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Open AccessFeature PaperArticle

Identification of Antimicrobial Peptides from the Microalgae Tetraselmis suecica (Kylin) Butcher and Bactericidal Activity Improvement

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Nucleo Biotecnología Curauma, Pontificia Universidad Católica de Valparaíso, Valparaíso 2373223, Chile
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Instituto de Biología, Pontificia Universidad Católica de Valparaíso, Valparaíso 2373223, Chile
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Laboratorio de Fisiología y Genética Marina (FIGEMA), Centro de Estudios Avanzados en Zonas Áridas (CEAZA), Coquimbo 1781421, Chile
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Facultad de Ciencias del Mar, Universidad Católica del Norte, Coquimbo 1781421, Chile
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Department of Organic Chemistry and CIBER-BBN, Networking Centre on Bioengineering, Biomaterials and Nanomedicine, University of Barcelona, 08028 Barcelona, Spain
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School of Chemistry, University of KwaZulu-Natal, Durban 4001, South Africa
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Authors to whom correspondence should be addressed.
Mar. Drugs 2019, 17(8), 453; https://doi.org/10.3390/md17080453
Received: 8 July 2019 / Revised: 24 July 2019 / Accepted: 29 July 2019 / Published: 1 August 2019
The outburst of microbial resistance to antibiotics creates the need for new sources of active compounds for the treatment of pathogenic microorganisms. Marine microalgae are of particular interest in this context because they have developed tolerance and defense strategies to resist the exposure to pathogenic bacteria, viruses, and fungi in the aquatic environment. Although antimicrobial activities have been reported for some microalgae, natural algal bioactive peptides have not been described yet. In this work, acid extracts from the microalga Tetraselmis suecica with antibacterial activity were analyzed, and de novo sequences of peptides were determined. Synthetic peptides and their alanine and lysine analogs allowed identifying key residues and increasing their antibacterial activity. Additionally, it was determined that the localization of positive charges within the peptide sequence influences the secondary structure with tendency to form an alpha helical structure. View Full-Text
Keywords: antimicrobial peptides; microalga; Tetraselmis suecica; alanine scan; lysine analogs; alpha helical secondary structure antimicrobial peptides; microalga; Tetraselmis suecica; alanine scan; lysine analogs; alpha helical secondary structure
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MDPI and ACS Style

Guzmán, F.; Wong, G.; Román, T.; Cárdenas, C.; Alvárez, C.; Schmitt, P.; Albericio, F.; Rojas, V. Identification of Antimicrobial Peptides from the Microalgae Tetraselmis suecica (Kylin) Butcher and Bactericidal Activity Improvement. Mar. Drugs 2019, 17, 453.

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