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
- Institución
- Consejo Nacional de Investigaciones Científicas y Técnicas
- OAI Identificador
- oai:ri.conicet.gov.ar:11336/72014
Ver los metadatos del registro completo
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 |
_version_ |
1844613836137562112 |
score |
13.070432 |