Mutational Replacements at the “Glycine Hinge” of the Escherichia coli Chemoreceptor Tsr Support a Signaling Role for the C-Helix Residue

Autores
Pedetta, Andrea; Massazza, Diego Ariel; Herrera Seitz, Karina; Studdert, Claudia Alicia
Año de publicación
2017
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Bacterial chemoreceptors are dimeric membrane proteins that transmit signals from a periplasmic ligand-binding domain to the interior of the cells. The highly conserved cytoplasmic domain consists of a long hairpin that in the dimer forms a four-helix coiled-coil bundle. The central region of the bundle couples changes in helix packing that occur in the membrane proximal region to the signaling tip, controlling the activity of an associated histidine kinase. This subdomain contains certain glycine residues that are postulated to form a hinge in chemoreceptors from enteric bacteria and have been largely postulated to play a role in the coupling mechanism, and/or in the formation of higher-order chemoreceptor assemblies. In this work, we directly assessed the importance of the “glycine hinge” by obtaining nonfunctional replacements at each of its positions in the Escherichia coli serine receptor Tsr and characterizing them. Our results indicate that, rather than being essential for proper receptor–receptor interaction, the “glycine hinge” residues are involved in the ability of the receptor to switch between different signaling states. Mainly, the C-helix residue G439 has a key role in shifting the equilibrium toward a kinase-activating conformation. However, we found second-site mutations that restore the chemotactic proficiency of some of the “glycine hinge” mutants, suggesting that a complete hinge is not strictly essential. Rather, glycine residues seem to favor the coupling activity that relies on some other structural features of the central subdomain.
Fil: Pedetta, Andrea. Universidad Nacional de Mar del Plata. Facultad de Ciencias Exactas y Naturales. Instituto de Investigaciones Biológicas; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Fil: Massazza, Diego Ariel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mar del Plata. Instituto de Investigaciones en Ciencia y Tecnología de Materiales. Universidad Nacional de Mar del Plata. Facultad de Ingeniería. Instituto de Investigaciones en Ciencia y Tecnología de Materiales; Argentina
Fil: Herrera Seitz, Karina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de Mar del Plata. Facultad de Ciencias Exactas y Naturales. Instituto de Investigaciones Biológicas; Argentina
Fil: Studdert, Claudia Alicia. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Agrobiotecnología del Litoral. Universidad Nacional del Litoral. Instituto de Agrobiotecnología del Litoral; Argentina
Materia
Chemorreceptor
Cytoplasmatic Domain
Glicine Hinge
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:11336/45431
Acceder
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oai_identifier_str oai:ri.conicet.gov.ar:11336/45431
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Mutational Replacements at the “Glycine Hinge” of the Escherichia coli Chemoreceptor Tsr Support a Signaling Role for the C-Helix ResiduePedetta, AndreaMassazza, Diego ArielHerrera Seitz, KarinaStuddert, Claudia AliciaChemorreceptorCytoplasmatic DomainGlicine Hingehttps://purl.org/becyt/ford/1.6https://purl.org/becyt/ford/1Bacterial chemoreceptors are dimeric membrane proteins that transmit signals from a periplasmic ligand-binding domain to the interior of the cells. The highly conserved cytoplasmic domain consists of a long hairpin that in the dimer forms a four-helix coiled-coil bundle. The central region of the bundle couples changes in helix packing that occur in the membrane proximal region to the signaling tip, controlling the activity of an associated histidine kinase. This subdomain contains certain glycine residues that are postulated to form a hinge in chemoreceptors from enteric bacteria and have been largely postulated to play a role in the coupling mechanism, and/or in the formation of higher-order chemoreceptor assemblies. In this work, we directly assessed the importance of the “glycine hinge” by obtaining nonfunctional replacements at each of its positions in the Escherichia coli serine receptor Tsr and characterizing them. Our results indicate that, rather than being essential for proper receptor–receptor interaction, the “glycine hinge” residues are involved in the ability of the receptor to switch between different signaling states. Mainly, the C-helix residue G439 has a key role in shifting the equilibrium toward a kinase-activating conformation. However, we found second-site mutations that restore the chemotactic proficiency of some of the “glycine hinge” mutants, suggesting that a complete hinge is not strictly essential. Rather, glycine residues seem to favor the coupling activity that relies on some other structural features of the central subdomain.Fil: Pedetta, Andrea. Universidad Nacional de Mar del Plata. Facultad de Ciencias Exactas y Naturales. Instituto de Investigaciones Biológicas; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Massazza, Diego Ariel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mar del Plata. Instituto de Investigaciones en Ciencia y Tecnología de Materiales. Universidad Nacional de Mar del Plata. Facultad de Ingeniería. Instituto de Investigaciones en Ciencia y Tecnología de Materiales; ArgentinaFil: Herrera Seitz, Karina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de Mar del Plata. Facultad de Ciencias Exactas y Naturales. Instituto de Investigaciones Biológicas; ArgentinaFil: Studdert, Claudia Alicia. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Agrobiotecnología del Litoral. Universidad Nacional del Litoral. Instituto de Agrobiotecnología del Litoral; ArgentinaAmerican Chemical Society2017-06info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/45431Pedetta, Andrea; Massazza, Diego Ariel; Herrera Seitz, Karina; Studdert, Claudia Alicia; Mutational Replacements at the “Glycine Hinge” of the Escherichia coli Chemoreceptor Tsr Support a Signaling Role for the C-Helix Residue; American Chemical Society; Biochemistry; 56; 29; 6-2017; 3850-38620006-2960CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://pubs.acs.org/doi/10.1021/acs.biochem.7b00455info:eu-repo/semantics/altIdentifier/doi/10.1021/acs.biochem.7b00455info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-10-22T12:07:53Zoai:ri.conicet.gov.ar:11336/45431instacron: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:34982025-10-22 12:07:53.527CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Mutational Replacements at the “Glycine Hinge” of the Escherichia coli Chemoreceptor Tsr Support a Signaling Role for the C-Helix Residue
title Mutational Replacements at the “Glycine Hinge” of the Escherichia coli Chemoreceptor Tsr Support a Signaling Role for the C-Helix Residue
spellingShingle Mutational Replacements at the “Glycine Hinge” of the Escherichia coli Chemoreceptor Tsr Support a Signaling Role for the C-Helix Residue
Pedetta, Andrea
Chemorreceptor
Cytoplasmatic Domain
Glicine Hinge
title_short Mutational Replacements at the “Glycine Hinge” of the Escherichia coli Chemoreceptor Tsr Support a Signaling Role for the C-Helix Residue
title_full Mutational Replacements at the “Glycine Hinge” of the Escherichia coli Chemoreceptor Tsr Support a Signaling Role for the C-Helix Residue
title_fullStr Mutational Replacements at the “Glycine Hinge” of the Escherichia coli Chemoreceptor Tsr Support a Signaling Role for the C-Helix Residue
title_full_unstemmed Mutational Replacements at the “Glycine Hinge” of the Escherichia coli Chemoreceptor Tsr Support a Signaling Role for the C-Helix Residue
title_sort Mutational Replacements at the “Glycine Hinge” of the Escherichia coli Chemoreceptor Tsr Support a Signaling Role for the C-Helix Residue
dc.creator.none.fl_str_mv Pedetta, Andrea
Massazza, Diego Ariel
Herrera Seitz, Karina
Studdert, Claudia Alicia
author Pedetta, Andrea
author_facet Pedetta, Andrea
Massazza, Diego Ariel
Herrera Seitz, Karina
Studdert, Claudia Alicia
author_role author
author2 Massazza, Diego Ariel
Herrera Seitz, Karina
Studdert, Claudia Alicia
author2_role author
author
author
dc.subject.none.fl_str_mv Chemorreceptor
Cytoplasmatic Domain
Glicine Hinge
topic Chemorreceptor
Cytoplasmatic Domain
Glicine Hinge
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.6
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv Bacterial chemoreceptors are dimeric membrane proteins that transmit signals from a periplasmic ligand-binding domain to the interior of the cells. The highly conserved cytoplasmic domain consists of a long hairpin that in the dimer forms a four-helix coiled-coil bundle. The central region of the bundle couples changes in helix packing that occur in the membrane proximal region to the signaling tip, controlling the activity of an associated histidine kinase. This subdomain contains certain glycine residues that are postulated to form a hinge in chemoreceptors from enteric bacteria and have been largely postulated to play a role in the coupling mechanism, and/or in the formation of higher-order chemoreceptor assemblies. In this work, we directly assessed the importance of the “glycine hinge” by obtaining nonfunctional replacements at each of its positions in the Escherichia coli serine receptor Tsr and characterizing them. Our results indicate that, rather than being essential for proper receptor–receptor interaction, the “glycine hinge” residues are involved in the ability of the receptor to switch between different signaling states. Mainly, the C-helix residue G439 has a key role in shifting the equilibrium toward a kinase-activating conformation. However, we found second-site mutations that restore the chemotactic proficiency of some of the “glycine hinge” mutants, suggesting that a complete hinge is not strictly essential. Rather, glycine residues seem to favor the coupling activity that relies on some other structural features of the central subdomain.
Fil: Pedetta, Andrea. Universidad Nacional de Mar del Plata. Facultad de Ciencias Exactas y Naturales. Instituto de Investigaciones Biológicas; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Fil: Massazza, Diego Ariel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mar del Plata. Instituto de Investigaciones en Ciencia y Tecnología de Materiales. Universidad Nacional de Mar del Plata. Facultad de Ingeniería. Instituto de Investigaciones en Ciencia y Tecnología de Materiales; Argentina
Fil: Herrera Seitz, Karina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de Mar del Plata. Facultad de Ciencias Exactas y Naturales. Instituto de Investigaciones Biológicas; Argentina
Fil: Studdert, Claudia Alicia. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Agrobiotecnología del Litoral. Universidad Nacional del Litoral. Instituto de Agrobiotecnología del Litoral; Argentina
description Bacterial chemoreceptors are dimeric membrane proteins that transmit signals from a periplasmic ligand-binding domain to the interior of the cells. The highly conserved cytoplasmic domain consists of a long hairpin that in the dimer forms a four-helix coiled-coil bundle. The central region of the bundle couples changes in helix packing that occur in the membrane proximal region to the signaling tip, controlling the activity of an associated histidine kinase. This subdomain contains certain glycine residues that are postulated to form a hinge in chemoreceptors from enteric bacteria and have been largely postulated to play a role in the coupling mechanism, and/or in the formation of higher-order chemoreceptor assemblies. In this work, we directly assessed the importance of the “glycine hinge” by obtaining nonfunctional replacements at each of its positions in the Escherichia coli serine receptor Tsr and characterizing them. Our results indicate that, rather than being essential for proper receptor–receptor interaction, the “glycine hinge” residues are involved in the ability of the receptor to switch between different signaling states. Mainly, the C-helix residue G439 has a key role in shifting the equilibrium toward a kinase-activating conformation. However, we found second-site mutations that restore the chemotactic proficiency of some of the “glycine hinge” mutants, suggesting that a complete hinge is not strictly essential. Rather, glycine residues seem to favor the coupling activity that relies on some other structural features of the central subdomain.
publishDate 2017
dc.date.none.fl_str_mv 2017-06
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/11336/45431
Pedetta, Andrea; Massazza, Diego Ariel; Herrera Seitz, Karina; Studdert, Claudia Alicia; Mutational Replacements at the “Glycine Hinge” of the Escherichia coli Chemoreceptor Tsr Support a Signaling Role for the C-Helix Residue; American Chemical Society; Biochemistry; 56; 29; 6-2017; 3850-3862
0006-2960
CONICET Digital
CONICET
url http://hdl.handle.net/11336/45431
identifier_str_mv Pedetta, Andrea; Massazza, Diego Ariel; Herrera Seitz, Karina; Studdert, Claudia Alicia; Mutational Replacements at the “Glycine Hinge” of the Escherichia coli Chemoreceptor Tsr Support a Signaling Role for the C-Helix Residue; American Chemical Society; Biochemistry; 56; 29; 6-2017; 3850-3862
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/url/https://pubs.acs.org/doi/10.1021/acs.biochem.7b00455
info:eu-repo/semantics/altIdentifier/doi/10.1021/acs.biochem.7b00455
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
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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score 12.982451

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