Brown Spiders’ Phospholipases-D with Potential Therapeutic Applications: Functional Assessment of Mutant Isoforms

da Silva, Thaís Pereira and de Castro, Fernando Jacomini and Vuitika, Larissa and Polli, Nayanne Louise Costacurta and Antunes, Bruno César and Bóia-Ferreira, Marianna and Minozzo, João Carlos and Mariutti, Ricardo Barros and Matsubara, Fernando Hitomi and Arni, Raghuvir Krishnaswamy and Wille, Ana Carolina Martins and Senff-Ribeiro, Andrea and Gremski, Luiza Helena and Veiga, Silvio Sanches (2021) Brown Spiders’ Phospholipases-D with Potential Therapeutic Applications: Functional Assessment of Mutant Isoforms. Biomedicines, 9 (3). p. 320. ISSN 2227-9059

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Abstract

Phospholipases-D (PLDs) found in Loxosceles spiders’ venoms are responsible for the dermonecrosis triggered by envenomation. PLDs can also induce other local and systemic effects, such as massive inflammatory response, edema, and hemolysis. Recombinant PLDs reproduce all of the deleterious effects induced by Loxosceles whole venoms. Herein, wild type and mutant PLDs of two species involved in accidents—L. gaucho and L. laeta—were recombinantly expressed and characterized. The mutations are related to amino acid residues relevant for catalysis (H12-H47), magnesium ion coordination (E32-D34) and binding to phospholipid substrates (Y228 and Y228-Y229-W230). Circular dichroism and structural data demonstrated that the mutant isoforms did not undergo significant structural changes. Immunoassays showed that mutant PLDs exhibit conserved epitopes and kept their antigenic properties despite the mutations. Both in vitro (sphingomyelinase activity and hemolysis) and in vivo (capillary permeability, dermonecrotic activity, and histopathological analysis) assays showed that the PLDs with mutations H12-H47, E32-D34, and Y228-Y229-W230 displayed only residual activities. Results indicate that these mutant toxins are suitable for use as antigens to obtain neutralizing antisera with enhanced properties since they will be based on the most deleterious toxins in the venom and without causing severe harmful effects to the animals in which these sera are produced.

Item Type: Article
Subjects: Scholar Eprints > Biological Science
Depositing User: Managing Editor
Date Deposited: 21 Jan 2023 05:11
Last Modified: 26 Oct 2024 04:06
URI: http://repository.stmscientificarchives.com/id/eprint/1196

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