[GRAPHICS]We describe the synthesis and characterization of the first generation of oligomers consisting of alternating repeats of alpha-amino acids and chiral N-alkyl-beta-alanine (beta-peptoid) residues. These chimeras are stable toward proteolysis, non-hemolytic, and possess antibacterial activity comparable to well-known antimicrobial agents. Moreover, the chimeras exhibit length-dependent, concentration-dependent, solvent-dependent, and ion-strength-dependent ellipticity, indicating the presence of a secondary structure in solution. Thus, alpha-peptide/beta-peptoid oligomers represent a promising novel peptidomimetic backbone construct for biologically active ligands.
<i>Cis</i>–<i>Trans</i> Amide Bond Rotamers in β-Peptoids and Peptoids: Evaluation of Stereoelectronic Effects in Backbone and Side Chains
作者:Jonas S. Laursen、Jens Engel-Andreasen、Peter Fristrup、Pernille Harris、Christian A. Olsen
DOI:10.1021/ja312532x
日期:2013.2.20
we here report an investigation of the effect of structural variations on the cis-trans amide bond rotamer equilibria in a selection of monomer model systems. In addition to various side chain effects, which correlated well with previous studies of α-peptoids, we present the synthesis and investigation of cis-trans isomerism in the firstexamples of peptoids and β-peptoids containing thioamide bonds
cyclization of α,β-tetrapeptoids. The ctct amide sequence revealed in the crystal structure of the 14-membered cyclotetrapeptoid 8 is also the most populated conformation in solution and is reminiscent of the predominant amide arrangement of the 12-membered cyclic tetrapeptides (CTPs).
Convenient Solution-Phase Synthesis and Conformational Studies of Novel Linear and Cyclic α,β-Alternating Peptoids
作者:Thomas Hjelmgaard、Sophie Faure、Cécile Caumes、Emiliana De Santis、Alison A. Edwards、Claude Taillefumier
DOI:10.1021/ol9015767
日期:2009.9.17
The synthesis of a novel family of peptidomimetics composed of linear and cyclic α,β-alternating peptoids is described. Oligomers consisting of up to six peptoid residues (n = 1−3) were synthesized on large scale with use of an efficient iterative solution-phase method and longer oligomers (n = 4, 5) were obtained by the coupling of appropriately protected shorter oligomers. Preliminary conformational
preparation of a wide range ofdimeric buildingblocks, displaying different types of side-chains, for use in solid-phase synthesis (SPS) of libraries of this type of oligomers. The β-peptoid monomers were obtained by microwave-assisted aza-Michael additions to acrylic esters. Subsequent solution-phase peptide coupling with suitably protected α-amino acids afforded dimeric intermediates. Even sluggish peptide
作者:Christian A. Olsen、Gitte Bonke、Line Vedel、Anne Adsersen、Matthias Witt、Henrik Franzyk、Jerzy W. Jaroszewski
DOI:10.1021/ol070316c
日期:2007.4.1
[GRAPHICS]We describe the synthesis and characterization of the first generation of oligomers consisting of alternating repeats of alpha-amino acids and chiral N-alkyl-beta-alanine (beta-peptoid) residues. These chimeras are stable toward proteolysis, non-hemolytic, and possess antibacterial activity comparable to well-known antimicrobial agents. Moreover, the chimeras exhibit length-dependent, concentration-dependent, solvent-dependent, and ion-strength-dependent ellipticity, indicating the presence of a secondary structure in solution. Thus, alpha-peptide/beta-peptoid oligomers represent a promising novel peptidomimetic backbone construct for biologically active ligands.