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- 10Owttrim, George W.
- 5Chamot, Danuta
- 2Coleman, John R.
- 1Alessi, Daniel S.
- 1Bishop, Brendan A.
- 1Colman, Brian.
The ability to modify RNA secondary structure is crucial for numerous cellular processes. We have characterized two RNA helicase genes, crhB and crhC, which are differentially expressed in the cyanobacterium Anabaena sp. strain PCC 7120. crhC transcription is limited specifically to cold shock...
Adsorption of Biologically Critical Transition Elements to the Marine Cyanobacterium Synechococcus SP PCC 7002Download
It has been demonstrated that microbial biomass plays an important role in marine trace element cycling. The influence of microbes may be attributed to the dominantly negative surface charge of bacteria at pH values characteristic of seawater. Recent work has begun to more fully explore how...
Autoregulation of RNA helicase expression in response to temperature stress in Synechocystis spCC 6803Download
RNA helicases are ubiquitous enzymes whose modification of RNA secondary structure is known to regulate RNA function. The pathways controlling RNA helicase expression, however, have not been well characterized. Expression of the cyanobacterial RNA helicase, crhR, is regulated in response to...
Conditional proteolysis is a crucial process regulating the abundance of key regulatory proteins associated with the cell cycle, differentiation pathways, or cellular response to abiotic stress in eukaryotic and prokaryotic organisms. We provide evidence that conditional proteolysis is involved...
A recA-like gene isolated from the cyanobacterium Anabaena variabilis was cloned and partially characterized. When introduced into Escherichia coli recA mutants, the 7.5-kilobase-pair plasmid-borne DNA insert restored resistance to methyl methanesulfonate and UV irradiation, as well as...
Expression of the stress-regulated RNA helicase of Synechocystis sp. PCC 6803, CrhR, is altered by three known stresses, temperature, light and salt concentration. Here we show that altering the source of fixed nitrogen, either urea, ammonia, nitrate or lack of fixed nitrogen, also results in...
Phosphoenolpyruvate (PEP) carboxylase (EC 126.96.36.199) was purified 100-fold from the cyanobacterium Coccochloris peniocystis with a yield of 10%. A single isozyme was found at all stages of purification, and activity of other beta-carboxylase enzymes was not detected. The apparent molecular weight...
Rearrangement of RNA secondary structure is crucial for numerous biological processes. RNA helicases participate in these rearrangements through the unwinding of duplex RNA. We report here that the redox-regulated cyanobacterial RNA helicase, CrhR, is a bona fide RNA helicase possessing both...
Regulation of cold shock-induced RNA helicase gene expression in the cyanobacterium Anabaena sptrain PCC 7120Download
Expression of the Anabaena sp. strain PCC 7120 RNA helicase gene crhC is induced by cold shock.crhC transcripts are not detectable at 30°C but accumulate at 20°C, and levels remain elevated for the duration of the cold stress. Light-derived metabolic capability, and not light per se, is required...
The expression of the cyanobacterial recA gene, isolated from Anabaena variabilis, has been examined at the levels of transcript and protein abundance. Exposure of the cyanobacterium to a variety of DNA-damaging agents, including mitomycin C, methyl methanesulfonate, and UV irradiation, results...