Role of PheE15 Gate in Ligand Entry and Nitric Oxide Detoxification Function of Mycobacterium tuberculosis Truncated Hemoglobin N

Autores
Oliveira, A.; Singh, S.; Bidon-Chanal, A.; Forti, F.; Martí, M.A.; Boechi, L.; Estrin, D.A.; Dikshit, K.L.; Luque, F.J.
Año de publicación
2012
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
The truncated hemoglobin N, HbN, of Mycobacterium tuberculosis is endowed with a potent nitric oxide dioxygenase (NOD) activity that allows it to relieve nitrosative stress and enhance in vivo survival of its host. Despite its small size, the protein matrix of HbN hosts a two-branched tunnel, consisting of orthogonal short and long channels, that connects the heme active site to the protein surface. A novel dual-path mechanism has been suggested to drive migration of O 2 and NO to the distal heme cavity. While oxygen migrates mainly by the short path, a ligand-induced conformational change regulates opening of the long tunnel branch for NO, via a phenylalanine (PheE15) residue that acts as a gate. Site-directed mutagenesis and molecular simulations have been used to examine the gating role played by PheE15 in modulating the NOD function of HbN. Mutants carrying replacement of PheE15 with alanine, isoleucine, tyrosine and tryptophan have similar O 2 /CO association kinetics, but display significant reduction in their NOD function. Molecular simulations substantiated that mutation at the PheE15 gate confers significant changes in the long tunnel, and therefore may affect the migration of ligands. These results support the pivotal role of PheE15 gate in modulating the diffusion of NO via the long tunnel branch in the oxygenated protein, and hence the NOD function of HbN. © 2012 Oliveira et al.
Fil:Martí, M.A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina.
Fil:Boechi, L. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina.
Fil:Estrin, D.A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina.
Fuente
PLoS ONE 2012;7(11)
Materia
alanine
dioxygenase
heme
isoleucine
nitric oxide dioxygenase
oxygen
phenylalanine
phenylalanine 15
truncated hemoglobin
truncated hemoglobin N
tryptophan
tyrosine
unclassified drug
article
conformational transition
controlled study
detoxification
down regulation
enzyme activity
ligand binding
molecular dynamics
mutant
mutational analysis
Mycobacterium tuberculosis
nonhuman
oxidation
oxygen affinity
site directed mutagenesis
structure analysis
wild type
Bacterial Proteins
Binding Sites
Carbon Monoxide
Computer Simulation
Crystallography, X-Ray
Ligands
Mutagenesis, Site-Directed
Mycobacterium tuberculosis
Nitric Oxide
Oxygen
Phenylalanine
Protein Structure, Tertiary
Truncated Hemoglobins
Mycobacterium tuberculosis
Nivel de accesibilidad
acceso abierto
Condiciones de uso
http://creativecommons.org/licenses/by/2.5/ar
Repositorio
Biblioteca Digital (UBA-FCEN)
Institución
Universidad Nacional de Buenos Aires. Facultad de Ciencias Exactas y Naturales
OAI Identificador
paperaa:paper_19326203_v7_n11_p_Oliveira

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oai_identifier_str paperaa:paper_19326203_v7_n11_p_Oliveira
network_acronym_str BDUBAFCEN
repository_id_str 1896
network_name_str Biblioteca Digital (UBA-FCEN)
spelling Role of PheE15 Gate in Ligand Entry and Nitric Oxide Detoxification Function of Mycobacterium tuberculosis Truncated Hemoglobin NOliveira, A.Singh, S.Bidon-Chanal, A.Forti, F.Martí, M.A.Boechi, L.Estrin, D.A.Dikshit, K.L.Luque, F.J.alaninedioxygenasehemeisoleucinenitric oxide dioxygenaseoxygenphenylalaninephenylalanine 15truncated hemoglobintruncated hemoglobin Ntryptophantyrosineunclassified drugarticleconformational transitioncontrolled studydetoxificationdown regulationenzyme activityligand bindingmolecular dynamicsmutantmutational analysisMycobacterium tuberculosisnonhumanoxidationoxygen affinitysite directed mutagenesisstructure analysiswild typeBacterial ProteinsBinding SitesCarbon MonoxideComputer SimulationCrystallography, X-RayLigandsMutagenesis, Site-DirectedMycobacterium tuberculosisNitric OxideOxygenPhenylalanineProtein Structure, TertiaryTruncated HemoglobinsMycobacterium tuberculosisThe truncated hemoglobin N, HbN, of Mycobacterium tuberculosis is endowed with a potent nitric oxide dioxygenase (NOD) activity that allows it to relieve nitrosative stress and enhance in vivo survival of its host. Despite its small size, the protein matrix of HbN hosts a two-branched tunnel, consisting of orthogonal short and long channels, that connects the heme active site to the protein surface. A novel dual-path mechanism has been suggested to drive migration of O 2 and NO to the distal heme cavity. While oxygen migrates mainly by the short path, a ligand-induced conformational change regulates opening of the long tunnel branch for NO, via a phenylalanine (PheE15) residue that acts as a gate. Site-directed mutagenesis and molecular simulations have been used to examine the gating role played by PheE15 in modulating the NOD function of HbN. Mutants carrying replacement of PheE15 with alanine, isoleucine, tyrosine and tryptophan have similar O 2 /CO association kinetics, but display significant reduction in their NOD function. Molecular simulations substantiated that mutation at the PheE15 gate confers significant changes in the long tunnel, and therefore may affect the migration of ligands. These results support the pivotal role of PheE15 gate in modulating the diffusion of NO via the long tunnel branch in the oxygenated protein, and hence the NOD function of HbN. © 2012 Oliveira et al.Fil:Martí, M.A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina.Fil:Boechi, L. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina.Fil:Estrin, D.A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina.2012info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfhttp://hdl.handle.net/20.500.12110/paper_19326203_v7_n11_p_OliveiraPLoS ONE 2012;7(11)reponame:Biblioteca Digital (UBA-FCEN)instname:Universidad Nacional de Buenos Aires. Facultad de Ciencias Exactas y Naturalesinstacron:UBA-FCENenginfo:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by/2.5/ar2025-09-29T13:43:00Zpaperaa:paper_19326203_v7_n11_p_OliveiraInstitucionalhttps://digital.bl.fcen.uba.ar/Universidad públicaNo correspondehttps://digital.bl.fcen.uba.ar/cgi-bin/oaiserver.cgiana@bl.fcen.uba.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:18962025-09-29 13:43:01.629Biblioteca Digital (UBA-FCEN) - Universidad Nacional de Buenos Aires. Facultad de Ciencias Exactas y Naturalesfalse
dc.title.none.fl_str_mv Role of PheE15 Gate in Ligand Entry and Nitric Oxide Detoxification Function of Mycobacterium tuberculosis Truncated Hemoglobin N
title Role of PheE15 Gate in Ligand Entry and Nitric Oxide Detoxification Function of Mycobacterium tuberculosis Truncated Hemoglobin N
spellingShingle Role of PheE15 Gate in Ligand Entry and Nitric Oxide Detoxification Function of Mycobacterium tuberculosis Truncated Hemoglobin N
Oliveira, A.
alanine
dioxygenase
heme
isoleucine
nitric oxide dioxygenase
oxygen
phenylalanine
phenylalanine 15
truncated hemoglobin
truncated hemoglobin N
tryptophan
tyrosine
unclassified drug
article
conformational transition
controlled study
detoxification
down regulation
enzyme activity
ligand binding
molecular dynamics
mutant
mutational analysis
Mycobacterium tuberculosis
nonhuman
oxidation
oxygen affinity
site directed mutagenesis
structure analysis
wild type
Bacterial Proteins
Binding Sites
Carbon Monoxide
Computer Simulation
Crystallography, X-Ray
Ligands
Mutagenesis, Site-Directed
Mycobacterium tuberculosis
Nitric Oxide
Oxygen
Phenylalanine
Protein Structure, Tertiary
Truncated Hemoglobins
Mycobacterium tuberculosis
title_short Role of PheE15 Gate in Ligand Entry and Nitric Oxide Detoxification Function of Mycobacterium tuberculosis Truncated Hemoglobin N
title_full Role of PheE15 Gate in Ligand Entry and Nitric Oxide Detoxification Function of Mycobacterium tuberculosis Truncated Hemoglobin N
title_fullStr Role of PheE15 Gate in Ligand Entry and Nitric Oxide Detoxification Function of Mycobacterium tuberculosis Truncated Hemoglobin N
title_full_unstemmed Role of PheE15 Gate in Ligand Entry and Nitric Oxide Detoxification Function of Mycobacterium tuberculosis Truncated Hemoglobin N
title_sort Role of PheE15 Gate in Ligand Entry and Nitric Oxide Detoxification Function of Mycobacterium tuberculosis Truncated Hemoglobin N
dc.creator.none.fl_str_mv Oliveira, A.
Singh, S.
Bidon-Chanal, A.
Forti, F.
Martí, M.A.
Boechi, L.
Estrin, D.A.
Dikshit, K.L.
Luque, F.J.
author Oliveira, A.
author_facet Oliveira, A.
Singh, S.
Bidon-Chanal, A.
Forti, F.
Martí, M.A.
Boechi, L.
Estrin, D.A.
Dikshit, K.L.
Luque, F.J.
author_role author
author2 Singh, S.
Bidon-Chanal, A.
Forti, F.
Martí, M.A.
Boechi, L.
Estrin, D.A.
Dikshit, K.L.
Luque, F.J.
author2_role author
author
author
author
author
author
author
author
dc.subject.none.fl_str_mv alanine
dioxygenase
heme
isoleucine
nitric oxide dioxygenase
oxygen
phenylalanine
phenylalanine 15
truncated hemoglobin
truncated hemoglobin N
tryptophan
tyrosine
unclassified drug
article
conformational transition
controlled study
detoxification
down regulation
enzyme activity
ligand binding
molecular dynamics
mutant
mutational analysis
Mycobacterium tuberculosis
nonhuman
oxidation
oxygen affinity
site directed mutagenesis
structure analysis
wild type
Bacterial Proteins
Binding Sites
Carbon Monoxide
Computer Simulation
Crystallography, X-Ray
Ligands
Mutagenesis, Site-Directed
Mycobacterium tuberculosis
Nitric Oxide
Oxygen
Phenylalanine
Protein Structure, Tertiary
Truncated Hemoglobins
Mycobacterium tuberculosis
topic alanine
dioxygenase
heme
isoleucine
nitric oxide dioxygenase
oxygen
phenylalanine
phenylalanine 15
truncated hemoglobin
truncated hemoglobin N
tryptophan
tyrosine
unclassified drug
article
conformational transition
controlled study
detoxification
down regulation
enzyme activity
ligand binding
molecular dynamics
mutant
mutational analysis
Mycobacterium tuberculosis
nonhuman
oxidation
oxygen affinity
site directed mutagenesis
structure analysis
wild type
Bacterial Proteins
Binding Sites
Carbon Monoxide
Computer Simulation
Crystallography, X-Ray
Ligands
Mutagenesis, Site-Directed
Mycobacterium tuberculosis
Nitric Oxide
Oxygen
Phenylalanine
Protein Structure, Tertiary
Truncated Hemoglobins
Mycobacterium tuberculosis
dc.description.none.fl_txt_mv The truncated hemoglobin N, HbN, of Mycobacterium tuberculosis is endowed with a potent nitric oxide dioxygenase (NOD) activity that allows it to relieve nitrosative stress and enhance in vivo survival of its host. Despite its small size, the protein matrix of HbN hosts a two-branched tunnel, consisting of orthogonal short and long channels, that connects the heme active site to the protein surface. A novel dual-path mechanism has been suggested to drive migration of O 2 and NO to the distal heme cavity. While oxygen migrates mainly by the short path, a ligand-induced conformational change regulates opening of the long tunnel branch for NO, via a phenylalanine (PheE15) residue that acts as a gate. Site-directed mutagenesis and molecular simulations have been used to examine the gating role played by PheE15 in modulating the NOD function of HbN. Mutants carrying replacement of PheE15 with alanine, isoleucine, tyrosine and tryptophan have similar O 2 /CO association kinetics, but display significant reduction in their NOD function. Molecular simulations substantiated that mutation at the PheE15 gate confers significant changes in the long tunnel, and therefore may affect the migration of ligands. These results support the pivotal role of PheE15 gate in modulating the diffusion of NO via the long tunnel branch in the oxygenated protein, and hence the NOD function of HbN. © 2012 Oliveira et al.
Fil:Martí, M.A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina.
Fil:Boechi, L. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina.
Fil:Estrin, D.A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina.
description The truncated hemoglobin N, HbN, of Mycobacterium tuberculosis is endowed with a potent nitric oxide dioxygenase (NOD) activity that allows it to relieve nitrosative stress and enhance in vivo survival of its host. Despite its small size, the protein matrix of HbN hosts a two-branched tunnel, consisting of orthogonal short and long channels, that connects the heme active site to the protein surface. A novel dual-path mechanism has been suggested to drive migration of O 2 and NO to the distal heme cavity. While oxygen migrates mainly by the short path, a ligand-induced conformational change regulates opening of the long tunnel branch for NO, via a phenylalanine (PheE15) residue that acts as a gate. Site-directed mutagenesis and molecular simulations have been used to examine the gating role played by PheE15 in modulating the NOD function of HbN. Mutants carrying replacement of PheE15 with alanine, isoleucine, tyrosine and tryptophan have similar O 2 /CO association kinetics, but display significant reduction in their NOD function. Molecular simulations substantiated that mutation at the PheE15 gate confers significant changes in the long tunnel, and therefore may affect the migration of ligands. These results support the pivotal role of PheE15 gate in modulating the diffusion of NO via the long tunnel branch in the oxygenated protein, and hence the NOD function of HbN. © 2012 Oliveira et al.
publishDate 2012
dc.date.none.fl_str_mv 2012
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/20.500.12110/paper_19326203_v7_n11_p_Oliveira
url http://hdl.handle.net/20.500.12110/paper_19326203_v7_n11_p_Oliveira
dc.language.none.fl_str_mv eng
language eng
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by/2.5/ar
eu_rights_str_mv openAccess
rights_invalid_str_mv http://creativecommons.org/licenses/by/2.5/ar
dc.format.none.fl_str_mv application/pdf
dc.source.none.fl_str_mv PLoS ONE 2012;7(11)
reponame:Biblioteca Digital (UBA-FCEN)
instname:Universidad Nacional de Buenos Aires. Facultad de Ciencias Exactas y Naturales
instacron:UBA-FCEN
reponame_str Biblioteca Digital (UBA-FCEN)
collection Biblioteca Digital (UBA-FCEN)
instname_str Universidad Nacional de Buenos Aires. Facultad de Ciencias Exactas y Naturales
instacron_str UBA-FCEN
institution UBA-FCEN
repository.name.fl_str_mv Biblioteca Digital (UBA-FCEN) - Universidad Nacional de Buenos Aires. Facultad de Ciencias Exactas y Naturales
repository.mail.fl_str_mv ana@bl.fcen.uba.ar
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