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Open AccessArticle

Sarconesin II, a New Antimicrobial Peptide Isolated from Sarconesiopsis magellanica Excretions and Secretions

Special Laboratory for Applied Toxinology (LETA), Butantan Institute, São Paulo CEP 05503-900, SP, Brazil
Institute of Biomedical Sciences, University of São Paulo, São Paulo CEP 05508-900, SP, Brazil
PhD Program in Biomedical and Biological Sciences, Universidad del Rosario, Bogotá 111221, Colombia
Bacteriology Laboratory, Butantan Institute, São Paulo CEP 05503-900, SP, Brazil
Medicine Faculty, Universidad Antonio Nariño, Bogotá 110231, Colombia
Special Laboratory of Cell Cycle (LECC), Butantan Institute, São Paulo CEP 05503-900, SP, Brazil
Biophysics Department, UNIFESP, São Paulo CEP 04023-062, Brazil
Molecular Biology and Immunology Department, Fundación Instituto de Inmunología de Colombia (FIDIC), Bogotá 111321, Colombia
Basic Sciences Department, School of Medicine and Health Sciences, Universidad del Rosario, Bogotá 112111, Colombia
Faculty of Agricultural and Livestock Sciences, Veterinary Medicine Programme, Universidad de La Salle, Bogotá 110141, Colombia
Authors to whom correspondence should be addressed.
Molecules 2019, 24(11), 2077;
Received: 9 March 2019 / Revised: 11 April 2019 / Accepted: 20 April 2019 / Published: 31 May 2019
(This article belongs to the Special Issue Antimicrobial Properties of Natural Products)
Antibiotic resistance is at dangerous levels and increasing worldwide. The search for new antimicrobial drugs to counteract this problem is a priority for health institutions and organizations, both globally and in individual countries. Sarconesiopsis magellanica blowfly larval excretions and secretions (ES) are an important source for isolating antimicrobial peptides (AMPs). This study aims to identify and characterize a new S. magellanica AMP. RP-HPLC was used to fractionate ES, using C18 columns, and their antimicrobial activity was evaluated. The peptide sequence of the fraction collected at 43.7 min was determined by mass spectrometry (MS). Fluorescence and electronic microscopy were used to evaluate the mechanism of action. Toxicity was tested on HeLa cells and human erythrocytes; physicochemical properties were evaluated. The molecule in the ES was characterized as sarconesin II and it showed activity against Gram-negative (Escherichia coli MG1655, Pseudomonas aeruginosa ATCC 27853, P. aeruginosa PA14) and Gram-positive (Staphylococcus aureus ATCC 29213, Micrococcus luteus A270) bacteria. The lowest minimum inhibitory concentration obtained was 1.9 μM for M. luteus A270; the AMP had no toxicity in any cells tested here and its action in bacterial membrane and DNA was confirmed. Sarconesin II was documented as a conserved domain of the ATP synthase protein belonging to the Fli-1 superfamily. The data reported here indicated that peptides could be alternative therapeutic candidates for use in infections against Gram-negative and Gram-positive bacteria and eventually as a new resource of compounds for combating multidrug-resistant bacteria. View Full-Text
Keywords: antimicrobial peptide; Sarconesiopsis magellanica; Calliphoridae; drug; alpha-helix antimicrobial peptide; Sarconesiopsis magellanica; Calliphoridae; drug; alpha-helix
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Díaz-Roa, A.; Espinoza-Culupú, A.; Torres-García, O.; Borges, M.M.; Avino, I.N.; Alves, F.L.; Miranda, A.; Patarroyo, M.A.; da Silva, P.I., Jr.; Bello, F.J. Sarconesin II, a New Antimicrobial Peptide Isolated from Sarconesiopsis magellanica Excretions and Secretions. Molecules 2019, 24, 2077.

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