Effect of Site-Specific Intermolecular Lysine–Tryptophan Interactions on the Aggregation of Gramicidin-Based Peptides Leading to Pore Formation in Lipid Membranes View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

2018-12

AUTHORS

Alexander M. Firsov, Irina D. Pogozheva, Sergey I. Kovalchuk, Elena A. Kotova, Yuri N. Antonenko

ABSTRACT

In contrast to the parent pentadecapeptide gramicidin A (gA), some of its cationic analogs have been shown previously to form large-diameter pores in lipid membranes. These pores are permeable to fluorescent dyes, which allows one to monitor pore formation by using the fluorescence de-quenching assay. According to the previously proposed model, the gA analog with lysine substituted for alanine at position 3, [Lys3]gA, forms pores by a homopentameric assembly of gramicidin double-stranded β-helical dimers. Here, we studied the newly synthesized analogs of [Lys3]gA with single, double and triple substitutions of isoleucines for tryptophans at positions 9, 11, 13, and 15. Replacement of any of the tryptophans of [Lys3]gA with isoleucine resulted in suppression of the pore-forming activity of the peptide, the effect being significantly dependent on the position of tryptophans. In particular, the peptide with a single substitution of tryptophan 13 showed much lower activity than the analogs with single substitutions at positions 9, 11, or 15. Of the peptides with double substitutions, the strongest suppression of the leakage was observed with tryptophans 13 and 15. In the case of triple substitutions, only the peptide retaining tryptophan 11 exhibited noticeable activity. It is concluded that tryptophans 11 and 13 contribute most to pore stabilization in the membrane, whereas tryptophan 9 is not so important for pore formation. Cation-π interactions between the lysine and tryptophan residues of the peptide are suggested to be crucial for the formation of the [Lys3]gA pore. More... »

PAGES

633-640

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/s00232-018-0040-0

DOI

http://dx.doi.org/10.1007/s00232-018-0040-0

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1105474884

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/29995247


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44 schema:description In contrast to the parent pentadecapeptide gramicidin A (gA), some of its cationic analogs have been shown previously to form large-diameter pores in lipid membranes. These pores are permeable to fluorescent dyes, which allows one to monitor pore formation by using the fluorescence de-quenching assay. According to the previously proposed model, the gA analog with lysine substituted for alanine at position 3, [Lys3]gA, forms pores by a homopentameric assembly of gramicidin double-stranded β-helical dimers. Here, we studied the newly synthesized analogs of [Lys3]gA with single, double and triple substitutions of isoleucines for tryptophans at positions 9, 11, 13, and 15. Replacement of any of the tryptophans of [Lys3]gA with isoleucine resulted in suppression of the pore-forming activity of the peptide, the effect being significantly dependent on the position of tryptophans. In particular, the peptide with a single substitution of tryptophan 13 showed much lower activity than the analogs with single substitutions at positions 9, 11, or 15. Of the peptides with double substitutions, the strongest suppression of the leakage was observed with tryptophans 13 and 15. In the case of triple substitutions, only the peptide retaining tryptophan 11 exhibited noticeable activity. It is concluded that tryptophans 11 and 13 contribute most to pore stabilization in the membrane, whereas tryptophan 9 is not so important for pore formation. Cation-π interactions between the lysine and tryptophan residues of the peptide are suggested to be crucial for the formation of the [Lys3]gA pore.
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