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Antifungal Activity against Filamentous Fungi of Ts1, a Multifunctional Toxin from Tityus serrulatus Scorpion Venom

Texto completo
Autor(es):
Santussi, Welligton M. ; Bordon, Karla C. F. ; Rodrigues Alves, Ana P. N. ; Cologna, Camila T. ; Said, Suraia ; Arantes, Eliane C.
Número total de Autores: 6
Tipo de documento: Artigo Científico
Fonte: FRONTIERS IN MICROBIOLOGY; v. 8, JUN 6 2017.
Citações Web of Science: 2
Resumo

Antimicrobial peptides (AMPs) are ubiquitous and multipotent components of the innate immune defense arsenal used by both prokaryotic and eukaryotic organisms. The search for new AMPs has increased in recent years, due to the growing development of microbial resistance to therapeutical drugs. In this work, we evaluate the effects of Tityus serrulatus venom (Tsv), its fractions and its major toxin Ts1, a beta-neurotoxin, on fungi growth. The fractions were obtained by ion-exchange chromatography of Tsv. The growth inhibition of 11 pathogenic and non-pathogenic filamentous fungi (Aspergillus fumigatus, A. nidulans, A. niger, A. terreus, Neurospora crassa, Penicillium corylophilum, P. ochrochloron, P. verrucosum, P. viridicatum, P. waksmanii, and Talaromyces flavus) was evaluated by quantitative microplate reader assay. Tsv (100 and 500 mu g/well, which correspond to 1 and 5 mu g/mL, respectively, of total soluble protein) was active in inhibiting growth of A. nidulans, A. terreus, P. corylophilum, and P. verrucosum, especially in the higher concentration used and at the first 30 h. After this period, fungi might have used Tsv components as alternative sources of nutrients, and therefore, increased their growth tax. Only fractions IX, X, XI, XIIA, XIIB (3 and 7.5 mu g/well, which correspond to 30 and 75 mg/mL, respectively, of total soluble protein) and Ts1 (1.5, 3, and 6 mu g/well, which correspond to 2.18, 4.36, and 8.72 mu M, respectively) showed antifungal activity. Ts1 showed to be a non-morphogenic toxin with dose-dependent activity against A. nidulans, inhibiting 100% of fungal growth from 3 mu g/well (4.36 mu M). The inhibitory effect of Ts1 against A. nidulans growth was accompanied by fungistatic effects and was not amended by 1 mM CaCl2 or tetrodotoxin (46.98 and 93.96 mu M). The structural differences between Ts1 and drosomycin, a potent cysteine-rich antifungal peptide, are discussed here. Our results highlight the antifungal potential of the first cysteine-containing scorpion toxin. Since Ts1 is a multifunctional toxin, we suggest that it could be used as a template in the design of engineered scorpion AMPs and in the search for new mechanisms of action of antifungal drugs. (AU)

Processo FAPESP: 05/56592-7 - Estudo da ação do veneno do escropiao brasileiro (Tityus serrulatus e de suas frações na inibição do crescimento de fungos
Beneficiário:Welligton de Mattos Santussi
Linha de fomento: Bolsas no Brasil - Mestrado
Processo FAPESP: 05/54855-0 - Toxinas animais: estrutura, função e aplicações biotecnológicas
Beneficiário:Suely Vilela
Linha de fomento: Auxílio à Pesquisa - Temático
Processo FAPESP: 15/18432-0 - Bioprospecção de toxinas animais com interesse biotecnológico a partir de ferramentas ômicas
Beneficiário:Eliane Candiani Arantes Braga
Linha de fomento: Auxílio à Pesquisa - Regular