Resolution of complex fluorescence spectra of lipids and nicotinic acetylcholine receptor by multivariate analysis reveals protein-mediated effects on the receptor's immediate lipi...
- Autores
- Wenz, Jorge Javier; Barrantes, Francisco Jose
- Año de publicación
- 2008
- Idioma
- inglés
- Tipo de recurso
- artículo
- Estado
- versión publicada
- Descripción
- Analysis of fluorescent spectra from comp lex biological systems containing various fluorescent probes with overlapping emissi on bands is a challenging task. Valuable information can be extracted from the full spectra, however, by using multivariate analysis (MA) of measurements at differen t wavelengths. We a pplied MA to spectral data of purified Torpedo nicotinic acetylcholine receptor (AChR) protein reconstituted into liposomes made up of diol eoylphosphatidic acid (DOPA) and dioleoylphosphatidylcholine (DOPC) doped with two ex trinsic fluorescent probes (NBD-cholesterol/pyrene-PC). Förster re sonance energy transfer (FRET) was observed between the protein and pyre ne-PC and between pyrene-PC and NBD- cholesterol, leading to overlapping emission bands. Partial least squares analysis was applied to fluorescence spectra of pyrene -PC in liposomes with different DOPC/DOPA ratios, generating a model that was tested by an internal validation (leave-one-out cross-validation) and was further used to predict the apparent lipid molar ratio in AChR-containing samples. The values predi cted for DOPA, the lipid with the highest Tm, indicate that the protein exerts a rigidi fying effect on its lipid microenvironment. A similar conclusion was reached from excime r formation of pyrene -PC, a collisional- dependent phenomenon. The excimer/monome r ratio (E/M) at different DOPC/DOPA molar ratios revealed the restricted diffusio n of the probe in AChR-containing samples in comparison to pure lipid samples devoid of protein. FRET from the AChR (donor) to pyrene-PC (acceptor) as a function of temperature was found to increase with increasing temperature, suggesting a shorte r distance between AChR and pyrene PC. Taken together, the results obtained by MA on complex spectra indicate that the AChR rigidifies its surrounding lipid and prefers DOPA rather than DOPC in its immediate microenvironment.
Fil: Wenz, Jorge Javier. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto de Investigaciones Bioquímicas de Bahía Blanca. Universidad Nacional del Sur. Instituto de Investigaciones Bioquímicas de Bahía Blanca; Argentina. Unesco; Argentina
Fil: Barrantes, Francisco Jose. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto de Investigaciones Bioquímicas de Bahía Blanca. Universidad Nacional del Sur. Instituto de Investigaciones Bioquímicas de Bahía Blanca; Argentina. Unesco; Argentina - Materia
-
Achr
Fluorescencia
Lipido - Nivel de accesibilidad
- acceso abierto
- Condiciones de uso
- https://creativecommons.org/licenses/by/2.5/ar/
- Repositorio
- Institución
- Consejo Nacional de Investigaciones Científicas y Técnicas
- OAI Identificador
- oai:ri.conicet.gov.ar:11336/44119
Ver los metadatos del registro completo
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oai:ri.conicet.gov.ar:11336/44119 |
network_acronym_str |
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repository_id_str |
3498 |
network_name_str |
CONICET Digital (CONICET) |
spelling |
Resolution of complex fluorescence spectra of lipids and nicotinic acetylcholine receptor by multivariate analysis reveals protein-mediated effects on the receptor's immediate lipid microenvironmentWenz, Jorge JavierBarrantes, Francisco JoseAchrFluorescenciaLipidohttps://purl.org/becyt/ford/1.6https://purl.org/becyt/ford/1Analysis of fluorescent spectra from comp lex biological systems containing various fluorescent probes with overlapping emissi on bands is a challenging task. Valuable information can be extracted from the full spectra, however, by using multivariate analysis (MA) of measurements at differen t wavelengths. We a pplied MA to spectral data of purified Torpedo nicotinic acetylcholine receptor (AChR) protein reconstituted into liposomes made up of diol eoylphosphatidic acid (DOPA) and dioleoylphosphatidylcholine (DOPC) doped with two ex trinsic fluorescent probes (NBD-cholesterol/pyrene-PC). Förster re sonance energy transfer (FRET) was observed between the protein and pyre ne-PC and between pyrene-PC and NBD- cholesterol, leading to overlapping emission bands. Partial least squares analysis was applied to fluorescence spectra of pyrene -PC in liposomes with different DOPC/DOPA ratios, generating a model that was tested by an internal validation (leave-one-out cross-validation) and was further used to predict the apparent lipid molar ratio in AChR-containing samples. The values predi cted for DOPA, the lipid with the highest Tm, indicate that the protein exerts a rigidi fying effect on its lipid microenvironment. A similar conclusion was reached from excime r formation of pyrene -PC, a collisional- dependent phenomenon. The excimer/monome r ratio (E/M) at different DOPC/DOPA molar ratios revealed the restricted diffusio n of the probe in AChR-containing samples in comparison to pure lipid samples devoid of protein. FRET from the AChR (donor) to pyrene-PC (acceptor) as a function of temperature was found to increase with increasing temperature, suggesting a shorte r distance between AChR and pyrene PC. Taken together, the results obtained by MA on complex spectra indicate that the AChR rigidifies its surrounding lipid and prefers DOPA rather than DOPC in its immediate microenvironment.Fil: Wenz, Jorge Javier. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto de Investigaciones Bioquímicas de Bahía Blanca. Universidad Nacional del Sur. Instituto de Investigaciones Bioquímicas de Bahía Blanca; Argentina. Unesco; ArgentinaFil: Barrantes, Francisco Jose. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto de Investigaciones Bioquímicas de Bahía Blanca. Universidad Nacional del Sur. Instituto de Investigaciones Bioquímicas de Bahía Blanca; Argentina. Unesco; ArgentinaSpringer2008-12info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/44119Wenz, Jorge Javier; Barrantes, Francisco Jose; Resolution of complex fluorescence spectra of lipids and nicotinic acetylcholine receptor by multivariate analysis reveals protein-mediated effects on the receptor's immediate lipid microenvironment; Springer; PMC Biophysics; 1; 1; 12-2008; 1-121757-5036CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://link.springer.com/article/10.1186/1757-5036-1-6info:eu-repo/semantics/altIdentifier/doi/10.1186/1757-5036-1-6info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T09:39:25Zoai:ri.conicet.gov.ar:11336/44119instacron: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 09:39:25.866CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse |
dc.title.none.fl_str_mv |
Resolution of complex fluorescence spectra of lipids and nicotinic acetylcholine receptor by multivariate analysis reveals protein-mediated effects on the receptor's immediate lipid microenvironment |
title |
Resolution of complex fluorescence spectra of lipids and nicotinic acetylcholine receptor by multivariate analysis reveals protein-mediated effects on the receptor's immediate lipid microenvironment |
spellingShingle |
Resolution of complex fluorescence spectra of lipids and nicotinic acetylcholine receptor by multivariate analysis reveals protein-mediated effects on the receptor's immediate lipid microenvironment Wenz, Jorge Javier Achr Fluorescencia Lipido |
title_short |
Resolution of complex fluorescence spectra of lipids and nicotinic acetylcholine receptor by multivariate analysis reveals protein-mediated effects on the receptor's immediate lipid microenvironment |
title_full |
Resolution of complex fluorescence spectra of lipids and nicotinic acetylcholine receptor by multivariate analysis reveals protein-mediated effects on the receptor's immediate lipid microenvironment |
title_fullStr |
Resolution of complex fluorescence spectra of lipids and nicotinic acetylcholine receptor by multivariate analysis reveals protein-mediated effects on the receptor's immediate lipid microenvironment |
title_full_unstemmed |
Resolution of complex fluorescence spectra of lipids and nicotinic acetylcholine receptor by multivariate analysis reveals protein-mediated effects on the receptor's immediate lipid microenvironment |
title_sort |
Resolution of complex fluorescence spectra of lipids and nicotinic acetylcholine receptor by multivariate analysis reveals protein-mediated effects on the receptor's immediate lipid microenvironment |
dc.creator.none.fl_str_mv |
Wenz, Jorge Javier Barrantes, Francisco Jose |
author |
Wenz, Jorge Javier |
author_facet |
Wenz, Jorge Javier Barrantes, Francisco Jose |
author_role |
author |
author2 |
Barrantes, Francisco Jose |
author2_role |
author |
dc.subject.none.fl_str_mv |
Achr Fluorescencia Lipido |
topic |
Achr Fluorescencia Lipido |
purl_subject.fl_str_mv |
https://purl.org/becyt/ford/1.6 https://purl.org/becyt/ford/1 |
dc.description.none.fl_txt_mv |
Analysis of fluorescent spectra from comp lex biological systems containing various fluorescent probes with overlapping emissi on bands is a challenging task. Valuable information can be extracted from the full spectra, however, by using multivariate analysis (MA) of measurements at differen t wavelengths. We a pplied MA to spectral data of purified Torpedo nicotinic acetylcholine receptor (AChR) protein reconstituted into liposomes made up of diol eoylphosphatidic acid (DOPA) and dioleoylphosphatidylcholine (DOPC) doped with two ex trinsic fluorescent probes (NBD-cholesterol/pyrene-PC). Förster re sonance energy transfer (FRET) was observed between the protein and pyre ne-PC and between pyrene-PC and NBD- cholesterol, leading to overlapping emission bands. Partial least squares analysis was applied to fluorescence spectra of pyrene -PC in liposomes with different DOPC/DOPA ratios, generating a model that was tested by an internal validation (leave-one-out cross-validation) and was further used to predict the apparent lipid molar ratio in AChR-containing samples. The values predi cted for DOPA, the lipid with the highest Tm, indicate that the protein exerts a rigidi fying effect on its lipid microenvironment. A similar conclusion was reached from excime r formation of pyrene -PC, a collisional- dependent phenomenon. The excimer/monome r ratio (E/M) at different DOPC/DOPA molar ratios revealed the restricted diffusio n of the probe in AChR-containing samples in comparison to pure lipid samples devoid of protein. FRET from the AChR (donor) to pyrene-PC (acceptor) as a function of temperature was found to increase with increasing temperature, suggesting a shorte r distance between AChR and pyrene PC. Taken together, the results obtained by MA on complex spectra indicate that the AChR rigidifies its surrounding lipid and prefers DOPA rather than DOPC in its immediate microenvironment. Fil: Wenz, Jorge Javier. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto de Investigaciones Bioquímicas de Bahía Blanca. Universidad Nacional del Sur. Instituto de Investigaciones Bioquímicas de Bahía Blanca; Argentina. Unesco; Argentina Fil: Barrantes, Francisco Jose. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto de Investigaciones Bioquímicas de Bahía Blanca. Universidad Nacional del Sur. Instituto de Investigaciones Bioquímicas de Bahía Blanca; Argentina. Unesco; Argentina |
description |
Analysis of fluorescent spectra from comp lex biological systems containing various fluorescent probes with overlapping emissi on bands is a challenging task. Valuable information can be extracted from the full spectra, however, by using multivariate analysis (MA) of measurements at differen t wavelengths. We a pplied MA to spectral data of purified Torpedo nicotinic acetylcholine receptor (AChR) protein reconstituted into liposomes made up of diol eoylphosphatidic acid (DOPA) and dioleoylphosphatidylcholine (DOPC) doped with two ex trinsic fluorescent probes (NBD-cholesterol/pyrene-PC). Förster re sonance energy transfer (FRET) was observed between the protein and pyre ne-PC and between pyrene-PC and NBD- cholesterol, leading to overlapping emission bands. Partial least squares analysis was applied to fluorescence spectra of pyrene -PC in liposomes with different DOPC/DOPA ratios, generating a model that was tested by an internal validation (leave-one-out cross-validation) and was further used to predict the apparent lipid molar ratio in AChR-containing samples. The values predi cted for DOPA, the lipid with the highest Tm, indicate that the protein exerts a rigidi fying effect on its lipid microenvironment. A similar conclusion was reached from excime r formation of pyrene -PC, a collisional- dependent phenomenon. The excimer/monome r ratio (E/M) at different DOPC/DOPA molar ratios revealed the restricted diffusio n of the probe in AChR-containing samples in comparison to pure lipid samples devoid of protein. FRET from the AChR (donor) to pyrene-PC (acceptor) as a function of temperature was found to increase with increasing temperature, suggesting a shorte r distance between AChR and pyrene PC. Taken together, the results obtained by MA on complex spectra indicate that the AChR rigidifies its surrounding lipid and prefers DOPA rather than DOPC in its immediate microenvironment. |
publishDate |
2008 |
dc.date.none.fl_str_mv |
2008-12 |
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/11336/44119 Wenz, Jorge Javier; Barrantes, Francisco Jose; Resolution of complex fluorescence spectra of lipids and nicotinic acetylcholine receptor by multivariate analysis reveals protein-mediated effects on the receptor's immediate lipid microenvironment; Springer; PMC Biophysics; 1; 1; 12-2008; 1-12 1757-5036 CONICET Digital CONICET |
url |
http://hdl.handle.net/11336/44119 |
identifier_str_mv |
Wenz, Jorge Javier; Barrantes, Francisco Jose; Resolution of complex fluorescence spectra of lipids and nicotinic acetylcholine receptor by multivariate analysis reveals protein-mediated effects on the receptor's immediate lipid microenvironment; Springer; PMC Biophysics; 1; 1; 12-2008; 1-12 1757-5036 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://link.springer.com/article/10.1186/1757-5036-1-6 info:eu-repo/semantics/altIdentifier/doi/10.1186/1757-5036-1-6 |
dc.rights.none.fl_str_mv |
info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by/2.5/ar/ |
eu_rights_str_mv |
openAccess |
rights_invalid_str_mv |
https://creativecommons.org/licenses/by/2.5/ar/ |
dc.format.none.fl_str_mv |
application/pdf application/pdf application/pdf |
dc.publisher.none.fl_str_mv |
Springer |
publisher.none.fl_str_mv |
Springer |
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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1844613247169200128 |
score |
13.070432 |