Engineered protein containing crotoxin epitopes induces neutralizing antibodies in immunized rabbits.

Abstract:

:Crotoxin (Ctx) is the main lethal component of Crotalus durissus terrificus venom. It is a neurotoxin, composed of two subunits associated by noncovalent interactions, the non-toxic acid subunit (CA), named Crotapotin, and the basic subunit (CB), with phospholipase A2 (PLA2) activity. Employing the SPOT synthesis technique, we determined two epitopes located in the C-terminal of each Ctx subunit. In addition, 3 other epitopes were mapped in different regions of Ctx using subcutaneous spot implants surgically inserted in mice. All epitopes mapped here were expressed together as recombinant multi-epitopic protein (rMEPCtx), which was used to immunize New Zealand rabbits. Anti-rMEPCtx rabbit serum cross-reacted with Ctx and crude venoms from C. d. terrificus, Crotalus durissus ruruima, Peruvian C. durissus and Bothrops jararaca (with lower intensity). Furthermore, anti-rMEPCtx serum was able to neutralize Ctx lethal activity. As the recombinant multiepitopic protein is not toxic, it can be administered in larger doses without causing adverse effects on the immunized animals health. Therefore, our work evidences the identification of neutralizing epitopes of Ctx and support the use of recombinant multiepitopic proteins as an innovation to immunotherapeutics production.

journal_name

Mol Immunol

journal_title

Molecular immunology

authors

Molina Molina DA,Guerra-Duarte C,Costal-Oliveira F,Almeida Rocha E,Rego Rodrigues C,Machado-de-Ávila RA,Soccol VT,Chávez-Olórtegui C

doi

10.1016/j.molimm.2020.01.012

subject

Has Abstract

pub_date

2020-03-01 00:00:00

pages

144-153

eissn

0161-5890

issn

1872-9142

pii

S0161-5890(19)30649-2

journal_volume

119

pub_type

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