4.8 Article

Stable Isotope Phosphate Labelling of Diverse Metabolites is Enabled by a Family of 18O-Phosphoramidites**

期刊

出版社

WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202112457

关键词

capillary electrophoresis; mass spectrometry; nucleotides; phosphorylation; stable isotope labelling

资金

  1. Deutsche Forschungsgemeinschaft (DFG) [EXC-2189, 390939984]
  2. European Research Council (ERC) under the European Union [864246]
  3. Studienstiftung des Deutschen Volkes
  4. Medical Research Council [MR/T028904/1]
  5. Brigitte Schlieben-Lange Programm
  6. Cusanus-Werk
  7. Projekt DEAL
  8. MRC [MR/T028904/1] Funding Source: UKRI
  9. European Research Council (ERC) [864246] Funding Source: European Research Council (ERC)

向作者/读者索取更多资源

A novel synthetic method for O-18-labelled phosphates is introduced to facilitate access to required standards for stable isotope labelling in quantitative mass spectrometry. The study demonstrates consistent >95% O-18 enrichment ratios and good yields in gram-scale reactions, enabling late-stage labelling and analysis of metabolites in biological samples. The utility of O-18-labelled inositol phosphates and pyrophosphates is shown through assignment of these metabolites from different biological matrices.
Stable isotope labelling is state-of-the-art in quantitative mass spectrometry, yet often accessing the required standards is cumbersome and very expensive. Here, a unifying synthetic concept for O-18-labelled phosphates is presented, based on a family of modified O-18(2)-phosphoramidite reagents. This toolbox offers access to major classes of biologically highly relevant phosphorylated metabolites as their isotopologues including nucleotides, inositol phosphates, -pyrophosphates, and inorganic polyphosphates. O-18-enrichment ratios >95 % and good yields are obtained consistently in gram-scale reactions, while enabling late-stage labelling. We demonstrate the utility of the O-18-labelled inositol phosphates and pyrophosphates by assignment of these metabolites from different biological matrices. We demonstrate that phosphate neutral loss is negligible in an analytical setup employing capillary electrophoresis electrospray ionisation triple quadrupole mass spectrometry.

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