Die Stickstoff‐15‐Kernresonanz — Grenzen und Möglichkeiten

Breitmaier, Eberhard

doi:10.1002/pauz.19830120601

Cited by 16 publications

(2 citation statements)

References 39 publications

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“…The range of coupling constants (within 80 -100 Hz) strongly supported the view of sp2 hybridization at all four nitrogen atoms. The chemical shift of the two resonances at low magnetic field (108.2 and 104.8 ppm) conformed with that expected for glutamine side-chain amides, whereas the other two signals came very close to those expected for urea derivatives [20]. 15N-NMR spectroscopy therefore confirmed the structure proposed above (Fig.…”

Section: Resultssupporting

confidence: 84%

Isolation and structure determination of a novel compatible solute from the moderately halophilic purple sulfur bacterium Ectothiorhodospira marismortui

Galinski

Oren

1991

European Journal of Biochemistry

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The halophilic phototrophic bacterium Ectothiorhodospira marismortui produces three organic osmolytes to counterbalance the osmotic pressure of the surrounding medium: glycine betaine, sucrose, and a novel compound. This new compound, which accounts for approximately 30% of the cells' compatible solutes, was isolated and identified by mass spectrometry and nuclear magnetic resonance. It was characterized as Nα‐carbamoyl‐l‐glutamine 1‐amide, an unusual amino acid derivative with no previous reference in the chemical literature. The relatively high cytoplasmic concentration of this compound (∼ 0.5 M) observed at all growth conditions suggests that it may serve a vital function as an osmoticum and/or protectant for Ectothiorhodospira marismortui in a saline environment.

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