Mammalian expression of infrared fluorescent proteins engineered from a bacterial phytochrome

Xiaokun Shu, Antoine Royant, Michael Z. Lin, Todd A. Aguilera, Varda Lev-Ram, Paul A. Steinbach, Roger Y. Tsien

Research output: Contribution to journalArticle

496 Scopus citations

Abstract

Visibly fluorescent proteins (FPs) from jellyfish and corals have revolutionized many areas of molecular and cell biology, but the use of FPs in intact animals, such as mice, has been handicapped by poor penetration of excitation light. We now show that a bacteriophytochrome from Deinococcus radiodurans, incorporating biliverdin as the chromophore, can be engineered into monomeric, infrared-fluorescent proteins (IFPs), with excitation and emission maxima of 684 and 708 nm, respectively; extinction coefficient >90,000 M -1 cm-1; and quantum yield of 0.07. IFPs express well in mammalian cells and mice and spontaneously incorporate biliverdin, which is ubiquitous as the initial intermediate in heme catabolism but has negligible fluorescence by itself. Because their wavelengths penetrate tissue well, IFPs are suitable for whole-body imaging. The IFPs developed here provide a scaffold for further engineering.

Original languageEnglish (US)
Pages (from-to)804-807
Number of pages4
JournalScience
Volume324
Issue number5928
DOIs
StatePublished - May 8 2009

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ASJC Scopus subject areas

  • Medicine(all)
  • General

Cite this

Shu, X., Royant, A., Lin, M. Z., Aguilera, T. A., Lev-Ram, V., Steinbach, P. A., & Tsien, R. Y. (2009). Mammalian expression of infrared fluorescent proteins engineered from a bacterial phytochrome. Science, 324(5928), 804-807. https://doi.org/10.1126/science.1168683