics, Gene Expression Regulation, Bacterial genetics, Gene Expression Regulation, Bacterial radiation effects, Light, Light-Harvesting Protein Complexes metabolism, Photic Stimulation, Photosynthesis genetics, Potassium Cyanide pharmacology, RNA Stability drug effects, RNA Stability genetics, RNA, Messenger drug effects, RNA, Messenger metabolism, Species Specificity, Up-Regulation genetics, Up-Regulation radiation effects, Bacterial Proteins genetics, Bacterial Proteins radiation effects, Cell Respiration radiation effects, Cyanobacteria genetics, Cyanobacteria radiation effects, Electron Transport radiation effects, Light-Harvesting Protein Complexes genetics, Light-Harvesting Protein Complexes radiation effects, Photosynthesis radiation effects
- Abstract
The hliA gene of Synechococcus, encoding a photoprotective high light inducible polypeptide, is up-regulated by high light (HL) or low intensity blue/UV-A light (BL). hliA expression was found to be up-regulated by KCN in low light (LL) (but not in the dark), and up-regulation in HL, BL, and LL (with KCN) was inhibited by 2,5-dibromo-3-methyl-6-isopropyl-benzoquinone. A working hypothesis is proposed whereby up-regulation is in response to the reduced state of cytochrome b(6)f or a carrier beyond in photosynthesis. Modest up-regulation occurs in LL by treatment with 3-(3,4-dichlorophenyl)-1,1-dimethylurea, but this is related to effects on hliA mRNA stability rather than on transcription.
- Published
- 2004
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