Polyprenol
Mostrando 1-12 de 15 artigos, teses e dissertações.
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1. Estudo fitoquÃmico de plantas ativas contra o bicho mineiro do cafeeiro. / Phytochemical studies of plants active against the coffee leaf miner.
O bicho mineiro do cafeeiro causa grande prejuÃzo aos cafeicultores brasileiros pois ataca suas folhas diminuindo a sua produtividade. Em decorrÃncia, buscou-se contribuir para o desenvolvimento de mÃtodos de controle do referido inseto pelo estudo fitoquÃmico das folhas de duas plantas encontradas no estado de Minas Gerais, Geonoma schottiana Mart. e Ac
Publicado em: 2008
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2. Investigação das atividades mutagênica, antimutagênica e antioxidante de extratos etanólicos de Aiouea trinervis, Nectandra cissiflora, Ocotea minarum (Lauraceae) e dos alcalóides triptofol, ocoteína e dicentrina
The Brazilian cerrado (tropical American savanna) is a semi-arid region in which plants are submitted to metabolic stress that triggers defense mechanisms when confronted with unfavorable environmental conditions. The Lauraceae is an economically important family with 52 genera and approximately 2500-2750 species consisting mostly of trees or tree-like shrub
Publicado em: 2008
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3. Sequential assembly and polymerization of the polyprenol-linked pentasaccharide repeating unit of the xanthan polysaccharide in Xanthomonas campestris.
Lipid-linked intermediates are involved in the synthesis of the exopolysaccharide xanthan produced by the bacterium Xanthomonas campestris (L. Ielpi, R. O. Couso, and M. A. Dankert, FEBS Lett. 130:253-256, 1981). In this study, the stepwise assembly of the repeating pentasaccharide unit of xanthan is described. EDTA-treated X. campestris cells were used as b
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4. The Role of Polyprenol-Bound Saccharides as Intermediates in Glycoprotein Synthesis in Liver
It has been reported that liver microsomes catalyze the transfer of glucose from uridine diphosphate glucose to dolichol monophosphate so as to produce dolichol monophosphate glucose. Dolichol is a polyprenol containing about 20 isoprene units. The glucosyl residue of dolichol monophosphate glucose is transferred to an endogenous acceptor on further incubati
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5. Changes in the 14C-Labeled Cell Wall Components with Chase Time after Incorporation of UDP[14C]Glucose by Intact Cotton Fibers 1
Intact, in vitro-grown cotton fibers will incorporate [14C]glucose from externally supplied UDP[14C]glucose into a variety of cell wall components including cellulose; this labeled fraction will continue to increase up to 4 hours chase time. In the fraction soluble in hot water there was no significant change in total label; however, the largest fraction aft
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6. Structure and glycosylation of lipoteichoic acids in Bacillus strains.
The occurrence, structure, and glycosylation of lipoteichoic acids were studied in 15 Bacillus strains, including Bacillus cereus (4 strains), Bacillus subtilis (5 strains), Bacillus licheniformis (1 strain), Bacillus polymyxa (2 strains), and Bacillus circulans (3 strains). Whereas in the cells of B. polymyxa and B. circulans neither lipoteichoic acid nor r
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7. Defects in the N-Linked Oligosaccharide Biosynthetic Pathway in a Trypanosoma brucei Glycosylation Mutant†
Concanavalin A (ConA) kills the procyclic (insect) form of Trypanosoma brucei by binding to its major surface glycoprotein, procyclin. We previously isolated a mutant cell line, ConA 1-1, that is less agglutinated and more resistant to ConA killing than are wild-type (WT) cells. Subsequently we found that the ConA resistance phenotype in this mutant is due t
American Society for Microbiology.
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8. Biosynthesis of lipid-linked oligosaccharides and glycoprotein in aorta: stimulation by acceptor lipids isolated from liver.
An acidic glycolipid fraction was isolated from porcine liver and partially purified on DEAE-cellulose. This material markedly stimulated the incorporation of mannose from GDP-[14C]mannose into lipid-linked oligosaccharides and into glycoprotein, but did not stimulate incorporation into the mannosyl-phosphoryl-polyprenol. The products formed from GDP-[14C]ma
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9. Enhancement of resistance to Escherichia coli infection in mice by dihydroheptaprenol, a synthetic polyprenol derivative.
The effect of a chemically synthesized polyprenol derivative, dihydroheptaprenol (DHP), on the nonspecific resistance of mice to infection with Escherichia coli was investigated. Mice that had been injected intramuscularly with 100 mg of DHP per kg of body weight, prepared as a microemulsion with lecithin, 1 to 4 days before infection showed enhanced resista
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10. Biosynthesis of linkage units for teichoic acids in gram-positive bacteria: distribution of related enzymes and their specificities for UDP-sugars and lipid-linked intermediates.
The distribution and substrate specificities of enzymes involved in the formation of linkage units which contain N-acetylglucosamine (GlcNAc) and N-acetylmannosamine (ManNAc) or glucose and join teichoic acid chains to peptidoglycan were studied among membrane systems obtained from the following two groups of gram-positive bacteria: group A, including Bacill
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11. Expression and Study of Recombinant ExoM, a β1-4 Glucosyltransferase Involved in Succinoglycan Biosynthesis in Sinorhizobium meliloti
Here we report on the overexpression and in vitro characterization of a recombinant form of ExoM, a putative β1-4 glucosyltransferase involved in the assembly of the octasaccharide repeating subunit of succinoglycan from Sinorhizobium meliloti. The open reading frame exoM was isolated by PCR and subcloned into the expression vector pET29b, allowing inducibl
American Society for Microbiology.
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12. Identification of the apparent carrier in mycolic acid synthesis.
The mycolic acids are large (C70-90) alpha-alkyl, beta-hydroxy fatty acids and are the major determinants of the mycobacterial cell wall's impermeable barrier. The biosynthesis of mycolic acids is barely understood (they are probably the products of specialized elongation and Claisen-type condensation), and yet their synthesis is the site of action of severa