Sulfide binding properties of truncated hemoglobins

Autores
Nicoletti, Francesco P.; Comandini, Alessandra; Bonamore, Alessandra; Boechi, Leonardo; Boubeta, Fernando Martín; Feis, Alessandro; Smulevich, Iulietta; Boffi, Alberto
Año de publicación
2010
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
The truncated hemoglobins from Bacillus subtilis (Bs-trHb) and Thermobifida fusca (Tf-trHb) have been shown to form high-affinity complexes with hydrogen sulfide in their ferric state. The recombinant proteins, as extracted, from Escherichia coli cells after overexpression, are indeed partially saturated with sulfide, and even highly purified samples still contain a small but significant amount of iron-bound sulfide. Thus, a complete thermodynamic and kinetic study has been undertaken by means of equilibrium and kinetic displacement experiments to assess the relevant sulfide binding parameters. The body of experimental data indicates that both proteins possess a high, affinity for hydrogen sulfide (K= 5.0 × 106 and 28 × 106 M-1 for Bs-trHb and Tf-trHb, respectively, at pH 7.0), though, lower with, respect to that reported previously for the sulfide avid Lucina pectinata I hemoglobins (2.9 × 108 M-1). From the kinetic point of view, the overall high affinity resides in the slow rate of sulfide release, attributed to hydrogen bonding stabilization of the bound ligand by distal residue WG8. A set of point mutants in which these residues have been replaced with Phe indicates that the WG8 residue represents the major kinetic barrier to the escape of the bound sulfide species. Accordingly, classical molecular dynamics simulations of SH.....-bound ferric Tf-trHb show that WG8 plays a key role in the stabilization of coordinated SH -whereas the YCD1 and. YB10 contributions are negligible. Interestingly, the triple Tf-trHb mutant bearing only Phe residues in the relevant B10, G8, and CD1 positions is endowed with a higher overall affinity for sulfide characterized, by a very fast second-order rate constant and 2 order of magnitude faster kinetics of sulfide release with respect to the wild-type protein. Resonance Raman spectroscopy data indicate that the sulfide adducts are typical of a ferric iron, low-spin derivative. In analogy with other low-spin ferric sulfide adducts, the strong band at 375 cm-1 is tentatively assigned to a Fe-S stretching band. The high affinity for hydrogen, sulfide is thought to have a possible physiological significance as H2S is produced in bacteria at metabolic steps involved in cysteine biosynthesis and hence in thiol redox homeostasis. © 2010 American Chemical Society.
Fil: Nicoletti, Francesco P.. Università degli Studi di Firenze; Italia
Fil: Comandini, Alessandra. Università degli studi di Roma "La Sapienza"; Italia
Fil: Bonamore, Alessandra. Università degli studi di Roma "La Sapienza"; Italia
Fil: Boechi, Leonardo. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Química, Física de los Materiales, Medioambiente y Energía. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Química, Física de los Materiales, Medioambiente y Energía; Argentina. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Química Inorgánica, Analítica y Química Física; Argentina
Fil: Boubeta, Fernando Martín. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Química, Física de los Materiales, Medioambiente y Energía. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Química, Física de los Materiales, Medioambiente y Energía; Argentina. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Química Inorgánica, Analítica y Química Física; Argentina
Fil: Feis, Alessandro. Università degli Studi di Firenze; Italia
Fil: Smulevich, Iulietta. Università degli Studi di Firenze; Italia
Fil: Boffi, Alberto. Università degli studi di Roma "La Sapienza"; Italia
Materia
Sulfide-Binding
Simulation
Truncated-Hemoglobin
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:11336/72014

id CONICETDig_86f7e99ee39c8372b974e522072a0bed
oai_identifier_str oai:ri.conicet.gov.ar:11336/72014
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Sulfide binding properties of truncated hemoglobinsNicoletti, Francesco P.Comandini, AlessandraBonamore, AlessandraBoechi, LeonardoBoubeta, Fernando MartínFeis, AlessandroSmulevich, IuliettaBoffi, AlbertoSulfide-BindingSimulationTruncated-Hemoglobinhttps://purl.org/becyt/ford/1.4https://purl.org/becyt/ford/1The truncated hemoglobins from Bacillus subtilis (Bs-trHb) and Thermobifida fusca (Tf-trHb) have been shown to form high-affinity complexes with hydrogen sulfide in their ferric state. The recombinant proteins, as extracted, from Escherichia coli cells after overexpression, are indeed partially saturated with sulfide, and even highly purified samples still contain a small but significant amount of iron-bound sulfide. Thus, a complete thermodynamic and kinetic study has been undertaken by means of equilibrium and kinetic displacement experiments to assess the relevant sulfide binding parameters. The body of experimental data indicates that both proteins possess a high, affinity for hydrogen sulfide (K= 5.0 × 106 and 28 × 106 M-1 for Bs-trHb and Tf-trHb, respectively, at pH 7.0), though, lower with, respect to that reported previously for the sulfide avid Lucina pectinata I hemoglobins (2.9 × 108 M-1). From the kinetic point of view, the overall high affinity resides in the slow rate of sulfide release, attributed to hydrogen bonding stabilization of the bound ligand by distal residue WG8. A set of point mutants in which these residues have been replaced with Phe indicates that the WG8 residue represents the major kinetic barrier to the escape of the bound sulfide species. Accordingly, classical molecular dynamics simulations of SH.....-bound ferric Tf-trHb show that WG8 plays a key role in the stabilization of coordinated SH -whereas the YCD1 and. YB10 contributions are negligible. Interestingly, the triple Tf-trHb mutant bearing only Phe residues in the relevant B10, G8, and CD1 positions is endowed with a higher overall affinity for sulfide characterized, by a very fast second-order rate constant and 2 order of magnitude faster kinetics of sulfide release with respect to the wild-type protein. Resonance Raman spectroscopy data indicate that the sulfide adducts are typical of a ferric iron, low-spin derivative. In analogy with other low-spin ferric sulfide adducts, the strong band at 375 cm-1 is tentatively assigned to a Fe-S stretching band. The high affinity for hydrogen, sulfide is thought to have a possible physiological significance as H2S is produced in bacteria at metabolic steps involved in cysteine biosynthesis and hence in thiol redox homeostasis. © 2010 American Chemical Society.Fil: Nicoletti, Francesco P.. Università degli Studi di Firenze; ItaliaFil: Comandini, Alessandra. Università degli studi di Roma "La Sapienza"; ItaliaFil: Bonamore, Alessandra. Università degli studi di Roma "La Sapienza"; ItaliaFil: Boechi, Leonardo. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Química, Física de los Materiales, Medioambiente y Energía. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Química, Física de los Materiales, Medioambiente y Energía; Argentina. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Química Inorgánica, Analítica y Química Física; ArgentinaFil: Boubeta, Fernando Martín. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Química, Física de los Materiales, Medioambiente y Energía. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Química, Física de los Materiales, Medioambiente y Energía; Argentina. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Química Inorgánica, Analítica y Química Física; ArgentinaFil: Feis, Alessandro. Università degli Studi di Firenze; ItaliaFil: Smulevich, Iulietta. Università degli Studi di Firenze; ItaliaFil: Boffi, Alberto. Università degli studi di Roma "La Sapienza"; ItaliaAmerican Chemical Society2010-03info: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/11336/72014Nicoletti, Francesco P.; Comandini, Alessandra; Bonamore, Alessandra; Boechi, Leonardo; Boubeta, Fernando Martín; et al.; Sulfide binding properties of truncated hemoglobins; American Chemical Society; Biochemistry; 49; 10; 3-2010; 2269-22780006-2960CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.1021/bi901671dinfo:eu-repo/semantics/altIdentifier/url/https://pubs.acs.org/doi/10.1021/bi901671dinfo:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T10:02:46Zoai:ri.conicet.gov.ar:11336/72014instacron: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 10:02:47.163CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Sulfide binding properties of truncated hemoglobins
title Sulfide binding properties of truncated hemoglobins
spellingShingle Sulfide binding properties of truncated hemoglobins
Nicoletti, Francesco P.
Sulfide-Binding
Simulation
Truncated-Hemoglobin
title_short Sulfide binding properties of truncated hemoglobins
title_full Sulfide binding properties of truncated hemoglobins
title_fullStr Sulfide binding properties of truncated hemoglobins
title_full_unstemmed Sulfide binding properties of truncated hemoglobins
title_sort Sulfide binding properties of truncated hemoglobins
dc.creator.none.fl_str_mv Nicoletti, Francesco P.
Comandini, Alessandra
Bonamore, Alessandra
Boechi, Leonardo
Boubeta, Fernando Martín
Feis, Alessandro
Smulevich, Iulietta
Boffi, Alberto
author Nicoletti, Francesco P.
author_facet Nicoletti, Francesco P.
Comandini, Alessandra
Bonamore, Alessandra
Boechi, Leonardo
Boubeta, Fernando Martín
Feis, Alessandro
Smulevich, Iulietta
Boffi, Alberto
author_role author
author2 Comandini, Alessandra
Bonamore, Alessandra
Boechi, Leonardo
Boubeta, Fernando Martín
Feis, Alessandro
Smulevich, Iulietta
Boffi, Alberto
author2_role author
author
author
author
author
author
author
dc.subject.none.fl_str_mv Sulfide-Binding
Simulation
Truncated-Hemoglobin
topic Sulfide-Binding
Simulation
Truncated-Hemoglobin
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.4
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv The truncated hemoglobins from Bacillus subtilis (Bs-trHb) and Thermobifida fusca (Tf-trHb) have been shown to form high-affinity complexes with hydrogen sulfide in their ferric state. The recombinant proteins, as extracted, from Escherichia coli cells after overexpression, are indeed partially saturated with sulfide, and even highly purified samples still contain a small but significant amount of iron-bound sulfide. Thus, a complete thermodynamic and kinetic study has been undertaken by means of equilibrium and kinetic displacement experiments to assess the relevant sulfide binding parameters. The body of experimental data indicates that both proteins possess a high, affinity for hydrogen sulfide (K= 5.0 × 106 and 28 × 106 M-1 for Bs-trHb and Tf-trHb, respectively, at pH 7.0), though, lower with, respect to that reported previously for the sulfide avid Lucina pectinata I hemoglobins (2.9 × 108 M-1). From the kinetic point of view, the overall high affinity resides in the slow rate of sulfide release, attributed to hydrogen bonding stabilization of the bound ligand by distal residue WG8. A set of point mutants in which these residues have been replaced with Phe indicates that the WG8 residue represents the major kinetic barrier to the escape of the bound sulfide species. Accordingly, classical molecular dynamics simulations of SH.....-bound ferric Tf-trHb show that WG8 plays a key role in the stabilization of coordinated SH -whereas the YCD1 and. YB10 contributions are negligible. Interestingly, the triple Tf-trHb mutant bearing only Phe residues in the relevant B10, G8, and CD1 positions is endowed with a higher overall affinity for sulfide characterized, by a very fast second-order rate constant and 2 order of magnitude faster kinetics of sulfide release with respect to the wild-type protein. Resonance Raman spectroscopy data indicate that the sulfide adducts are typical of a ferric iron, low-spin derivative. In analogy with other low-spin ferric sulfide adducts, the strong band at 375 cm-1 is tentatively assigned to a Fe-S stretching band. The high affinity for hydrogen, sulfide is thought to have a possible physiological significance as H2S is produced in bacteria at metabolic steps involved in cysteine biosynthesis and hence in thiol redox homeostasis. © 2010 American Chemical Society.
Fil: Nicoletti, Francesco P.. Università degli Studi di Firenze; Italia
Fil: Comandini, Alessandra. Università degli studi di Roma "La Sapienza"; Italia
Fil: Bonamore, Alessandra. Università degli studi di Roma "La Sapienza"; Italia
Fil: Boechi, Leonardo. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Química, Física de los Materiales, Medioambiente y Energía. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Química, Física de los Materiales, Medioambiente y Energía; Argentina. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Química Inorgánica, Analítica y Química Física; Argentina
Fil: Boubeta, Fernando Martín. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Química, Física de los Materiales, Medioambiente y Energía. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Química, Física de los Materiales, Medioambiente y Energía; Argentina. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Química Inorgánica, Analítica y Química Física; Argentina
Fil: Feis, Alessandro. Università degli Studi di Firenze; Italia
Fil: Smulevich, Iulietta. Università degli Studi di Firenze; Italia
Fil: Boffi, Alberto. Università degli studi di Roma "La Sapienza"; Italia
description The truncated hemoglobins from Bacillus subtilis (Bs-trHb) and Thermobifida fusca (Tf-trHb) have been shown to form high-affinity complexes with hydrogen sulfide in their ferric state. The recombinant proteins, as extracted, from Escherichia coli cells after overexpression, are indeed partially saturated with sulfide, and even highly purified samples still contain a small but significant amount of iron-bound sulfide. Thus, a complete thermodynamic and kinetic study has been undertaken by means of equilibrium and kinetic displacement experiments to assess the relevant sulfide binding parameters. The body of experimental data indicates that both proteins possess a high, affinity for hydrogen sulfide (K= 5.0 × 106 and 28 × 106 M-1 for Bs-trHb and Tf-trHb, respectively, at pH 7.0), though, lower with, respect to that reported previously for the sulfide avid Lucina pectinata I hemoglobins (2.9 × 108 M-1). From the kinetic point of view, the overall high affinity resides in the slow rate of sulfide release, attributed to hydrogen bonding stabilization of the bound ligand by distal residue WG8. A set of point mutants in which these residues have been replaced with Phe indicates that the WG8 residue represents the major kinetic barrier to the escape of the bound sulfide species. Accordingly, classical molecular dynamics simulations of SH.....-bound ferric Tf-trHb show that WG8 plays a key role in the stabilization of coordinated SH -whereas the YCD1 and. YB10 contributions are negligible. Interestingly, the triple Tf-trHb mutant bearing only Phe residues in the relevant B10, G8, and CD1 positions is endowed with a higher overall affinity for sulfide characterized, by a very fast second-order rate constant and 2 order of magnitude faster kinetics of sulfide release with respect to the wild-type protein. Resonance Raman spectroscopy data indicate that the sulfide adducts are typical of a ferric iron, low-spin derivative. In analogy with other low-spin ferric sulfide adducts, the strong band at 375 cm-1 is tentatively assigned to a Fe-S stretching band. The high affinity for hydrogen, sulfide is thought to have a possible physiological significance as H2S is produced in bacteria at metabolic steps involved in cysteine biosynthesis and hence in thiol redox homeostasis. © 2010 American Chemical Society.
publishDate 2010
dc.date.none.fl_str_mv 2010-03
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/11336/72014
Nicoletti, Francesco P.; Comandini, Alessandra; Bonamore, Alessandra; Boechi, Leonardo; Boubeta, Fernando Martín; et al.; Sulfide binding properties of truncated hemoglobins; American Chemical Society; Biochemistry; 49; 10; 3-2010; 2269-2278
0006-2960
CONICET Digital
CONICET
url http://hdl.handle.net/11336/72014
identifier_str_mv Nicoletti, Francesco P.; Comandini, Alessandra; Bonamore, Alessandra; Boechi, Leonardo; Boubeta, Fernando Martín; et al.; Sulfide binding properties of truncated hemoglobins; American Chemical Society; Biochemistry; 49; 10; 3-2010; 2269-2278
0006-2960
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/doi/10.1021/bi901671d
info:eu-repo/semantics/altIdentifier/url/https://pubs.acs.org/doi/10.1021/bi901671d
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
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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