Pseudo-prolines in cyclic peptides: Conformational stabilisation of cyclo[Pro-Thr(Psi(Me,Me)Pro)-Pro]

Linear peptide H-Pro-Thr(Psi(Me,Me)pro)-Pro-OH containing a preformed cis-Pro-Thr(Psi(Me,Me)pro) tertiary amide bond cyclises instantaneously and free of formation of oligomeric structures to the cyclic tripeptide cyclo-[Pro-Thr(Psi(Me,Me)pro)-Pro]. Even at concentrations up to 10(-1) M peptide, no oligomeric structures are detected by mass spectroscopy and HPLC. 2D H-1 NMR studies of purified cyclotripeptide reveal the compound to exist in one single conformation with all peptide bonds in the cis conformation. These results indicate enhanced cyclisation tendencies of cis-amide bond containing peptides of short chain length. (C) 1999 Elsevier Science Ltd. All rights reserved.


Published in:
Tetrahedron, 55, 37, 11281-11288
Year:
1999
ISSN:
0040-4020
Laboratories:




 Record created 2006-02-09, last modified 2018-01-27


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