Glycogen Formation by the Ruminal Bacterium Prevotella ruminicola.

Applied and Environmental Microbiology
J LouH J Strobel

Abstract

Prevotella ruminicola is an important ruminal bacteria. In maltose-grown cells, nearly 60% of cell dry weight consisted of high-molecular-weight (>2 x 10(sup6)) glycogen. The ratio of glycogen to protein (grams per gram) was relatively low (1.3) during exponential growth, but when cell growth slowed during the transition to the stationary phase, the ratio increased to 1.8. As much as 40% of the maltose was converted to glycogen during cell growth. Glycogen accumulation in glucose-grown cells was threefold lower than that in maltose-grown cells. In continuous cultures provided with maltose, much less glycogen was synthesized at high (>0.2 per h) than at low dilution rates, where maltose was limiting (28 versus 60% of dry weight, respectively). These results indicated that glycogen synthesis was stimulated at low growth rates and was also influenced by the growth substrate. In permeabilized cells, glycogen was synthesized from [(sup14)C]glucose-1-phosphate but not radiolabelled glucose, indicating that glucose-1-phosphate is the initial precursor of glycogen formation. Glycogen accumulation may provide a survival mechanism for P. ruminicola during periods of carbon starvation and may have a role in controlling starch fermentation...Continue Reading

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Citations

Jun 2, 2015·Frontiers in Microbiology·Timothy J Hackmann, Jeffrey L Firkins
Aug 3, 2011·Die Naturwissenschaften·Liang Wang, Michael J Wise
Apr 16, 2013·Applied and Environmental Microbiology·Timothy J HackmannJeffrey L Firkins
Oct 10, 1998·Research in Microbiology·B Boeck, R Schinzel
Nov 15, 1997·Applied and Environmental Microbiology·J LouH J Strobel
Jun 28, 2019·Biomacromolecules·Liang WangRobert G Gilbert

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