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Antimicrobial Peptides Produced by Selective Pressure Incorporation of Non-canonical Amino Acids

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Structural glance into a novel anti-staphylococcal peptide.

N B Iannucci¹, L M Curto, F Albericio

¹Department of Biological Chemistry and Institute of Biochemistry and Biophysics (IQUIFIB), School of Pharmacy and Biochemistry, University of Buenos Aires, Junín 956, C1113AAD, Buenos Aires, Argentina; Therapeutic Peptides Research and Development Laboratory, Chemo-Romikin, Carlos Villate 5148, B1605AXL, Buenos Aires, Argentina.

|August 29, 2013

Summary

Researchers developed a novel antimicrobial peptide from human lysozyme with enhanced anti-staphylococcal activity. Its structural changes improve bacterial membrane interaction, aiding in combating drug-resistant bacteria.

Keywords:

cationic antimicrobial peptides circular dichroism conformation fluorescence human lysozyme phospholipid detergent micelles

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Semi-Quantitative Analysis of Peptidoglycan by Liquid Chromatography Mass Spectrometry and Bioinformatics

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Published on: October 13, 2020

Area of Science:

Biochemistry
Microbiology
Drug Discovery

Background:

Antimicrobial peptides (AMPs) are crucial for combating rising microbial drug resistance.
Human lysozyme fragment 107-115 serves as a basis for novel antimicrobial agents.

Purpose of the Study:

To investigate a novel peptide derived from human lysozyme (RKWVWWRNR-NH2) for enhanced anti-staphylococcal activity.
To elucidate the structural and functional relationship between peptide conformation and bacterial membrane interaction.

Main Methods:

Circular dichroism and fluorescence spectroscopy were used for conformational analysis.
Interaction with model lipidic phases was studied to assess membrane binding.
Site-directed mutagenesis (Ala to Trp substitution) was employed to study structural impact.

Main Results:

The novel peptide (RKWVWWRNR-NH2) exhibited a 20-fold increase in anti-staphylococcal activity.
Conformational analysis revealed significant spectral changes upon interaction with lipidic phases.
A single amino acid substitution (Trp at position 111) dramatically altered peptide secondary structure and enhanced membrane interaction.

Conclusions:

Peptide secondary structure and residue distribution are critical for effective bacterial membrane interaction.
Enhanced interaction with the bacterial plasma membrane is linked to the peptide's lethal effect.
This study provides insights for the rational design of next-generation antimicrobial peptides from natural sources.