EPR investigation of the influence of side chain protecting groups on peptide-resin solvation of the Asx and Glx model containing peptides

EPR investigation of the influence of side chain protecting groups on peptide-resin solvation of the Asx and Glx model containing peptides

Author Cilli, Eduardo M. Google Scholar
Vicente, Eduardo F. Google Scholar
Crusca, Edson Google Scholar
Nakaie, Clovis R. Google Scholar
Institution UNESP
Universidade Federal de São Paulo (UNIFESP)
Abstract In spite of all progressive efforts aiming to optimize SPPS, serious problems mainly affecting the assembly of aggregating sequences have persisted. Following the study intended to unravel the complex solvation phenomenon of peptide-resin beads, the XING and XAAAA model aggregating segments were labeled with a paramagnetic probe and studied via EPR spectroscopy. Low and high substituted resins were also comparatively used, with the X residue being Asx or Glx containing the main protecting groups used in the SPPS. Notably, the cyclo-hexyl group used for Asp and Glu residues in Boc-chemistry induced greater chain immobilization than its tert-butyl partner-protecting group of the Fmoc strategy. Otherwise, the most impressive peptide chain immobilization occurred when the large trytil group was used for Asn and Gln protection in Fmoc-chemistry. These surprising results thus seem to stress the possibility of the relevant influence of the amino-acid side chain protecting groups in the overall peptide synthesis yield. (C) 2007 Elsevier B.V. All rights reserved.
Keywords solid-phase peptide synthesis
difficult sequences
aggregation
EPR
swelling
Language English
Date 2007-07-30
Published in Tetrahedron Letters. Oxford: Pergamon-Elsevier B.V., v. 48, n. 31, p. 5521-5524, 2007.
ISSN 0040-4039 (Sherpa/Romeo, impact factor)
Publisher Elsevier B.V.
Extent 5521-5524
Origin http://dx.doi.org/10.1016/j.tetlet.2007.05.164
Access rights Closed access
Type Article
Web of Science ID WOS:000248527400036
URI http://repositorio.unifesp.br/handle/11600/29878

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