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. 2020 Nov 20;21(22):8776. doi: 10.3390/ijms21228776

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© 2020 by the author.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Structure of small Trp-containing peptides. (A) Helical wheel presentation of peptide WRK-12 (WRLRWKTRWRLK) and (B,C) three-dimensional structures of gramicidin A (PBD 1C4D) in PyMol ribbon presentation are shown. All Trp (W) residues are indicated in red. For gramicidin, two views of the Trp-containing portion of the peptide are presented: a side view (B) and a top view of the cylinder shape (C), showing the Trp side chains protruded around the channel. The amino- and carboxy-termini are indicated with N and C, respectively.