Solution phase synthesis and purification of the minigramicidin ion channels and a succinyl-linked gramicidin
摘要:
Peptides with alternating D- and L-configured residues as found in the natural ion channel active peptide gramicidin A (gA) are important building blocks for artificially engineered ion channels. We detail an optimised solution phase synthesis employing a convergent assembly of peptide building blocks, giving access to the minigramicidines and a succinyl linked gA derivative on preparative scale. Moreover, the minigramicidines were investigated for secondary structure formation by CD-spectroscopy. which was discovered to be medium and capping-group dependent. A parallel, left-handed double-beta-helix seems to be generally favoured in organic solvents for the minigramicidines. (C) 2002 Elsevier Science Ltd. All rights reserved.
Solution phase synthesis and purification of the minigramicidin ion channels and a succinyl-linked gramicidin
摘要:
Peptides with alternating D- and L-configured residues as found in the natural ion channel active peptide gramicidin A (gA) are important building blocks for artificially engineered ion channels. We detail an optimised solution phase synthesis employing a convergent assembly of peptide building blocks, giving access to the minigramicidines and a succinyl linked gA derivative on preparative scale. Moreover, the minigramicidines were investigated for secondary structure formation by CD-spectroscopy. which was discovered to be medium and capping-group dependent. A parallel, left-handed double-beta-helix seems to be generally favoured in organic solvents for the minigramicidines. (C) 2002 Elsevier Science Ltd. All rights reserved.
Tetrahydropyran-Amino Acids: Novel Building Blocks for Gramicidin-Hybrid Ion Channels
作者:Sabine Schröder、Anna K. Schrey、Andrea Knoll、Philipp Reiß、Burkhard Ziemer、Ulrich Koert
DOI:10.1002/ejoc.200600068
日期:2006.6
a δ-amino acid has been achieved starting from N-Boc-leucinal. The THP amino acid was incorporated into peptide sequences and the structural consequences were studied by X-ray crystallography and NMR analysis. Single-channel current measurements showed that the THP amino acid is a suitable substitute for positions 11 and 12 of the gramicidin ionchannel. The resulting hybrid ionchannel revealed Eisenman