Synthesis and Cellular Labeling of Multifunctional Phosphatidylinositol Bis- and Trisphosphate Derivatives

Rainer Müller, Ana Kojic, Mevlut Citir, Carsten Schultz

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

We synthesized the first multifunctionalized phosphoinositide polyphosphate derivatives featuring a photo-removable protecting group (“cage”), a photo-crosslinkable diazirine group, and a terminal alkyne group useful for click chemistry. We demonstrate that the lipid derivatives readily enter cells. After photo-crosslinking, cell fixation and fluorescent tagging via click chemistry, we determined the intracellular location of the lipid derivatives before and after uncaging of the lipids. We find that there is rapid trafficking of PI(3,4)P2 and PI(3,4,5)P3 derivatives to the plasma membrane, opening the intriguing possibility that there is active transport of these lipids involved. We employed the photo-crosslinking and click chemistry functions to analyze the proteome of PI(3,4,5)P3-binding proteins. From the latter, we validated by RNAi that the putative lipid binding proteins ATP11A and MPP6 are involved in the transport of PI(3,4,5)P3 to the plasma membrane.

Original languageEnglish (US)
Pages (from-to)19759-19765
Number of pages7
JournalAngewandte Chemie - International Edition
Volume60
Issue number36
DOIs
StatePublished - Sep 1 2021
Externally publishedYes

Keywords

  • caged compounds
  • cell imaging
  • lipid transport
  • phosphoinositides
  • photo-crosslinking

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)

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