Tunicamycin Antibiotic
Mostrando 1-12 de 38 artigos, teses e dissertações.
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1. Genetic transformation of sugarcane by biolistic and Agrobacterium tumefaciens to study the mechanism of programmed cell death / Transformação genética de cana-de-açúcar por biolística e Agrobacterium tumefaciens visando estudar o mecanismo de morte celular programada
Sugarcane is one of the main crops planted in Brazil and presents significant socioeconomic and agribusiness importance to the country. The world scene is quite favorable as regards the marketing of its two main products, sugar and alcohol, driving the development of the national sugar-alcohol sector. Therefore, the sugarcane genetic breeding appears as the
Publicado em: 2009
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2. Tunicamycin Inhibits Protein Glycosylation in Suspension Cultured Soybean Cells 1
Soybean cells in suspension culture incorporate [3H]mannose into dolichyl-phosphoryl-mannose and into lipid-linked oligosaccharides as well as into extracellular and cell wall macromolecules. Tunicamycin completely inhibited the formation of lipid-linked oligosaccharides at a concentration of 5 to 10 micrograms per milliliter, but it had no effect on the for
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3. Tunicamycin inhibits ganglioside biosynthesis in neuronal cells
The antibiotic tunicamycin blocks the transfer of GlcNAc-1-P from UDP-GlcNAc to dolichol phosphate, thereby blocking the synthesis of N-linked oligosaccharide chains on glycoproteins. Its effect on the biosynthesis of gangliosides has not been reported. We report that tunicamycin caused a 70-80% reduction in incorporation of [3H]GlcN into gangliosides and ne
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4. Inhibition of biosynthesis of Saccharomyces cerevisiae sugar transport system by tunicamycin.
Tunicamycin apparently inhibited the biosynthesis of glucose, galactose, and maltose transport systems in Saccharomyces cerevisiae. Under the conditions used, the antibiotic also blocked the biosynthesis of invertase, a well-known yeast glycoprotein, as well as the glycosylation of a marker mannoprotein of the yeast cell wall. However, the antibiotic did not
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5. Assembly of viral membranes: maturation of the vesicular stomatitis virus glycoprotein in the presence of tunicamycin.
The role of glycosylation in the maturation of the vesicular stomatitis virus (VSV) glycoprotein was studied by use of the antibiotic tunicamycin. Tunicamycin-treated VSV-infected cells synthesize an unglycosylated form of the VSV glycoprotein (R. Leavitt, S. Schlesinger, and S. Kornfeld, J. Virol. 21:375--385, 1977). We have found that tunicamycin has no ef
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6. Evidence for role of glycoprotein carbohydrates in membrane transport: specific inhibition by tunicamycin.
Using tunicamycin, we have investigated the role of glycoproteins in membrane transport. Tunicamycin is a glucosamine-containing antibiotic that specifically inhibits dolichol pyrophosphate-mediated glycosylation of asparaginyl residues of glycoproteins. Inhibition of protein glycosylation in chick embryo fibroblasts by tunicamycin or other inhibitors of gly
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7. Antiviral activity of tunicamycin on herpes simplex virus.
Tunicamycin (0.5 microgram/ml) significantly lowers (2 to 3 log10) the infectious yield of herpes simplex virus type 1 grown in chicken embryo fibroblasts and in BSC1 cells. Although virus particles are formed and the synthesis of the viral deoxyribonucleic acid is only partially affected by the antibiotic, the glycosylation of herpesvirus glycopeptides is a
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8. Effect of tunicamycin on herpes simplex virus glycoproteins and infectious virus production.
The antibiotic tunicamycin, which blocks the synthesis of glycoproteins, inhibited the production of infectious herpes simplex virus. In the presence of this drug, [14C]glucosamine and [3H]mannose incorporation was reduced in infected cells, whereas total protein synthesis was not affected. Gel electrophoresis of [2-3H]mannose-labeled polypeptides failed to
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9. Tunicamycin inhibits ganglioside biosynthesis in rat liver Golgi apparatus by blocking sugar nucleotide transport across the membrane vesicles.
The synthesis of ganglioside GM1 in intact rat liver Golgi-derived vesicles is stimulated by phosphatidylglycerol as much (about 20-fold) as by Triton X-100. The antibiotic tunicamycin inhibits strongly the synthesis, in the presence as well as in the absence of the phospholipid, but has no effect when Golgi membranes are solubilized with detergent. In Prona
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10. Asparagine-linked glycosylation in Saccharomyces cerevisiae: genetic analysis of an early step.
Asparagine-linked glycosylation is a form of covalent modification that distinguishes proteins that are either membrane bound or are in cellular compartments topologically outside of the cell from those proteins that remain soluble in the cytoplasm. This type of glycosylation occurs stepwise, with core oligosaccharide added in the endoplasmic reticulum and s
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11. Effects of Several Tunicamycin-like Antibiotics on Glycoprotein Biosynthesis in Mung Beans and Suspension-cultured Soybean Cells 1
The antibiotics Streptovirudin and 24010 were tested to determine their effects on the formation of lipid-linked saccharide intermediates associated with glycoprotein biosynthesis in mung bean (Vigna radiata) and suspension-cultured soybean cells (Glycine max cv. Mandarin). In vitro both compounds strongly inhibited the transfer of N-acetyl[3H]glucosamine fr
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12. Asparagine-linked carbohydrate does not determine the cellular location of yeast vacuolar nonspecific alkaline phosphatase.
The nonspecific alkaline phosphatase of Saccharomyces sp. strain 1710 has been shown by phosphatase cytochemistry to be exclusively located in the vacuole, para-Nitrophenyl phosphate-specific alkaline phosphatase is not detected by this procedure because the activity of this enzyme is sensitive to the fixative agent, glutaraldehyde. To determine whether the