Functional and structural studies of a Phospholipase A2-like protein complexed to zinc ions: Insights on its myotoxicity and inhibition mechanism

One of the main challenges in snakebite envenomation treatment is the development of stable, versatile and efficient anti-venom therapies. Local myotoxicity in accidents involving snakes from the Bothrops genus is still a consequence of serum therapy inefficient neutralization that may lead to perma...

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Published inBiochimica et biophysica acta. General subjects Vol. 1861; no. 1; pp. 3199 - 3209
Main Authors Borges, Rafael J., Cardoso, Fábio F., Fernandes, Carlos A.H., Dreyer, Thiago R., de Moraes, Delkia S., Floriano, Rafael S., Rodrigues-Simioni, Léa, Fontes, Marcos R.M.
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.01.2017
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ISSN0304-4165
1872-8006
DOI10.1016/j.bbagen.2016.08.003

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Abstract One of the main challenges in snakebite envenomation treatment is the development of stable, versatile and efficient anti-venom therapies. Local myotoxicity in accidents involving snakes from the Bothrops genus is still a consequence of serum therapy inefficient neutralization that may lead to permanent sequelae in their victims. One of the classes of toxins that participate in muscle necrosis is the PLA2-like proteins. The aim of this work was to investigate the role of zinc ions in the inhibition of PLA2-like proteins and to advance the current knowledge of their action mechanism. Myographic and electrophysiological techniques were used to evaluate the inhibitory effect of zinc ions, isothermal titration calorimetry assays were used to measure the affinity between zinc ions and the toxin and X-ray crystallography was used to reveal details of this interaction. We demonstrated that zinc ions can effectively inhibit the toxin by the interaction with two different sites, which are related to two different mechanism of inhibition: preventing membrane disruption and impairing the toxin state transition. Furthermore, structural study presented here included an additional step in the current myotoxic mechanism improving the comprehension of the allosteric transition that PLA2-like proteins undergo to exert their function. Our findings show that zinc ions are inhibitors of PLA2-like proteins and suggest two different mechanisms of inhibition for these ions. Zinc is a new candidate that can assist in anti-venom treatments and can promote the design of new and even more accurate structure-based inhibitors for PLA2-like proteins. •Zinc ions inhibit phospholipase A2-like toxins by interaction with two different sites.•Zinc ions prevent membrane disruption by the interacting with toxin C-termini.•Zinc ions impair the toxin state transition leading to its inhibition.•The structural transition between different toxin states was fully described.•A comprehensive hypothesis for myotoxic mechanism composed by 7 steps is proposed.
AbstractList One of the main challenges in snakebite envenomation treatment is the development of stable, versatile and efficient anti-venom therapies. Local myotoxicity in accidents involving snakes from the Bothrops genus is still a consequence of serum therapy inefficient neutralization that may lead to permanent sequelae in their victims. One of the classes of toxins that participate in muscle necrosis is the PLA2-like proteins. The aim of this work was to investigate the role of zinc ions in the inhibition of PLA2-like proteins and to advance the current knowledge of their action mechanism.Myographic and electrophysiological techniques were used to evaluate the inhibitory effect of zinc ions, isothermal titration calorimetry assays were used to measure the affinity between zinc ions and the toxin and X-ray crystallography was used to reveal details of this interaction.We demonstrated that zinc ions can effectively inhibit the toxin by the interaction with two different sites, which are related to two different mechanism of inhibition: preventing membrane disruption and impairing the toxin state transition. Furthermore, structural study presented here included an additional step in the current myotoxic mechanism improving the comprehension of the allosteric transition that PLA2-like proteins undergo to exert their function.Our findings show that zinc ions are inhibitors of PLA2-like proteins and suggest two different mechanisms of inhibition for these ions.Zinc is a new candidate that can assist in anti-venom treatments and can promote the design of new and even more accurate structure-based inhibitors for PLA2-like proteins.
One of the main challenges in snakebite envenomation treatment is the development of stable, versatile and efficient anti-venom therapies. Local myotoxicity in accidents involving snakes from the Bothrops genus is still a consequence of serum therapy inefficient neutralization that may lead to permanent sequelae in their victims. One of the classes of toxins that participate in muscle necrosis is the PLA2-like proteins. The aim of this work was to investigate the role of zinc ions in the inhibition of PLA2-like proteins and to advance the current knowledge of their action mechanism. Myographic and electrophysiological techniques were used to evaluate the inhibitory effect of zinc ions, isothermal titration calorimetry assays were used to measure the affinity between zinc ions and the toxin and X-ray crystallography was used to reveal details of this interaction. We demonstrated that zinc ions can effectively inhibit the toxin by the interaction with two different sites, which are related to two different mechanism of inhibition: preventing membrane disruption and impairing the toxin state transition. Furthermore, structural study presented here included an additional step in the current myotoxic mechanism improving the comprehension of the allosteric transition that PLA2-like proteins undergo to exert their function. Our findings show that zinc ions are inhibitors of PLA2-like proteins and suggest two different mechanisms of inhibition for these ions. Zinc is a new candidate that can assist in anti-venom treatments and can promote the design of new and even more accurate structure-based inhibitors for PLA2-like proteins. •Zinc ions inhibit phospholipase A2-like toxins by interaction with two different sites.•Zinc ions prevent membrane disruption by the interacting with toxin C-termini.•Zinc ions impair the toxin state transition leading to its inhibition.•The structural transition between different toxin states was fully described.•A comprehensive hypothesis for myotoxic mechanism composed by 7 steps is proposed.
One of the main challenges in snakebite envenomation treatment is the development of stable, versatile and efficient anti-venom therapies. Local myotoxicity in accidents involving snakes from the Bothrops genus is still a consequence of serum therapy inefficient neutralization that may lead to permanent sequelae in their victims. One of the classes of toxins that participate in muscle necrosis is the PLA2-like proteins. The aim of this work was to investigate the role of zinc ions in the inhibition of PLA2-like proteins and to advance the current knowledge of their action mechanism.BACKGROUNDOne of the main challenges in snakebite envenomation treatment is the development of stable, versatile and efficient anti-venom therapies. Local myotoxicity in accidents involving snakes from the Bothrops genus is still a consequence of serum therapy inefficient neutralization that may lead to permanent sequelae in their victims. One of the classes of toxins that participate in muscle necrosis is the PLA2-like proteins. The aim of this work was to investigate the role of zinc ions in the inhibition of PLA2-like proteins and to advance the current knowledge of their action mechanism.Myographic and electrophysiological techniques were used to evaluate the inhibitory effect of zinc ions, isothermal titration calorimetry assays were used to measure the affinity between zinc ions and the toxin and X-ray crystallography was used to reveal details of this interaction.METHODSMyographic and electrophysiological techniques were used to evaluate the inhibitory effect of zinc ions, isothermal titration calorimetry assays were used to measure the affinity between zinc ions and the toxin and X-ray crystallography was used to reveal details of this interaction.We demonstrated that zinc ions can effectively inhibit the toxin by the interaction with two different sites, which are related to two different mechanism of inhibition: preventing membrane disruption and impairing the toxin state transition. Furthermore, structural study presented here included an additional step in the current myotoxic mechanism improving the comprehension of the allosteric transition that PLA2-like proteins undergo to exert their function.RESULTSWe demonstrated that zinc ions can effectively inhibit the toxin by the interaction with two different sites, which are related to two different mechanism of inhibition: preventing membrane disruption and impairing the toxin state transition. Furthermore, structural study presented here included an additional step in the current myotoxic mechanism improving the comprehension of the allosteric transition that PLA2-like proteins undergo to exert their function.Our findings show that zinc ions are inhibitors of PLA2-like proteins and suggest two different mechanisms of inhibition for these ions.CONCLUSIONSOur findings show that zinc ions are inhibitors of PLA2-like proteins and suggest two different mechanisms of inhibition for these ions.Zinc is a new candidate that can assist in anti-venom treatments and can promote the design of new and even more accurate structure-based inhibitors for PLA2-like proteins.GENERAL SIGNIFICANCEZinc is a new candidate that can assist in anti-venom treatments and can promote the design of new and even more accurate structure-based inhibitors for PLA2-like proteins.
Author Dreyer, Thiago R.
Cardoso, Fábio F.
Floriano, Rafael S.
Borges, Rafael J.
Fernandes, Carlos A.H.
de Moraes, Delkia S.
Rodrigues-Simioni, Léa
Fontes, Marcos R.M.
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  organization: Departamento de Física e Biofísica, Instituto de Biociências, Universidade Estadual Paulista (UNESP), Rua Prof. Dr. Antonio Celso Wagner Zanin, s/n, 18618-689 Botucatu, SP, Brazil
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  givenname: Carlos A.H.
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  surname: de Moraes
  fullname: de Moraes, Delkia S.
  organization: Departamento de Farmacologia, Faculdade de Ciências Médicas, Universidade Estadual de Campinas (UNICAMP), Rua Tessália Vieira de Camargo, 126, 13083-862 Campinas, SP, Brazil
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  givenname: Rafael S.
  surname: Floriano
  fullname: Floriano, Rafael S.
  organization: Departamento de Farmacologia, Faculdade de Ciências Médicas, Universidade Estadual de Campinas (UNICAMP), Rua Tessália Vieira de Camargo, 126, 13083-862 Campinas, SP, Brazil
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  fullname: Rodrigues-Simioni, Léa
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  givenname: Marcos R.M.
  surname: Fontes
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  email: fontes@ibb.unesp.br
  organization: Departamento de Física e Biofísica, Instituto de Biociências, Universidade Estadual Paulista (UNESP), Rua Prof. Dr. Antonio Celso Wagner Zanin, s/n, 18618-689 Botucatu, SP, Brazil
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Issue 1
Keywords Myotoxic mechanism
Resting potential
Snake venom
Phospholipase A2
p-bromophenacyl bromide
Phrenic nerve-diaphragm
Protein Data Bank identification code
X-ray crystallography
Root-mean square deviation
Membrane-Disruption Site
Polyethylene glycol
PLA2-like proteins
Membrane-Docking Site
Zinc ions
Bothropstoxin I
Inhibition by divalent ions
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Snippet One of the main challenges in snakebite envenomation treatment is the development of stable, versatile and efficient anti-venom therapies. Local myotoxicity in...
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SubjectTerms accidents
blood serum
Bothrops
calorimetry
complications (disease)
electrophysiology
Inhibition by divalent ions
ions
muscles
Myotoxic mechanism
necrosis
neutralization
PLA2-like proteins
proteins
snake bites
Snake venom
snakes
therapeutics
titration
toxins
X-ray crystallography
X-ray diffraction
zinc
Zinc ions
Title Functional and structural studies of a Phospholipase A2-like protein complexed to zinc ions: Insights on its myotoxicity and inhibition mechanism
URI https://dx.doi.org/10.1016/j.bbagen.2016.08.003
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