A novel analytical method for in vivo phosphate tracking. Academic Article uri icon


  • Genetically-encoded fluorescence resonance energy transfer (FRET) sensors for phosphate (P(i)) (FLIPPi) were engineered by fusing a predicted Synechococcus phosphate-binding protein (PiBP) to eCFP and Venus. Purified fluorescent indicator protein for inorganic phosphate (FLIPPi), in which the fluorophores are attached to the same PiBP lobe, shows P(i)-dependent increases in FRET efficiency. FLIPPi affinity mutants cover P(i) changes over eight orders of magnitude. COS-7 cells co-expressing a low-affinity FLIPPi and a Na(+)/P(i) co-transporter exhibited FRET changes when perfused with 100 microM P(i), demonstrating concentrative P(i) uptake by PiT2. FLIPPi sensors are suitable for real-time monitoring of P(i) metabolism in living cells, providing a new tool for fluxomics, analysis of pathophysiology or changes of P(i) during cell migration.

published proceedings

  • FEBS Lett

altmetric score

  • 7.25

author list (cited authors)

  • Gu, H., Lalonde, S., Okumoto, S., Looger, L. L., Scharff-Poulsen, A. M., Grossman, A. R., ... Frommer, W. B.

citation count

  • 81

complete list of authors

  • Gu, Hong||Lalonde, Sylvie||Okumoto, Sakiko||Looger, Loren L||Scharff-Poulsen, Anne Marie||Grossman, Arthur R||Kossmann, Jens||Jakobsen, Iver||Frommer, Wolf B

publication date

  • October 2006