Synthesis of fluorescent dipeptidomimetics and their ribosomal incorporation into green fluorescent protein

Sandipan Roy Chowdhury, Rumit Maini, Larisa Dedkova, Sidney Hecht

Research output: Contribution to journalArticlepeer-review

14 Scopus citations


The synthesis and incorporation into position 66 of green fluorescent protein (GFP) by in vitro protein translation of novel oxazole and thiazole based dipeptidomimetics are described. The compounds may be regarded as GFP chromophore analogues, and are strongly fluorescent. An α-amido-β-ketoester intermediate was obtained via bisacylation of a protected glycine. The intermediate underwent dehydrative cyclization to afford the 1,3-oxazole and was treated with Lawesson's reagent to furnish the 1,3-thiazole. When these fluorophores were introduced into position 66 of GFP in place of Tyr66, the resulting GFP analogues exhibited fluorescence emission several-fold greater than wild-type GFP; the emission was also shifted to shorter wavelength. It may be noted that compared to the typical fluorophores formed in the natural and modified fluorescent proteins, the oxazole and thiazole fluorophores are completely stable and do not require activation by posttranslational modification to exhibit fluorescence.

Original languageEnglish (US)
Pages (from-to)4715-4718
Number of pages4
JournalBioorganic and Medicinal Chemistry Letters
Issue number21
StatePublished - Nov 1 2015


  • Dipeptidomimetics
  • Green fluorescent protein
  • Modified ribosome
  • Oxazole
  • Thiazole

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Medicine
  • Molecular Biology
  • Pharmaceutical Science
  • Drug Discovery
  • Clinical Biochemistry
  • Organic Chemistry


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