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phosphofructokinase/cárie dentária
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The effect of introducing small cavities on the allosteric inhibition of phosphofructokinase from Bacillus stearothermophilus.
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The allosteric coupling free energy between ligands fructose-6-phosphate (Fru-6-P) and phospho(enol)pyruvate (PEP) for phosphofructokinase-1 (PFK) from the moderate thermophile, Bacillus stearothermophilus (BsPFK), results from compensating enthalpy and entropy components. In BsPFK the positive
Electron microscopy analysis of mammalian phosphofructokinase reveals an unusual 3-dimensional structure with significant implications for enzyme function.
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Phosphofructokinase is a sophisticated allosteric enzyme that is fundamental for the control of glycolysis. The structure of the bacterial enzyme is well characterized. However, little is known about the structural organization of the more complex enzyme from mammals. We have obtained the structure
Inactivation of the Streptococcus mutans fxpC gene confers resistance to xylitol, a caries-preventive natural carbohydrate sweetener.
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Xylitol is transported by Streptococcus mutans via a constitutive phosphoenolpyruvate:fructose phosphotransferase system (PTS) composed of a IIABC protein. Spontaneous xylitol-resistant strains are depleted in constitutive fructose-PTS activity, exhibit additional phenotypes, and are associated with
[Xylitol, mechanisms of action and uses].
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Xylitol is recommended as a sugar substitute and is claimed not only to be non-cariogenic, but also to exhibit an anti-caries effect. An interesting aspect of xylitol is that it has a certain bacteriostatic effect. Xylitol is taken up by many strains of Strep mutans and Strep sanguis even if these
Effect of follicle-stimulating hormone on metabolism and maturation in Bufo arenarum oocytes.
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In the fully grown Bufo arenarum oocyte, carbohydrate breakdown during the autumn-winter season is accomplished mainly through the glycolytic pathway followed by the Krebs cycle. During the breeding season (spring-summer), carbohydrates are used mainly through the pentose phosphate cycle and through
Coordinated Regulation of the EIIMan and fruRKI Operons of Streptococcus mutans by Global and Fructose-Specific Pathways.
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The glucose/mannose-phosphotransferase system (PTS) permease EIIMan encoded by manLMN in the dental caries pathogen Streptococcus mutans has a dominant influence on sugar-specific, CcpA-independent catabolite repression (CR). Mutations in manL affect energy metabolism and virulence-associated
Diabetes causes marked changes in function and metabolism of rat neutrophils.
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Several studies have shown impairment of neutrophil function, a disorder that contributes to the high incidence of infections in diabetes. Since glucose and glutamine play a key role in neutrophil function, we investigated their metabolism in neutrophils obtained from the peritoneal cavity of
Essential Roles of the sppRA Fructose-Phosphate Phosphohydrolase Operon in Carbohydrate Metabolism and Virulence Expression by Streptococcus mutans.
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The dental caries pathogen Streptococcus mutans can ferment a variety of sugars to produce organic acids. Exposure of S. mutans to certain non-metabolizable carbohydrates such as xylitol impairs growth and can cause cell death. Recently, the presence of a sugar-phosphate stress in S. mutans was
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