Regulation of Glucosyl- and Fructosyltransferase Synthesis by Continuous Cultures of Streptococcus mutans
نویسندگان
چکیده
منابع مشابه
Genetic regulation of fructosyltransferase in Streptococcus mutans.
Streptococcus mutans possesses several extracellular sucrose-metabolizing enzymes which have been implicated as important virulence factors in dental caries. This study was initiated to investigate the genetic regulation of one of these enzymes, the extracellular fructosyltransferase (Ftf). Fusions were constructed with the region upstream of the S. mutans GS5 Ftf gene (ftf) and a promoterless ...
متن کاملpH regulation by Streptococcus mutans.
The intracellular pH (pHi) optimum for glycolysis in Streptococcus mutans Ingbritt was determined to be 7.0 by use of the ionophore gramicidin for manipulation of pHi. Glycolytic activity decreased to zero as the pHi was lowered from 7.0 to 5.0. In contrast, glycolysis had an extracellular pH (pHo) optimum of 6.0 with a much broader profile. The relative insensitivity of glycolysis to the lower...
متن کاملStreptococcus mutans fructosyltransferase (ftf) and glucosyltransferase (gtfBC) operon fusion strains in continuous culture.
Three glucosyltransferases (GTFs), which catalyze the formation of water-insoluble adherent glucans, and fructosyltransferase (FTF), which synthesizes fructans, are believed to contribute to the pathogenic potential of Streptococcus mutans. Study of the regulation of expression of GTF and FTF has been difficult because of the complexity and number of exoenzymes produced by this bacterium. By us...
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کاتالیست یک سنتز جدید برای تیواترها توصیف شده است. واکنش الکل ها با آریل، هتروآریل و آلکیل تیو ل ها درحضور 1،3،5- تری آزو- 2،4،6- تری فسفرین-2،2،4،4،6،6 هگزاکلراید ((tapc به عنوان یک کاتالیست موُثر، بازده های خوب تا عالی از تیواترها را حاصل می کند. علاوه براین، واکنش تحت شرایط بدون فلز و بدون حلال پیش می رود، بنابراین یک مکمل جالب برای روش های شناخته شده سنتز تیواترها ارائه می دهد. یک مکانیسم ا...
15 صفحه اولPreferential utilization of the glucosyl moiety of sucrose by a cariogenic strain of Streptococcus mutans.
The utilization of sucrose by a cariogenic strain of Streptococcus mutans was studied. The soluble and cell-bound sucrose-dependent, polymer-forming sucrase activities constitutively produced by the bacteria during growth on glucose were measured. About eight times more dextransucrase activity was present than levan-sucrase activity. During various states of growth on sucrose, S. mutans accumul...
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ژورنال
عنوان ژورنال: Journal of General Microbiology
سال: 1979
ISSN: 0022-1287
DOI: 10.1099/00221287-114-1-117