Secondary metabolites in ramalina terebrata detected by UHPLC/ESI/MS/MS and identification of parietin as tau protein inhibitor

Alberto Cornejo, Francisco Salgado, Julio Caballero, Reinaldo Vargas, Mario Simirgiotis, Carlos Areche

Research output: Contribution to journalArticlepeer-review

51 Citations (Scopus)


Liquid chromatography coupled with mass spectrometry is an outstanding methodology for fast analysis of phenolic compounds in biological samples. Twenty two compounds were quickly and accurately identified in the methanolic extract of the Antarctic lichen Ramalina terebrata for the first time using ultra high pressure liquid chromatography coupled with photodiode array detector and high resolution mass spectrometry (UHPLC-PDA-Q/Orbitrap/MS/MS). In addition, the extract and the four compounds isolated from this species were tested for the inhibitory activity of tau protein aggregation, which is a protein involved in Alzheimer’s disease (AD). All compounds showed null activity with the exception of parietin, which it was able to inhibit aggregation process of tau in a concentration range between 3 μg/mL (10 μM) to 28 μg/mL (100 μM). In addition, we show how parietin interact with tau306VQIVYK311 hexapeptide inside of the microtubule binding domain (4R) with the help of molecular docking experiments. Finally, the constituents present in the methanolic extract could possibly contribute to the established anti-aggregation activity for this extract and this in-depth analysis of the chemical composition of R. terebrata could guide further research into its medicinal properties and potential uses.

Original languageEnglish
Article number1303
JournalInternational Journal of Molecular Sciences
Issue number8
Publication statusPublished - 18 Aug 2016


  • Alzheimer’s disease
  • Docking
  • Lichens
  • Parietin
  • Ramalina
  • Tau protein

ASJC Scopus subject areas

  • Catalysis
  • Molecular Biology
  • Spectroscopy
  • Computer Science Applications
  • Physical and Theoretical Chemistry
  • Organic Chemistry
  • Inorganic Chemistry


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