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Eastern coral snake Micrurus fulvius venom toxicity in mice is mainly determined by neurotoxic phospholipases A2.
J Proteomics. 2014 Jun 13; 105:295-306.JP

Abstract

Here we show for the first time that the venom from an elapid (Micrurus fulvius) contains three finger toxin (3FTxs) peptides with low toxicity but high content of lethal phospholipases A2 (PLA2). The intravenous venom LD50 in mice was 0.3μg/g. Fractionation on a C18 column yielded 22 fractions; in terms of abundance, 58.3% of them were components of 13-14kDa and 24.9% were molecules of 6-7kDa. Two fractions with PLA2 activity represented 33.4% of the whole venom and were the most lethal fractions. Fractions with low molecular mass (<7000Da) partially and reversibly blocked the nicotinic acetylcholine receptor (nAChR), with the exception of one that blocked it completely. The fraction that blocked 100% contained two protein species whose dose-response was determined; the IC50s were 13±1 and 9.5±0.3nM. Despite the apparent effect on nAChR none of the low molecular mass fractions were lethal in mice, at concentrations of 1μg/g. From 2D-PAGE and LC-MS/MS, we identified fourteen species of PLA2, four protein species of C-type lectin, three zinc metalloproteinases, one phosphodiesterase and one 3FTx. The N-terminal amino acid sequence of fractions with biological interest was obtained.

BIOLOGICAL SIGNIFICANCE

In contrast with coral snake venoms from South America, M. fulvius has minor amounts of low molecular mass components, but high content of PLA2, which is responsible for the venom lethality of this species. The results reported here contribute to better understanding of envenomation development and to improve antivenom design and production. These findings break from the paradigm that neurotoxicity caused by Micrurus venoms is mainly attributable to 3FTx neurotoxins and encourage future studies on Micrurus evolution and venom specialization. This article is part of a Special Issue entitled Non-model organisms.

Authors+Show Affiliations

Instituto de Biotecnología, Universidad Nacional Autónoma de México, Av. Universidad # 2001, Colonia Chamilpa, Cuernavaca, Morelos 62210, México.Instituto de Biotecnología, Universidad Nacional Autónoma de México, Av. Universidad # 2001, Colonia Chamilpa, Cuernavaca, Morelos 62210, México.Instituto de Biotecnología, Universidad Nacional Autónoma de México, Av. Universidad # 2001, Colonia Chamilpa, Cuernavaca, Morelos 62210, México.Instituto de Biotecnología, Universidad Nacional Autónoma de México, Av. Universidad # 2001, Colonia Chamilpa, Cuernavaca, Morelos 62210, México.Instituto de Biotecnología, Universidad Nacional Autónoma de México, Av. Universidad # 2001, Colonia Chamilpa, Cuernavaca, Morelos 62210, México.Instituto de Biotecnología, Universidad Nacional Autónoma de México, Av. Universidad # 2001, Colonia Chamilpa, Cuernavaca, Morelos 62210, México.Instituto de Biotecnología, Universidad Nacional Autónoma de México, Av. Universidad # 2001, Colonia Chamilpa, Cuernavaca, Morelos 62210, México.Instituto de Biotecnología, Universidad Nacional Autónoma de México, Av. Universidad # 2001, Colonia Chamilpa, Cuernavaca, Morelos 62210, México. Electronic address: alagon@ibt.unam.mx.

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

24613619

Citation

Vergara, Irene, et al. "Eastern Coral Snake Micrurus Fulvius Venom Toxicity in Mice Is Mainly Determined By Neurotoxic Phospholipases A2." Journal of Proteomics, vol. 105, 2014, pp. 295-306.
Vergara I, Pedraza-Escalona M, Paniagua D, et al. Eastern coral snake Micrurus fulvius venom toxicity in mice is mainly determined by neurotoxic phospholipases A2. J Proteomics. 2014;105:295-306.
Vergara, I., Pedraza-Escalona, M., Paniagua, D., Restano-Cassulini, R., Zamudio, F., Batista, C. V., Possani, L. D., & Alagón, A. (2014). Eastern coral snake Micrurus fulvius venom toxicity in mice is mainly determined by neurotoxic phospholipases A2. Journal of Proteomics, 105, 295-306. https://doi.org/10.1016/j.jprot.2014.02.027
Vergara I, et al. Eastern Coral Snake Micrurus Fulvius Venom Toxicity in Mice Is Mainly Determined By Neurotoxic Phospholipases A2. J Proteomics. 2014 Jun 13;105:295-306. PubMed PMID: 24613619.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Eastern coral snake Micrurus fulvius venom toxicity in mice is mainly determined by neurotoxic phospholipases A2. AU - Vergara,Irene, AU - Pedraza-Escalona,Martha, AU - Paniagua,Dayanira, AU - Restano-Cassulini,Rita, AU - Zamudio,Fernando, AU - Batista,Cesar V F, AU - Possani,Lourival D, AU - Alagón,Alejandro, Y1 - 2014/03/05/ PY - 2014/01/02/received PY - 2014/02/21/revised PY - 2014/02/24/accepted PY - 2014/3/12/entrez PY - 2014/3/13/pubmed PY - 2015/2/13/medline KW - Coral snake KW - Mass spectrometry KW - Micrurus fulvius KW - Neurotoxicity KW - Proteome SP - 295 EP - 306 JF - Journal of proteomics JO - J Proteomics VL - 105 N2 - UNLABELLED: Here we show for the first time that the venom from an elapid (Micrurus fulvius) contains three finger toxin (3FTxs) peptides with low toxicity but high content of lethal phospholipases A2 (PLA2). The intravenous venom LD50 in mice was 0.3μg/g. Fractionation on a C18 column yielded 22 fractions; in terms of abundance, 58.3% of them were components of 13-14kDa and 24.9% were molecules of 6-7kDa. Two fractions with PLA2 activity represented 33.4% of the whole venom and were the most lethal fractions. Fractions with low molecular mass (<7000Da) partially and reversibly blocked the nicotinic acetylcholine receptor (nAChR), with the exception of one that blocked it completely. The fraction that blocked 100% contained two protein species whose dose-response was determined; the IC50s were 13±1 and 9.5±0.3nM. Despite the apparent effect on nAChR none of the low molecular mass fractions were lethal in mice, at concentrations of 1μg/g. From 2D-PAGE and LC-MS/MS, we identified fourteen species of PLA2, four protein species of C-type lectin, three zinc metalloproteinases, one phosphodiesterase and one 3FTx. The N-terminal amino acid sequence of fractions with biological interest was obtained. BIOLOGICAL SIGNIFICANCE: In contrast with coral snake venoms from South America, M. fulvius has minor amounts of low molecular mass components, but high content of PLA2, which is responsible for the venom lethality of this species. The results reported here contribute to better understanding of envenomation development and to improve antivenom design and production. These findings break from the paradigm that neurotoxicity caused by Micrurus venoms is mainly attributable to 3FTx neurotoxins and encourage future studies on Micrurus evolution and venom specialization. This article is part of a Special Issue entitled Non-model organisms. SN - 1876-7737 UR - https://www.unboundmedicine.com/medline/citation/24613619/Eastern_coral_snake_Micrurus_fulvius_venom_toxicity_in_mice_is_mainly_determined_by_neurotoxic_phospholipases_A2_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S1874-3919(14)00091-8 DB - PRIME DP - Unbound Medicine ER -