Two independent routes of post-translational chemistry in fluorescent protein FusionRed

Liya Muslinkina, Vladimir Z. Pletnev, Nadya V. Pletneva, Dmitry A. Ruchkin, Danila V. Kolesov, Alexey M. Bogdanov, Lubov A. Kost, Tatiana V. Rakitina, Yulia K. Agapova, Irina I. Shemyakina, Dmitry M. Chudakov, Sergei Pletnev

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

The crystal structure of monomeric red fluorescent protein FusionRed (λexem 580/608 mn) has been determined at 1.09 Å resolution and revealed two alternative routes of post-translational chemistry, resulting in distinctly different products. The refinement occupancies suggest the 60:40 ratio of the mature Met63-Tyr64-Gly65 chromophore and uncyclized chromophore-forming tripeptide with the protein backbone cleaved between Met63 and the preceding Phe62 and oxidized Cα-Cβ bond of Tyr64. We analyzed the structures of FusionRed and several related red fluorescent proteins, identified structural elements causing hydrolysis of the peptide bond, and verified their impact by single point mutagenesis. These findings advance the understanding of the post-translational chemistry of GFP-like fluorescent proteins beyond the canonical cyclization-dehydration-oxidation mechanism. They also show that impaired cyclization does not prevent chromophore-forming tripeptide from further transformations enabled by the same set of catalytic residues. Our mutagenesis efforts resulted in inhibition of the peptide backbone cleavage, and a FusionRed variant with ~30% improved effective brightness.

Original languageEnglish
Pages (from-to)551-559
Number of pages9
JournalInternational Journal of Biological Macromolecules
Volume155
DOIs
Publication statusPublished - 15 Jul 2020
Externally publishedYes

Keywords

  • and Polypeptide backbone cleavage
  • Crystal structure
  • FusionRed
  • Red fluorescent proteins

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