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. 1997 Mar;179(5):1505–1512. doi: 10.1128/jb.179.5.1505-1512.1997

Characterization of UDP amino sugars as major phosphocompounds in the hyperthermophilic archaeon Pyrococcus furiosus.

V Ramakrishnan 1, Q Teng 1, M W Adams 1
PMCID: PMC178859  PMID: 9045806

Abstract

The archaeon Pyrococcus furiosus is a strictly anaerobic heterotroph that grows optimally at 100 degrees C by the fermentation of carbohydrates. It is known to contain high concentrations of novel intracellular solutes such as beta-mannosylglycerate and di-myo-inositol 1,1'-phosphate (DIP) (L. O. Martins and H. Santos, Appl. Environ. Microbiol. 61:3299-3303, 1995). Here, 31P nuclear magnetic resonance (NMR) spectroscopy was used to show that this organism also accumulates another type of phospho compound, as revealed by a major multiplet signal in the pyrophosphate region. The compounds were purified from cell extracts of P. furiosus by anion-exchange and gel filtration chromatographic procedures and were structurally analyzed by 1H, 13C, and 31P NMR spectroscopy. They were identified as two uridylated amino sugars, UDP N-acetylglucosamine and UDP N-acetylgalactosamine. Unambiguous characterizations and complete assignments of 1H and 13C resonances from such sugars have not been previously reported. In vitro 31P NMR spectroscopic analyses showed that, in contrast to DIP, which is maintained at a constant intracellular concentration (approximately 32 mM) throughout the growth phase of P. furiosus, the UDP amino sugars accumulated (to approximately 14 mM) only during the late log phase. The possible biochemical roles of these compounds in P. furiosus are discussed.

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Selected References

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