Glyphosate does not substitute for glycine in proteins of actively dividing mammalian cells

Michael N Antoniou (Lead / Corresponding author), Armel Nicolas, Robin Mesnage, Martina Biserni, Francesco V Rao, Cristina Vazquez Martin

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Abstract

Objectives: Glyphosate (N-phosphonomethyl glycine) and its commercial herbicide formulations have been shown to exert toxicity via various mechanisms. It has been asserted that glyphosate substitutes for glycine in polypeptide chains leading to protein misfolding and toxicity. However, as no direct evidence exists for glycine to glyphosate substitution in proteins, including in mammalian organisms, we tested this claim by conducting a proteomics analysis of MDA-MB-231 human breast cancer cells grown in the presence of 100 mg/L glyphosate for 6 days. Protein extracts from three treated and three untreated cell cultures were analysed as one TMT-6plex labelled sample, to highlight a specific pattern (+/+/+/-/-/-) of reporter intensities for peptides bearing true glyphosate treatment induced-post translational modifications as well as allowing an investigation of the total proteome.

Results: Comparative statistical analysis of global proteome changes between glyphosate treated and non-treated samples did not show significant differences. Crucially, filtering of data to focus analysis on peptides potentially bearing glycine for glyphosate replacement revealed that the TMT reporter intensity pattern of all candidates showed conclusively that they are all false discoveries, with none displaying the expected TMT pattern for such a substitution. Thus, the assertion that glyphosate substitutes for glycine in protein polypeptide chains is incorrect.

Original languageEnglish
Article number494
Pages (from-to)1-7
Number of pages7
JournalBMC Research Notes
Volume12
DOIs
Publication statusPublished - 8 Aug 2019

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Keywords

  • Glyphosate
  • Glycine
  • Proteome

Cite this

Antoniou, M. N., Nicolas, A., Mesnage, R., Biserni, M., Rao, F. V., & Martin, C. V. (2019). Glyphosate does not substitute for glycine in proteins of actively dividing mammalian cells. BMC Research Notes, 12, 1-7. [494]. https://doi.org/10.1186/s13104-019-4534-3