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Toxins 2018, 10(4), 142; https://doi.org/10.3390/toxins10040142

Camelid Single-Domain Antibodies (VHHs) against Crotoxin: A Basis for Developing Modular Building Blocks for the Enhancement of Treatment or Diagnosis of Crotalic Envenoming

1
Fundação Oswaldo Cruz, Fiocruz Rondônia, Porto Velho, 76812-245 Rondônia, Brazil
2
Instituto Federal de Educação, Ciência e Tecnologia de Rondônia, IFRO, Guajará-Mirim, 76850-000 Rondônia, Brazil
3
Universidade Federal Fluminense, UFF, Rio de Janeiro, 24220-900 Rio de Janeiro, Brazil
4
Embrapa Agroindústria Tropical, Fortaleza, 60020-181 Ceará, Brazil
5
Universidade Federal de Rondônia, UNIR, Porto Velho, 76801-974 Rondônia, Brazil
6
Centro Universitário São Lucas, UniSL, 76812-245 Porto Velho-RO, Brazil
7
Plataforma Bi-institucional de Pesquisa em Medicina Translacional, Fiocruz-USP, Ribeirão Preto, 14049-900 São Paulo, Brazil
8
Departamento de Medicina da Universidade Federal de São Carlos, Demed-UFSCAR, São Carlos, 13565-905 São Paulo, Brazil
*
Authors to whom correspondence should be addressed.
Received: 1 February 2018 / Revised: 11 March 2018 / Accepted: 16 March 2018 / Published: 29 March 2018
(This article belongs to the Special Issue Discovery of Antibodies and Novel Antivenoms against Envenoming)
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Abstract

Toxic effects triggered by crotalic envenoming are mainly related to crotoxin (CTX), composed of a phospholipase A2 (CB) and a subunit with no toxic activity (CA). Camelids produce immunoglobulins G devoid of light chains, in which the antigen recognition domain is called VHH. Given their unique characteristics, VHHs were selected using Phage Display against CTX from Crotalus durissus terrificus. After three rounds of biopanning, four sequence profiles for CB (KF498602, KF498603, KF498604, and KF498605) and one for CA (KF498606) were revealed. All clones presented the VHH hallmark in FR2 and a long CDR3, with the exception of KF498606. After expressing pET22b-VHHs in E. coli, approximately 2 to 6 mg of protein per liter of culture were obtained. When tested for cross-reactivity, VHHs presented specificity for the Crotalus genus and were capable of recognizing CB through Western blot. KF498602 and KF498604 showed thermostability, and displayed affinity constants for CTX in the micro or nanomolar range. They inhibited in vitro CTX PLA2 activity, and CB cytotoxicity. Furthermore, KF498604 inhibited the CTX-induced myotoxicity in mice by 78.8%. Molecular docking revealed that KF498604 interacts with the CA–CB interface of CTX, seeming to block substrate access. Selected VHHs may be alternatives for the crotalic envenoming treatment. View Full-Text
Keywords: crotoxin; CB; VHH; Crotalus durissus terrificus crotoxin; CB; VHH; Crotalus durissus terrificus
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Luiz, M.B.; Pereira, S.S.; Prado, N.D.R.; Gonçalves, N.R.; Kayano, A.M.; Moreira-Dill, L.S.; Sobrinho, J.C.; Zanchi, F.B.; Fuly, A.L.; Fernandes, C.F.; Zuliani, J.P.; Soares, A.M.; Stabeli, R.G.; Fernandes, C.F.C. Camelid Single-Domain Antibodies (VHHs) against Crotoxin: A Basis for Developing Modular Building Blocks for the Enhancement of Treatment or Diagnosis of Crotalic Envenoming. Toxins 2018, 10, 142.

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