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6 resultats
Fluoroorotic acid-selected Nicotiana plumbaginifolia cell lines with a stable thymine starvation phenotype have lost the thymine-regulated transcriptional program.
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We have selected 143 independent Nicotiana plumbaginifolia cell lines that survive in the presence of 5-fluoroorotic acid. These lines show several diverse phenotypes. The majority of these cell lines showed reduced levels of UMP synthase. However, one particular phenotype, which represents 14% of
Effect of base, pentose, and phosphodiester backbone structures on binding and repair of pyrimidine dimers by Escherichia coli DNA photolyase.
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Photolyases reverse the effects of UV light on cells by converting cyclobutane dipyrimidine photoproducts (pyrimidine dimers, Pyr mean value of Pyr) into pyrimidine monomers in a light-dependent reaction. Previous work has suggested that, based on substrate preference, there are two classes of
Response of tobacco and Haplopappus cells to ultraviolet irradiation after posttreatment with photoreactivating light.
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Experiments were performed to test whether significant amounts of pyrimidine dimers are produced in cultured cells of tobacco (Nicotiana tabacum L. var. Xanthi) and of Haplopappus gracilis by ultraviolet light in the biological dose range and whether either or both dark and light repair systems
Uridine 5'-Monophosphate Synthase Is Transcriptionally Regulated by Pyrimidine Levels in Nicotiana plumbaginifolia
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To understand the regulation and expression of pyrimidine biosynthesis in plants, we have examined the effect of the metabolic inhibitor 5-fluoroorotic acid (FOA) on uridine-5'-monophosphate synthase (UMPSase) expression in cell cultures of Nicotiana plumbaginifolia. UMPSase is the rate-limiting
DNA synthesis in cytokinin-autotrophic tobacco cells : Effect of bromodeoxyuridine, fluorodeoxyuridine, and kinetin.
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DNA isolated from various Nicotiana tabacum cell types, differing in their degree of hormone autotrophy and incubated in the presence of bromodeoxyuridine (BrdUrd), was analyzed by isopycnic CsCl gradient centrifugation. All cell types incorporate BrdUrd into DNA in such a way that hybrid DNA is
The role of UV-B radiation in aquatic and terrestrial ecosystems--an experimental and functional analysis of the evolution of UV-absorbing compounds.
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We analysed and compared the functioning of UV-B screening pigments in plants from marine, fresh water and terrestrial ecosystems, along the evolutionary line of cyanobacteria, unicellular algae, primitive multicellular algae, charophycean algae, lichens, mosses and higher plants, including
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