Journal
BIOORGANIC & MEDICINAL CHEMISTRY
Volume 25, Issue 1, Pages 261-268Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.bmc.2016.10.033
Keywords
Gramicidin A; D-/L-Peptides; Disulfide; beta helix; Antibiotics
Funding
- DAAD
- Thuringer Ministerium fur Bildung, Wissenschaft und Kultur (TMBWK) [43-5572-321-12040-12]
Ask authors/readers for more resources
The D-/L-peptide gramicidin A (gA) is well known as a pivotal ion channel model and shows a broad spectrum of bioactivities such as antibiosis, antimalarial activity, as well as hemolysis. We applied inter-chain disulfide bonds to constrain the conformational freedom of gA into parallel and antiparallel dimeric topologies. Albeit the constructs were not found to be monoconformational, CD-and IR-spectroscopic studies suggested that this strategy indeed restricted the conformational space of the D-/L-peptide construct, and that beta-helical secondary structures prevail. Correlative testing of gA dimers in antimicrobial, antimalarial, and ion conduction assays suggested that the tail-to-tail antiparallel single stranded beta(6.3) helix dominantly mediates the bioactivity of gA. Other conformers are unlikely to contribute to these activities. From these investigations, only weakly ion conducting gA dimers were identified that retained nM antimalarial activity. (C) 2016 Elsevier Ltd. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available