Volume 126, Issue 36 pp. 9604-9609
Zuschrift

A Tandem In Situ Peptide Cyclization through Trifluoroacetic Acid Cleavage

Dr. Koushik Chandra

Dr. Koushik Chandra

Institute of Chemistry, Edmond J. Safra campus The Hebrew University of Jerusalem, Givat Ram, Jerusalem 91904 (Israel) http://chem.ch.huji.ac.il/∼assaf

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Dr. Tapta Kanchan Roy

Dr. Tapta Kanchan Roy

Institute of Chemistry, Edmond J. Safra campus The Hebrew University of Jerusalem, Givat Ram, Jerusalem 91904 (Israel) http://chem.ch.huji.ac.il/∼assaf

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Dr. Deborah E. Shalev

Dr. Deborah E. Shalev

The Wolfson Centre for Applied Structural Biology, The Hebrew University of Jerusalem (Israel)

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Prof. Abraham Loyter

Prof. Abraham Loyter

Department of Biological Chemistry, The Alexander Silberman Institute of Life Sciences, The Hebrew University of Jerusalem (Israel)

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Prof. Chaim Gilon

Prof. Chaim Gilon

Institute of Chemistry, Edmond J. Safra campus The Hebrew University of Jerusalem, Givat Ram, Jerusalem 91904 (Israel) http://chem.ch.huji.ac.il/∼assaf

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Prof. R. Benny Gerber

Prof. R. Benny Gerber

Institute of Chemistry, Edmond J. Safra campus The Hebrew University of Jerusalem, Givat Ram, Jerusalem 91904 (Israel) http://chem.ch.huji.ac.il/∼assaf

The Fritz Haber Centre, The Hebrew University of Jerusalem (Israel)

Department of Chemistry, University of Helsinki, P.O. Box 55, 00014 Helsinki (Finland)

University of California, Irvine, CA 92697 (USA)

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Prof. Assaf Friedler

Corresponding Author

Prof. Assaf Friedler

Institute of Chemistry, Edmond J. Safra campus The Hebrew University of Jerusalem, Givat Ram, Jerusalem 91904 (Israel) http://chem.ch.huji.ac.il/∼assaf

Institute of Chemistry, Edmond J. Safra campus The Hebrew University of Jerusalem, Givat Ram, Jerusalem 91904 (Israel) http://chem.ch.huji.ac.il/∼assafSearch for more papers by this author
First published: 14 May 2014
Citations: 2

A.F. was supported by the European Research Council (FP7/2007-2013)/ERC Grant agreement n° 203413 and the Minerva Center for Bio-Hybrid complex systems. K.C. and T.K.R. are supported by a PBC fellowship, Council of Higher Education, Israel. T.K.R. thanks the CSC-IT Center for Science, Finland, for computational resources and Dr. S. Saha for fruitful discussions. R.B.G. thanks the Academy of Finland in the framework of the FiDiPro program.

Abstract

We present a new approach for peptide cyclization during solid phase synthesis under highly acidic conditions. Our approach involves simultaneous in situ deprotection, cyclization and trifluoroacetic acid (TFA) cleavage of the peptide, which is achieved by forming an amide bond between a lysine side chain and a succinic acid linker at the peptide N-terminus. The reaction proceeds via a highly active succinimide intermediate, which was isolated and characterized. The structure of a model cyclic peptide was solved by NMR spectroscopy. Theoretical calculations support the proposed mechanism of cyclization. Our new methodology is applicable for the formation of macrocycles in solid-phase synthesis of peptides and organic molecules.

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