Effect of Surface Charge on the Interfacial Orientation and Conformation of FB1 in Model Membranes
- Autores
- Theumer, Martín Gustavo; Clop, Pedro Diego; Rubinstein, Héctor Ramón; Perillo, Maria Angelica
- Año de publicación
- 2012
- Idioma
- inglés
- Tipo de recurso
- artículo
- Estado
- versión publicada
- Descripción
- The toxicity of FB1 is usually explained through the enzymatic disruption of lipidic metabolism. However, it may lie in the thermodynamics of the membrane and its cooperative phase behavior rather than in the activity of individual proteins. Here, we investigate the effects of FB1 at the molecular and mesoscopic levels in FB1–phospholipid mixed Langmuir films. Mean molecular area vs FB1 molar fractions (xFB1) and phase diagram analysis allowed us to define miscibility conditions and phase states at different xFB1. Surface potential measurements, evaluated as a function of the molecular packing and xFB1, revealed the FB1-induced change in the collective dipolar reorientation leaded to neutralization of charged films. Size, shape, and distribution of 2D-domain analysis from epifluorescence data suggested the increase in the mixing entropy and film relaxation rate. Finally, PM-IRRAS revealed the orientation of FB1 with the amine end (zwitterionic and negatively charged monolayers) or the tricarballylic acid end (positively charged monolayers) pointing to the air. The globular-extended conformational equilibrium of FB1 is dynamically defined by the membrane charge becoming a toxicity enhancing factor. The specificity of the toxin–protein interaction might also be perturbed by the FB1-induced remodeling of the membrane topography by affecting the raft-like platforms where membrane enzymes are considered to be located.
Fil: Theumer, Martín Gustavo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones Biológicas y Tecnológicas. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas, Físicas y Naturales. Instituto de Investigaciones Biológicas y Tecnológicas; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Córdoba. Centro de Investigaciones en Bioquímica Clínica e Inmunología; Argentina
Fil: Clop, Pedro Diego. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones Biológicas y Tecnológicas. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas, Físicas y Naturales. Instituto de Investigaciones Biológicas y Tecnológicas; Argentina
Fil: Rubinstein, Héctor Ramón. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Córdoba. Centro de Investigaciones en Bioquímica Clínica e Inmunología; Argentina
Fil: Perillo, Maria Angelica. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones Biológicas y Tecnológicas. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas, Físicas y Naturales. Instituto de Investigaciones Biológicas y Tecnológicas; Argentina - Materia
-
MYCOTOXINS
FUMONISIN B1
EPIFLUORESCENCE MICROSCOPY
LANGMUIR FILMSPM-IRRAS. - Nivel de accesibilidad
- acceso abierto
- Condiciones de uso
- https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
- Repositorio
- Institución
- Consejo Nacional de Investigaciones Científicas y Técnicas
- OAI Identificador
- oai:ri.conicet.gov.ar:11336/267970
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Effect of Surface Charge on the Interfacial Orientation and Conformation of FB1 in Model MembranesTheumer, Martín GustavoClop, Pedro DiegoRubinstein, Héctor RamónPerillo, Maria AngelicaMYCOTOXINSFUMONISIN B1EPIFLUORESCENCE MICROSCOPYLANGMUIR FILMSPM-IRRAS.https://purl.org/becyt/ford/1.6https://purl.org/becyt/ford/1The toxicity of FB1 is usually explained through the enzymatic disruption of lipidic metabolism. However, it may lie in the thermodynamics of the membrane and its cooperative phase behavior rather than in the activity of individual proteins. Here, we investigate the effects of FB1 at the molecular and mesoscopic levels in FB1–phospholipid mixed Langmuir films. Mean molecular area vs FB1 molar fractions (xFB1) and phase diagram analysis allowed us to define miscibility conditions and phase states at different xFB1. Surface potential measurements, evaluated as a function of the molecular packing and xFB1, revealed the FB1-induced change in the collective dipolar reorientation leaded to neutralization of charged films. Size, shape, and distribution of 2D-domain analysis from epifluorescence data suggested the increase in the mixing entropy and film relaxation rate. Finally, PM-IRRAS revealed the orientation of FB1 with the amine end (zwitterionic and negatively charged monolayers) or the tricarballylic acid end (positively charged monolayers) pointing to the air. The globular-extended conformational equilibrium of FB1 is dynamically defined by the membrane charge becoming a toxicity enhancing factor. The specificity of the toxin–protein interaction might also be perturbed by the FB1-induced remodeling of the membrane topography by affecting the raft-like platforms where membrane enzymes are considered to be located.Fil: Theumer, Martín Gustavo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones Biológicas y Tecnológicas. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas, Físicas y Naturales. Instituto de Investigaciones Biológicas y Tecnológicas; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Córdoba. Centro de Investigaciones en Bioquímica Clínica e Inmunología; ArgentinaFil: Clop, Pedro Diego. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones Biológicas y Tecnológicas. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas, Físicas y Naturales. Instituto de Investigaciones Biológicas y Tecnológicas; ArgentinaFil: Rubinstein, Héctor Ramón. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Córdoba. Centro de Investigaciones en Bioquímica Clínica e Inmunología; ArgentinaFil: Perillo, Maria Angelica. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones Biológicas y Tecnológicas. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas, Físicas y Naturales. Instituto de Investigaciones Biológicas y Tecnológicas; ArgentinaAmerican Chemical Society2012-12info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/267970Theumer, Martín Gustavo; Clop, Pedro Diego; Rubinstein, Héctor Ramón; Perillo, Maria Angelica; Effect of Surface Charge on the Interfacial Orientation and Conformation of FB1 in Model Membranes; American Chemical Society; Journal of Physical Chemistry B; 116; 49; 12-2012; 14216-142271520-6106CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://pubs.acs.org/doi/10.1021/jp306350kinfo:eu-repo/semantics/altIdentifier/doi/10.1021/jp306350kinfo:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T10:41:05Zoai:ri.conicet.gov.ar:11336/267970instacron: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:34982025-09-29 10:41:05.378CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse |
dc.title.none.fl_str_mv |
Effect of Surface Charge on the Interfacial Orientation and Conformation of FB1 in Model Membranes |
title |
Effect of Surface Charge on the Interfacial Orientation and Conformation of FB1 in Model Membranes |
spellingShingle |
Effect of Surface Charge on the Interfacial Orientation and Conformation of FB1 in Model Membranes Theumer, Martín Gustavo MYCOTOXINS FUMONISIN B1 EPIFLUORESCENCE MICROSCOPY LANGMUIR FILMSPM-IRRAS. |
title_short |
Effect of Surface Charge on the Interfacial Orientation and Conformation of FB1 in Model Membranes |
title_full |
Effect of Surface Charge on the Interfacial Orientation and Conformation of FB1 in Model Membranes |
title_fullStr |
Effect of Surface Charge on the Interfacial Orientation and Conformation of FB1 in Model Membranes |
title_full_unstemmed |
Effect of Surface Charge on the Interfacial Orientation and Conformation of FB1 in Model Membranes |
title_sort |
Effect of Surface Charge on the Interfacial Orientation and Conformation of FB1 in Model Membranes |
dc.creator.none.fl_str_mv |
Theumer, Martín Gustavo Clop, Pedro Diego Rubinstein, Héctor Ramón Perillo, Maria Angelica |
author |
Theumer, Martín Gustavo |
author_facet |
Theumer, Martín Gustavo Clop, Pedro Diego Rubinstein, Héctor Ramón Perillo, Maria Angelica |
author_role |
author |
author2 |
Clop, Pedro Diego Rubinstein, Héctor Ramón Perillo, Maria Angelica |
author2_role |
author author author |
dc.subject.none.fl_str_mv |
MYCOTOXINS FUMONISIN B1 EPIFLUORESCENCE MICROSCOPY LANGMUIR FILMSPM-IRRAS. |
topic |
MYCOTOXINS FUMONISIN B1 EPIFLUORESCENCE MICROSCOPY LANGMUIR FILMSPM-IRRAS. |
purl_subject.fl_str_mv |
https://purl.org/becyt/ford/1.6 https://purl.org/becyt/ford/1 |
dc.description.none.fl_txt_mv |
The toxicity of FB1 is usually explained through the enzymatic disruption of lipidic metabolism. However, it may lie in the thermodynamics of the membrane and its cooperative phase behavior rather than in the activity of individual proteins. Here, we investigate the effects of FB1 at the molecular and mesoscopic levels in FB1–phospholipid mixed Langmuir films. Mean molecular area vs FB1 molar fractions (xFB1) and phase diagram analysis allowed us to define miscibility conditions and phase states at different xFB1. Surface potential measurements, evaluated as a function of the molecular packing and xFB1, revealed the FB1-induced change in the collective dipolar reorientation leaded to neutralization of charged films. Size, shape, and distribution of 2D-domain analysis from epifluorescence data suggested the increase in the mixing entropy and film relaxation rate. Finally, PM-IRRAS revealed the orientation of FB1 with the amine end (zwitterionic and negatively charged monolayers) or the tricarballylic acid end (positively charged monolayers) pointing to the air. The globular-extended conformational equilibrium of FB1 is dynamically defined by the membrane charge becoming a toxicity enhancing factor. The specificity of the toxin–protein interaction might also be perturbed by the FB1-induced remodeling of the membrane topography by affecting the raft-like platforms where membrane enzymes are considered to be located. Fil: Theumer, Martín Gustavo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones Biológicas y Tecnológicas. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas, Físicas y Naturales. Instituto de Investigaciones Biológicas y Tecnológicas; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Córdoba. Centro de Investigaciones en Bioquímica Clínica e Inmunología; Argentina Fil: Clop, Pedro Diego. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones Biológicas y Tecnológicas. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas, Físicas y Naturales. Instituto de Investigaciones Biológicas y Tecnológicas; Argentina Fil: Rubinstein, Héctor Ramón. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Córdoba. Centro de Investigaciones en Bioquímica Clínica e Inmunología; Argentina Fil: Perillo, Maria Angelica. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones Biológicas y Tecnológicas. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas, Físicas y Naturales. Instituto de Investigaciones Biológicas y Tecnológicas; Argentina |
description |
The toxicity of FB1 is usually explained through the enzymatic disruption of lipidic metabolism. However, it may lie in the thermodynamics of the membrane and its cooperative phase behavior rather than in the activity of individual proteins. Here, we investigate the effects of FB1 at the molecular and mesoscopic levels in FB1–phospholipid mixed Langmuir films. Mean molecular area vs FB1 molar fractions (xFB1) and phase diagram analysis allowed us to define miscibility conditions and phase states at different xFB1. Surface potential measurements, evaluated as a function of the molecular packing and xFB1, revealed the FB1-induced change in the collective dipolar reorientation leaded to neutralization of charged films. Size, shape, and distribution of 2D-domain analysis from epifluorescence data suggested the increase in the mixing entropy and film relaxation rate. Finally, PM-IRRAS revealed the orientation of FB1 with the amine end (zwitterionic and negatively charged monolayers) or the tricarballylic acid end (positively charged monolayers) pointing to the air. The globular-extended conformational equilibrium of FB1 is dynamically defined by the membrane charge becoming a toxicity enhancing factor. The specificity of the toxin–protein interaction might also be perturbed by the FB1-induced remodeling of the membrane topography by affecting the raft-like platforms where membrane enzymes are considered to be located. |
publishDate |
2012 |
dc.date.none.fl_str_mv |
2012-12 |
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/11336/267970 Theumer, Martín Gustavo; Clop, Pedro Diego; Rubinstein, Héctor Ramón; Perillo, Maria Angelica; Effect of Surface Charge on the Interfacial Orientation and Conformation of FB1 in Model Membranes; American Chemical Society; Journal of Physical Chemistry B; 116; 49; 12-2012; 14216-14227 1520-6106 CONICET Digital CONICET |
url |
http://hdl.handle.net/11336/267970 |
identifier_str_mv |
Theumer, Martín Gustavo; Clop, Pedro Diego; Rubinstein, Héctor Ramón; Perillo, Maria Angelica; Effect of Surface Charge on the Interfacial Orientation and Conformation of FB1 in Model Membranes; American Chemical Society; Journal of Physical Chemistry B; 116; 49; 12-2012; 14216-14227 1520-6106 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://pubs.acs.org/doi/10.1021/jp306350k info:eu-repo/semantics/altIdentifier/doi/10.1021/jp306350k |
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 application/pdf application/pdf application/pdf |
dc.publisher.none.fl_str_mv |
American Chemical Society |
publisher.none.fl_str_mv |
American Chemical Society |
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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1844614440557740032 |
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13.070432 |