Equilibrium unfolding of the PDZ domain of β2-syntrophin

Autores
Torchio, Gabriela María; Ermacora, Mario Roberto; Sica, Mauricio Pablo
Año de publicación
2012
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
b2-syntrophin, a dystrophin-associated protein, plays a pivotal role in insulin secretion by pancreatic b-cells. Itcontains a PDZ domain (b2S-PDZ) that, in complex with protein-tyrosine phosphatase ICA512, anchors the dense insulin gran-ules to actin filaments. The phosphorylation state of b2-syntrophin allosterically regulates the affinity of b2S-PDZ for ICA512,and the disruption of the complex triggers the mobilization of the insulin granule stores. Here, we investigate the thermal unfold-ing of b2S-PDZ at different pH and urea concentrations. Our results indicate that, unlike other PDZ domains, b2S-PDZ is margin-ally stable. Thermal denaturation experiments show broad transitions and cold denaturation, and a two-state model fit revealsa significant unfolded fraction under physiological conditions. Furthermore, Tm and Tmax denaturant-dependent shifts andnoncoincidence of melting curves monitored at different wavelengths suggest that two-state and three-state models fail toexplain the equilibrium data properly and are in better agreement with a downhill scenario. Its higher stability at pH >9 andthe results of molecular dynamics simulations indicate that this behavior of b2S-PDZ might be related to its charge distribution.All together, our results suggest a link between the conformational plasticity of the native ensemble of this PDZ domain and theregulation of insulin secretion.
Fil: Torchio, Gabriela María. Universidad Nacional de Quilmes. Departamento de Ciencia y Tecnología. Laboratorio de Expresion y Plegamiento de Proteinas; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Fil: Ermacora, Mario Roberto. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de Quilmes. Departamento de Ciencia y Tecnología. Laboratorio de Expresion y Plegamiento de Proteinas; Argentina
Fil: Sica, Mauricio Pablo. Universidad Nacional de Quilmes. Departamento de Ciencia y Tecnología. Laboratorio de Expresion y Plegamiento de Proteinas; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Materia
syntrophin
PDZ
unfolding
downhill
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/196602
Acceder
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network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Equilibrium unfolding of the PDZ domain of β2-syntrophinTorchio, Gabriela MaríaErmacora, Mario RobertoSica, Mauricio PablosyntrophinPDZunfoldingdownhillhttps://purl.org/becyt/ford/1.6https://purl.org/becyt/ford/1b2-syntrophin, a dystrophin-associated protein, plays a pivotal role in insulin secretion by pancreatic b-cells. Itcontains a PDZ domain (b2S-PDZ) that, in complex with protein-tyrosine phosphatase ICA512, anchors the dense insulin gran-ules to actin filaments. The phosphorylation state of b2-syntrophin allosterically regulates the affinity of b2S-PDZ for ICA512,and the disruption of the complex triggers the mobilization of the insulin granule stores. Here, we investigate the thermal unfold-ing of b2S-PDZ at different pH and urea concentrations. Our results indicate that, unlike other PDZ domains, b2S-PDZ is margin-ally stable. Thermal denaturation experiments show broad transitions and cold denaturation, and a two-state model fit revealsa significant unfolded fraction under physiological conditions. Furthermore, Tm and Tmax denaturant-dependent shifts andnoncoincidence of melting curves monitored at different wavelengths suggest that two-state and three-state models fail toexplain the equilibrium data properly and are in better agreement with a downhill scenario. Its higher stability at pH >9 andthe results of molecular dynamics simulations indicate that this behavior of b2S-PDZ might be related to its charge distribution.All together, our results suggest a link between the conformational plasticity of the native ensemble of this PDZ domain and theregulation of insulin secretion.Fil: Torchio, Gabriela María. Universidad Nacional de Quilmes. Departamento de Ciencia y Tecnología. Laboratorio de Expresion y Plegamiento de Proteinas; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Ermacora, Mario Roberto. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de Quilmes. Departamento de Ciencia y Tecnología. Laboratorio de Expresion y Plegamiento de Proteinas; ArgentinaFil: Sica, Mauricio Pablo. Universidad Nacional de Quilmes. Departamento de Ciencia y Tecnología. Laboratorio de Expresion y Plegamiento de Proteinas; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaCell Press2012-06info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/196602Torchio, Gabriela María; Ermacora, Mario Roberto; Sica, Mauricio Pablo; Equilibrium unfolding of the PDZ domain of β2-syntrophin; Cell Press; Biophysical Journal; 102; 12; 6-2012; 2835-28440006-3495CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S0006349512005747info:eu-repo/semantics/altIdentifier/doi/10.1016/j.bpj.2012.05.021info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-11-05T10:15:22Zoai:ri.conicet.gov.ar:11336/196602instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-11-05 10:15:23.087CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Equilibrium unfolding of the PDZ domain of β2-syntrophin
title Equilibrium unfolding of the PDZ domain of β2-syntrophin
spellingShingle Equilibrium unfolding of the PDZ domain of β2-syntrophin
Torchio, Gabriela María
syntrophin
PDZ
unfolding
downhill
title_short Equilibrium unfolding of the PDZ domain of β2-syntrophin
title_full Equilibrium unfolding of the PDZ domain of β2-syntrophin
title_fullStr Equilibrium unfolding of the PDZ domain of β2-syntrophin
title_full_unstemmed Equilibrium unfolding of the PDZ domain of β2-syntrophin
title_sort Equilibrium unfolding of the PDZ domain of β2-syntrophin
dc.creator.none.fl_str_mv Torchio, Gabriela María
Ermacora, Mario Roberto
Sica, Mauricio Pablo
author Torchio, Gabriela María
author_facet Torchio, Gabriela María
Ermacora, Mario Roberto
Sica, Mauricio Pablo
author_role author
author2 Ermacora, Mario Roberto
Sica, Mauricio Pablo
author2_role author
author
dc.subject.none.fl_str_mv syntrophin
PDZ
unfolding
downhill
topic syntrophin
PDZ
unfolding
downhill
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.6
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv b2-syntrophin, a dystrophin-associated protein, plays a pivotal role in insulin secretion by pancreatic b-cells. Itcontains a PDZ domain (b2S-PDZ) that, in complex with protein-tyrosine phosphatase ICA512, anchors the dense insulin gran-ules to actin filaments. The phosphorylation state of b2-syntrophin allosterically regulates the affinity of b2S-PDZ for ICA512,and the disruption of the complex triggers the mobilization of the insulin granule stores. Here, we investigate the thermal unfold-ing of b2S-PDZ at different pH and urea concentrations. Our results indicate that, unlike other PDZ domains, b2S-PDZ is margin-ally stable. Thermal denaturation experiments show broad transitions and cold denaturation, and a two-state model fit revealsa significant unfolded fraction under physiological conditions. Furthermore, Tm and Tmax denaturant-dependent shifts andnoncoincidence of melting curves monitored at different wavelengths suggest that two-state and three-state models fail toexplain the equilibrium data properly and are in better agreement with a downhill scenario. Its higher stability at pH >9 andthe results of molecular dynamics simulations indicate that this behavior of b2S-PDZ might be related to its charge distribution.All together, our results suggest a link between the conformational plasticity of the native ensemble of this PDZ domain and theregulation of insulin secretion.
Fil: Torchio, Gabriela María. Universidad Nacional de Quilmes. Departamento de Ciencia y Tecnología. Laboratorio de Expresion y Plegamiento de Proteinas; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Fil: Ermacora, Mario Roberto. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de Quilmes. Departamento de Ciencia y Tecnología. Laboratorio de Expresion y Plegamiento de Proteinas; Argentina
Fil: Sica, Mauricio Pablo. Universidad Nacional de Quilmes. Departamento de Ciencia y Tecnología. Laboratorio de Expresion y Plegamiento de Proteinas; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
description b2-syntrophin, a dystrophin-associated protein, plays a pivotal role in insulin secretion by pancreatic b-cells. Itcontains a PDZ domain (b2S-PDZ) that, in complex with protein-tyrosine phosphatase ICA512, anchors the dense insulin gran-ules to actin filaments. The phosphorylation state of b2-syntrophin allosterically regulates the affinity of b2S-PDZ for ICA512,and the disruption of the complex triggers the mobilization of the insulin granule stores. Here, we investigate the thermal unfold-ing of b2S-PDZ at different pH and urea concentrations. Our results indicate that, unlike other PDZ domains, b2S-PDZ is margin-ally stable. Thermal denaturation experiments show broad transitions and cold denaturation, and a two-state model fit revealsa significant unfolded fraction under physiological conditions. Furthermore, Tm and Tmax denaturant-dependent shifts andnoncoincidence of melting curves monitored at different wavelengths suggest that two-state and three-state models fail toexplain the equilibrium data properly and are in better agreement with a downhill scenario. Its higher stability at pH >9 andthe results of molecular dynamics simulations indicate that this behavior of b2S-PDZ might be related to its charge distribution.All together, our results suggest a link between the conformational plasticity of the native ensemble of this PDZ domain and theregulation of insulin secretion.
publishDate 2012
dc.date.none.fl_str_mv 2012-06
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/196602
Torchio, Gabriela María; Ermacora, Mario Roberto; Sica, Mauricio Pablo; Equilibrium unfolding of the PDZ domain of β2-syntrophin; Cell Press; Biophysical Journal; 102; 12; 6-2012; 2835-2844
0006-3495
CONICET Digital
CONICET
url http://hdl.handle.net/11336/196602
identifier_str_mv Torchio, Gabriela María; Ermacora, Mario Roberto; Sica, Mauricio Pablo; Equilibrium unfolding of the PDZ domain of β2-syntrophin; Cell Press; Biophysical Journal; 102; 12; 6-2012; 2835-2844
0006-3495
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S0006349512005747
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.bpj.2012.05.021
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
dc.publisher.none.fl_str_mv Cell Press
publisher.none.fl_str_mv Cell Press
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
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score 13.087074

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