Theoretical Computer-Aided Mutagenic Study on the Triple Green Fluorescent Protein Mutant S65T/H148D/Y145F

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Abstract

© 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. Green fluorescent protein (GFP) mutant S65T/H148D has been proposed to host a photocycle that involves an excited-state proton transfer between the chromophore (Cro) and the Asp148 residue and takes place in less than 50 fs without a measurable kinetic isotope effect. It has been suggested that the interaction between the unsuspected Tyr145 residue and the chromophore is needed for the ultrafast sub-50 fs rise in fluorescence. To verify this, we have performed a computer-aided mutagenic study to introduce the additional mutation Y145F, which eliminates this interaction. By means of QM/MM molecular dynamics simulations and time-dependent density functional theory studies, we have assessed the importance of the Cro-Tyr145 interaction and the solvation of Asp148 and shown that in the triple mutant S65T/H148D/Y145F a significant loss in the ultrafast rise of the Stokes-shifted fluorescence should be expected.
Original languageEnglish
Pages (from-to)2134-2139
JournalChemPhysChem
Volume16
Issue number10
DOIs
Publication statusPublished - 20 Jul 2015

Keywords

  • density functional calculations
  • molecular mechanics
  • protein structures
  • quantum mechanics
  • time-resolved fluorescence spectrum

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