Solid-Phase Synthesis of DOTA-Peptides

Luis M. De León-Rodriguez, Zoltan Kovacs, Gregg R. Dieckmann, A. Dean Sherry

Research output: Contribution to journalArticle

45 Scopus citations

Abstract

A general synthetic route to two DOTA-linked N-Fmoc amino acids (DOTA-F and DOTA-K) is described that allows insertion of DOTA at any endo-position within a peptide sequence. Three model pentapeptides were prepared to test the general utility of these derivatives in solid-phase peptide synthesis. Both DOTA derivatives reacted smoothly by means of standard HBTU activation chemistry to the point of insertion of the DOTA amino acid, but extension of the peptide chain beyond the DOTA-amino acid insertion required the use of pre-activated C-pentafluorophenyl ester N-α-Fmoc amino acids. Three Gal-80 binding peptides (12-mers) were then prepared by using this methodology with DOTA positioned either at the N terminus or at one of two different internal positions;the binding of the resulting GdDOTA-12-mers to Gal-80 were compared. The methodology described here allows versatile, controlled introduction of DOTA into any location within a peptide sequence. This provides a potential method for the screening of libraries of DOTA-linked peptides for optimal targeting properties.

Original languageEnglish (US)
Pages (from-to)1149-1155
Number of pages7
JournalChemistry - A European Journal
Volume10
Issue number5
DOIs
StatePublished - Mar 5 2004

Keywords

  • Gadolinium complexes
  • Macrocylic ligands
  • Peptides
  • Solid-phase synthesis

ASJC Scopus subject areas

  • Catalysis
  • Organic Chemistry

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