Deciphering the role of positions 145 and 165 in fluorescence lifetime shortening in the EGFP variants

Anastasia V. Mamontova, Aleksander M. Shakhov, Konstantin A. Lukyanov, Alexey M. Bogdanov

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

The bright ultimately short lifetime enhanced emitter (BrUSLEE) green fluorescent protein, which differs from the enhanced green fluorescent protein (EGFP) in three mutations, exhibits an extremely short fluorescence lifetime at a relatively high brightness. An important contribution to shortening the BrUSLEE fluorescence lifetime compared to EGFP is provided by the T65G substitution of chromophore-forming residue and the Y145M mutation touching the chromophore environment. Although the influence of the T65G mutation was studied previously, the role of the 145th position in determining the GFPs physicochemical characteristics remains unclear. In this work, we show that the Y145M substitution, both alone and in combination with the F165Y mutation, does not shorten the fluorescence lifetime of EGFP-derived mutants. Thus, the unlocking of Y145M as an important determinant of lifetime tuning is possible only cooperatively with mutations at position 65. We also show here that the introduction of a T65G substitution into EGFP causes complex photobehavior of the respective mutants in the lifetime domain, namely, the appearance of two fluorescent states with different lifetimes, preserved in any combination with the Y145M and F165Y substitutions.

Original languageEnglish
Article number1547
Pages (from-to)1-10
Number of pages10
JournalBiomolecules
Volume10
Issue number11
DOIs
Publication statusPublished - Nov 2020

Keywords

  • Chromophore
  • Fluorescence lifetime
  • Fluorescence spectroscopy
  • Fluorescent proteins
  • GFP
  • Oscillator strength
  • Photostability
  • Quantum efficiency

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