Urea-induced unfolding of Glossoscolex paulistus hemoglobin, in oxy- and cyanomet-forms: A dissociation model
Autor(a) principal: | |
---|---|
Data de Publicação: | 2013 |
Outros Autores: | , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://dx.doi.org/10.1016/j.ijbiomac.2012.09.023 http://hdl.handle.net/11449/74173 |
Resumo: | The urea effect on the giant extracellular hemoglobin of Glossoscolex paulistus (HbGp) stability was studied by analytical ultracentrifugation (AUC) and small angle X-ray scattering (SAXS). AUC data show that the sedimentation coefficient distributions curves c (S), at 1.0mol/L of urea, display a single peak at 57 S, associated to the undissociated protein. The increase in urea concentration, up to 4.0mol/L, induces the appearance of smaller species, due to oligomeric dissociation. The sedimentation coefficients and molecular masses are 9.2S and 204kDa for the dodecamer (abcd)3, 5.5S and 69kDa for the tetramer (abcd), 4.1S and 52kDa for the trimer (abc) and 2.0 S and 17kDa for the monomer d, respectively. SAXS data show initially a decrease in the I(0) values due to the oligomeric dissociation, and then, above 4.0mol/L of denaturant, for oxy-HbGp, and above 6.0mol/L for cyanomet-HbGp, an increase in the maximum dimension and gyration radius is observed, due to the unfolding process. According to AUC and SAXS data the HbGp unfolding is described by two phases: the first one, at low urea concentration, below 4.0mol/L, characterizes the oligomeric dissociation, while the second one, at higher urea concentration, is associated to the unfolding of dissociated species. Our results are complementary to a recent report based on spectroscopic observations. © 2012 Elsevier B.V. |
id |
UNSP_9d51197c806fff0f8ee9064458e28ab9 |
---|---|
oai_identifier_str |
oai:repositorio.unesp.br:11449/74173 |
network_acronym_str |
UNSP |
network_name_str |
Repositório Institucional da UNESP |
repository_id_str |
2946 |
spelling |
Urea-induced unfolding of Glossoscolex paulistus hemoglobin, in oxy- and cyanomet-forms: A dissociation modelAUCExtracellular hemoglobinHbGpOligomeric dissociationSAXSUreacyanomethemoglobinhemoglobinoxyhemoglobinunclassified drugureaannelidconcentration responsedissociationGlossoscolex paulistusmolecular weightnonhumanoligomeric dissociationprotein stabilityprotein structureprotein unfoldingsedimentationultracentrifugationX ray crystallographyAnimalsHemoglobinsModels, ChemicalOligochaetaProtein FoldingGlossoscolexThe urea effect on the giant extracellular hemoglobin of Glossoscolex paulistus (HbGp) stability was studied by analytical ultracentrifugation (AUC) and small angle X-ray scattering (SAXS). AUC data show that the sedimentation coefficient distributions curves c (S), at 1.0mol/L of urea, display a single peak at 57 S, associated to the undissociated protein. The increase in urea concentration, up to 4.0mol/L, induces the appearance of smaller species, due to oligomeric dissociation. The sedimentation coefficients and molecular masses are 9.2S and 204kDa for the dodecamer (abcd)3, 5.5S and 69kDa for the tetramer (abcd), 4.1S and 52kDa for the trimer (abc) and 2.0 S and 17kDa for the monomer d, respectively. SAXS data show initially a decrease in the I(0) values due to the oligomeric dissociation, and then, above 4.0mol/L of denaturant, for oxy-HbGp, and above 6.0mol/L for cyanomet-HbGp, an increase in the maximum dimension and gyration radius is observed, due to the unfolding process. According to AUC and SAXS data the HbGp unfolding is described by two phases: the first one, at low urea concentration, below 4.0mol/L, characterizes the oligomeric dissociation, while the second one, at higher urea concentration, is associated to the unfolding of dissociated species. Our results are complementary to a recent report based on spectroscopic observations. © 2012 Elsevier B.V.Instituto de Química de São Carlos Universidade de São Paulo, SPUniversidade Estadual Paulista Julio de Mesquita Filho Registro, São Paulo, SPUniversidade Estadual Paulista Julio de Mesquita Filho Registro, São Paulo, SPUniversidade de São Paulo (USP)Universidade Estadual Paulista (Unesp)Carvalho, Francisco A.O.Carvalho, José Wilson P.Santiago, Patrícia S. [UNESP]Tabak, Marcel2014-05-27T11:27:28Z2014-05-27T11:27:28Z2013-01-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article340-348application/pdfhttp://dx.doi.org/10.1016/j.ijbiomac.2012.09.023International Journal of Biological Macromolecules, v. 52, n. 1, p. 340-348, 2013.0141-81301879-0003http://hdl.handle.net/11449/7417310.1016/j.ijbiomac.2012.09.023WOS:0003139343000502-s2.0-848694105882-s2.0-84869410588.pdf67053670106620870000-0002-6205-9441Scopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengInternational Journal of Biological Macromolecules3.9090,917info:eu-repo/semantics/openAccess2024-05-03T13:20:20Zoai:repositorio.unesp.br:11449/74173Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T20:21:54.199369Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Urea-induced unfolding of Glossoscolex paulistus hemoglobin, in oxy- and cyanomet-forms: A dissociation model |
title |
Urea-induced unfolding of Glossoscolex paulistus hemoglobin, in oxy- and cyanomet-forms: A dissociation model |
spellingShingle |
Urea-induced unfolding of Glossoscolex paulistus hemoglobin, in oxy- and cyanomet-forms: A dissociation model Carvalho, Francisco A.O. AUC Extracellular hemoglobin HbGp Oligomeric dissociation SAXS Urea cyanomethemoglobin hemoglobin oxyhemoglobin unclassified drug urea annelid concentration response dissociation Glossoscolex paulistus molecular weight nonhuman oligomeric dissociation protein stability protein structure protein unfolding sedimentation ultracentrifugation X ray crystallography Animals Hemoglobins Models, Chemical Oligochaeta Protein Folding Glossoscolex |
title_short |
Urea-induced unfolding of Glossoscolex paulistus hemoglobin, in oxy- and cyanomet-forms: A dissociation model |
title_full |
Urea-induced unfolding of Glossoscolex paulistus hemoglobin, in oxy- and cyanomet-forms: A dissociation model |
title_fullStr |
Urea-induced unfolding of Glossoscolex paulistus hemoglobin, in oxy- and cyanomet-forms: A dissociation model |
title_full_unstemmed |
Urea-induced unfolding of Glossoscolex paulistus hemoglobin, in oxy- and cyanomet-forms: A dissociation model |
title_sort |
Urea-induced unfolding of Glossoscolex paulistus hemoglobin, in oxy- and cyanomet-forms: A dissociation model |
author |
Carvalho, Francisco A.O. |
author_facet |
Carvalho, Francisco A.O. Carvalho, José Wilson P. Santiago, Patrícia S. [UNESP] Tabak, Marcel |
author_role |
author |
author2 |
Carvalho, José Wilson P. Santiago, Patrícia S. [UNESP] Tabak, Marcel |
author2_role |
author author author |
dc.contributor.none.fl_str_mv |
Universidade de São Paulo (USP) Universidade Estadual Paulista (Unesp) |
dc.contributor.author.fl_str_mv |
Carvalho, Francisco A.O. Carvalho, José Wilson P. Santiago, Patrícia S. [UNESP] Tabak, Marcel |
dc.subject.por.fl_str_mv |
AUC Extracellular hemoglobin HbGp Oligomeric dissociation SAXS Urea cyanomethemoglobin hemoglobin oxyhemoglobin unclassified drug urea annelid concentration response dissociation Glossoscolex paulistus molecular weight nonhuman oligomeric dissociation protein stability protein structure protein unfolding sedimentation ultracentrifugation X ray crystallography Animals Hemoglobins Models, Chemical Oligochaeta Protein Folding Glossoscolex |
topic |
AUC Extracellular hemoglobin HbGp Oligomeric dissociation SAXS Urea cyanomethemoglobin hemoglobin oxyhemoglobin unclassified drug urea annelid concentration response dissociation Glossoscolex paulistus molecular weight nonhuman oligomeric dissociation protein stability protein structure protein unfolding sedimentation ultracentrifugation X ray crystallography Animals Hemoglobins Models, Chemical Oligochaeta Protein Folding Glossoscolex |
description |
The urea effect on the giant extracellular hemoglobin of Glossoscolex paulistus (HbGp) stability was studied by analytical ultracentrifugation (AUC) and small angle X-ray scattering (SAXS). AUC data show that the sedimentation coefficient distributions curves c (S), at 1.0mol/L of urea, display a single peak at 57 S, associated to the undissociated protein. The increase in urea concentration, up to 4.0mol/L, induces the appearance of smaller species, due to oligomeric dissociation. The sedimentation coefficients and molecular masses are 9.2S and 204kDa for the dodecamer (abcd)3, 5.5S and 69kDa for the tetramer (abcd), 4.1S and 52kDa for the trimer (abc) and 2.0 S and 17kDa for the monomer d, respectively. SAXS data show initially a decrease in the I(0) values due to the oligomeric dissociation, and then, above 4.0mol/L of denaturant, for oxy-HbGp, and above 6.0mol/L for cyanomet-HbGp, an increase in the maximum dimension and gyration radius is observed, due to the unfolding process. According to AUC and SAXS data the HbGp unfolding is described by two phases: the first one, at low urea concentration, below 4.0mol/L, characterizes the oligomeric dissociation, while the second one, at higher urea concentration, is associated to the unfolding of dissociated species. Our results are complementary to a recent report based on spectroscopic observations. © 2012 Elsevier B.V. |
publishDate |
2013 |
dc.date.none.fl_str_mv |
2013-01-01 2014-05-27T11:27:28Z 2014-05-27T11:27:28Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://dx.doi.org/10.1016/j.ijbiomac.2012.09.023 International Journal of Biological Macromolecules, v. 52, n. 1, p. 340-348, 2013. 0141-8130 1879-0003 http://hdl.handle.net/11449/74173 10.1016/j.ijbiomac.2012.09.023 WOS:000313934300050 2-s2.0-84869410588 2-s2.0-84869410588.pdf 6705367010662087 0000-0002-6205-9441 |
url |
http://dx.doi.org/10.1016/j.ijbiomac.2012.09.023 http://hdl.handle.net/11449/74173 |
identifier_str_mv |
International Journal of Biological Macromolecules, v. 52, n. 1, p. 340-348, 2013. 0141-8130 1879-0003 10.1016/j.ijbiomac.2012.09.023 WOS:000313934300050 2-s2.0-84869410588 2-s2.0-84869410588.pdf 6705367010662087 0000-0002-6205-9441 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
International Journal of Biological Macromolecules 3.909 0,917 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
340-348 application/pdf |
dc.source.none.fl_str_mv |
Scopus reponame:Repositório Institucional da UNESP instname:Universidade Estadual Paulista (UNESP) instacron:UNESP |
instname_str |
Universidade Estadual Paulista (UNESP) |
instacron_str |
UNESP |
institution |
UNESP |
reponame_str |
Repositório Institucional da UNESP |
collection |
Repositório Institucional da UNESP |
repository.name.fl_str_mv |
Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP) |
repository.mail.fl_str_mv |
|
_version_ |
1808129193479766016 |