Glucosyltransferases
Mostrando 1-12 de 91 artigos, teses e dissertações.
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1. Anti-carie and antiproliferative effect of 7-epiclusianone, isolated from Rheedia genus plant / Avaliação das atividades anticarie e antiproliferativa da 7-epiclusianona isolada da planta do genero Rheedia
Considering the great use of plants as medicinal substances in the popular medicine, it is critical to investigate their biological and chemical properties in order to not only help to enhance our understanding of the therapeutic potential of these natural products, but also how to make them more effective pharmacological agents. The enormous biodiversitiy o
Publicado em: 2008
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2. Study of the in vitro of extract from leaves and oil-resin of Copaíba upon virulence factors of Streptococcus mutans, related to the dental caries / Estudo do efeito in vitrode extrato das folhas e do óleo-resina de copaíba sobre fatores de virulência de Streptococcus mutans, relacionados à cárie dental
A cárie dental, uma doença multifatorial de caracter bacteriana associada à dieta alimentar, que danifica a estrutura dos dentes, se mantém como um problema de saúde pública mundial. A produção de ácidos por bactérias acidogênicas, como o Streptococcus mutans é considerada um importante fator etiológico no desenvolvimento de cáries. Este microo
Publicado em: 2007
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3. Caracterização dos padrões de expressão de glucosiltransferases B e C, da proteina ligante de glucano B e de possiveis genes reguladores em genotipos distintos de Streptococcus mutans / Expression analysis of glucosyltransferases B and C, glucan-binding protein B and their putative regulatory genes in distinct genotypes of Streptococcus mutans
Streptococcus mutans, the main pathogen of dental caries, have the capacity to accumulate in the dental biofilm in the presence of sucrose, under highly acidic conditions that are responsible for teeth demineralization. The glucosyltransferases B (GtfB) and C (GtfC) produced by S. mutans are essential in this process, because catalyze the synthesis of water-
Publicado em: 2006
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4. Estudo in vitro do efeito da propolis da Bahia (Mata Atlantica) sobre estreptococos do grupo mutans e na atividade das glucosiltransferases
Propolis is a natural beehive product, and its main constituents are polyphenolic compounds, such as flavonoids and cinnamic acid derivatives. However, propolis type 6, from Bahia (Atlantic forest, Northeastern, Brazil) presents an unusual chemical composition containing basically non-polar compounds; flavonoids were not detected in this sample. This study e
Publicado em: 2002
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5. Role of C-terminal direct repeating units of the Streptococcus mutans glucosyltransferase-S in glucan binding.
The C-terminal glucan-binding domain of the glucosyltransferase-S of Streptococcus mutans GS-5 contains five 65-amino-acid direct repeating units. A series of deletion derivatives of both the glucosyltransferase-S and its glucan-binding domain were constructed and analyzed. The results demonstrated that the four C-terminal direct repeating units constituted
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6. Regulation of Triacylglucose Fatty Acid Composition (Uridine Diphosphate Glucose:Fatty Acid Glucosyltransferases with Overlapping Chain-Length Specificity).
UDP-glucose (UDP-Glc):fatty acid glucosyltransferases catalyze the UDP-Glc-dependent activation of fatty acids as 1-O-acyl-[beta]-glucoses. 1-O-Acyl-[beta]-glucoses act as acyl donors in the biosynthesis of 2,3,4-tri-O-acylglucoses secreted by wild tomato (Lycopersicon pennellii) glandular trichomes. The acyl composition of L. pennellii 2,3,4-tri-O-acylgluco
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7. New osmoregulated beta(1-3),beta(1-6) glucosyltransferase(s) in Azospirillum brasilense.
A linear beta(1-3),beta(1-6) glucan was detected in the periplasm of Azospirillum brasilense cells growing in a medium of low osmotic strength. This glucan was produced in vitro by purified bacterial inner membranes with UDP-glucose as the sugar donor in the presence of Mg2+. Growth in a high-osmotic-strength medium strongly reduced the amount of this glucan
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8. Evidence for a modular structure of the homologous repetitive C-terminal carbohydrate-binding sites of Clostridium difficile toxins and Streptococcus mutans glucosyltransferases.
The homologous C-terminal repeats of Clostridium difficile toxins (ToxA and ToxB) and streptococcal glucosyltransferases appear to mediate protein-carbohydrate interactions at cellular binding sites with sugar moieties as substrates. A consensus sequence of 134 repeating units from gram-positive bacteria indicates that these repeats have a modular design wit
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9. Monoclonal antibodies to the extracellular glucosyltransferases from Streptococcus sobrinus 6715.
Murine monoclonal antibodies (MAbs) were raised against the glucosyltransferases (GTFs) of Streptococcus sobrinus 6715. The antibody panels included MAbs raised against the primer-independent, soluble product enzyme (GTF-Si) which did not cross-react with other GTFs, as well as MAbs raised against the primer-dependent, soluble product enzyme (GTF-Sd) which r
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10. Adenosine Diphosphoglucose-Starch Glucosyltransferases from Developing Kernels of Waxy Maize
Two adenosine diphosphoglucose: α-1,4-glucan α-4-glucosyl-transferases were extracted from kernels of waxy maize harvested 22 days after pollination and separated by gradient elution from a diethylaminoethyl-cellulose column. Both fractions could utilize amylopectin, amylose, glycogen, maltotriose and maltose as primers. The rate of glucose transfer from a
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11. Molecular Characterization of Inulosucrase from Leuconostoc citreum: a Fructosyltransferase within a Glucosyltransferase
The gene coding for inulosucrase in Leuconostoc citreum CW28, islA, was cloned, sequenced, and expressed in Escherichia coli. The recombinant enzyme catalyzed inulin synthesis from sucrose like the wild-type enzyme. Inulosucrase presents an unusual structure: its N-terminal region is similar to the variable region of glucosyltransferases, its catalytic domai
American Society for Microbiology.
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12. Analysis of a DNA polymorphic region in the gtfB and gtfC genes of Streptococcus mutans.
We have previously demonstrated the existence of DNA polymorphisms at the 5' coding regions of the gtfB and gtfC genes specifying the streptococcal glucosyltransferases (J.S. Chia, T.Y. Hsu, L.J. Teng, J.Y. Chen, L.J. Hahn, and C.S. Yang, Infect. Immun. 59:1656-1660, 1991). DNA sequence analysis by polymerase chain reaction and direct sequencing revealed tha