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J Biomol Tech. 2007 February; 18(1): 47.
PMCID: PMC2291814

P134-M Solid Phase Synthesis of C-Terminus Fluorescent Peptide: Comparison of Fmoc-Lys(5-FAM)-Resin and Fmoc-Lys[5-FAM(Trt)]-Resin


Many FRET (Fluorescent Resonance Energy Transfer) peptides require a C-terminus fluorescent label. In order to facilitate the synthesis of C-terminus fluorescent peptides, we prepared and compared two kinds of resins, Fmoc-Lys(5-FAM)-resin (I) and Fmoc-Lys[5-FAM(trt)]-resin (II).1 Resin (II) has a phenolic hydroxyl group protected with trityl group. The reason for introducing the protecting group was supposedly to prevent the phenolic hydroxyl groups from reacting with the activated amino acids during peptide synthesis.

In this report, a fluorescent peptide [EREQTVDLS-VKRPRTGRKKRRQ-RRRK(5-FAM)-NH2] was synthesized using each of these resins. Syntheses were carried out under similar standard conditions. The peptides obtained showed no significant difference in purity. These results showed that resin (I) is also suitable for synthesis of C-terminus fluorescent peptide.


Key to Abstract Numbering
Prefixes: P, Poster; RG, Research Group; SP, Scientific Session Presenter; EP, Educational Session Presenter.
Following the hyphen is the designated presentation day: S, Sunday; M, Monday; T, Tuesday.


1. Fischer R, Mader O, Jung G, Brock R. Extending the applicability of carboxyfluorescein in solid-phase synthesis. Bioconjugate Chem 2003;14:653–660.

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