A synthetic peptide derived of the β2-β3 loop of the plant defensin from Vigna unguiculata seeds induces Leishmania amazonensis apoptosis-like cell death.

Abstract:

:For medical use of proteins and peptide-based drugs, it is desirable to have small biologically active sequences because they improve stability, reduce side effects, and production costs. Several plant defensins have their biological activities imparted by a sequence named γ-core. Vu-Def, a Vigna unguiculata defensin, has activity against Leishmania amazonensis, which is one etiological agent of leishmaniasis and for which new drugs are needed. Our intention was to understand if the region comprising the Vu-Def γ-core is responsible for the biological activity against L. amazonensis and to unveil its mechanism of action. Different microbiological assays with L. amazonensis in the presence of the synthetic peptide A36,42,44γ32-46Vu-Def were done, as well as ultrastructural and fluorescent analyses. A36,42,44γ32-46Vu-Def showed biological activity similar to Vu-Def. A36,42,44γ32-46Vu-Def (74 µM) caused 97% inhibition of L. amazonensis culture and parasites were unable to regrow in fresh medium. The cells of the treated parasites showed morphological alterations by ultrastructural analysis and fluorescent labelings that corroborate with the data of the organelles alterations. The general significance of our work is based on the description of a small synthetic peptide, A36,42,44γ32-46Vu-Def, which has activity on L. amazonensis and that the interaction between A36,42,44γ32-46Vu-Def-L. amazonensis results in parasite inhibition by the activation of an apoptotic-like cell death pathway.

journal_name

Amino Acids

journal_title

Amino acids

authors

Souza GS,de Carvalho LP,de Melo EJT,da Silva FCV,Machado OLT,Gomes VM,de Oliveira Carvalho A

doi

10.1007/s00726-019-02800-8

subject

Has Abstract

pub_date

2019-11-01 00:00:00

pages

1633-1648

issue

10-12

eissn

0939-4451

issn

1438-2199

pii

10.1007/s00726-019-02800-8

journal_volume

51

pub_type

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