Antibody-based inhibition of pathogenic new world hemorrhagic fever mammarenaviruses by steric occlusion of the human transferrin receptor 1 apical domain
- Autores
- Ferrero, Sol; Flores, Maria D.; Short, Connor; Vázquez, Cecilia Alejandra; Clark, Lars E.; Ziegenbein, James; Zink, Samantha; Fuentes, Daniel; Payés, Cristian; Batto, María V.; Collazo, Michael; García, Cybele C.; Abraham, Jonathan; Cordo, Sandra Myriam; Rodriguez, Jose A.; Helguera, Gustavo Fernando
- Año de publicación
- 2021
- Idioma
- inglés
- Tipo de recurso
- artículo
- Estado
- versión publicada
- Descripción
- Pathogenic clade B New World mammarenaviruses (NWM) can cause Argentine, Venezuelan, Brazilian, and Bolivian hemorrhagic fevers. Sequence variability among NWM glycoproteins (GP) poses a challenge to the development of broadly neutralizing therapeutics against the entire clade of viruses. However, blockade of their shared binding site on the apical domain of human transferrin receptor 1 (hTfR1/CD71) presents an opportunity for the development of effective and broadly neutralizing therapeutics. Here, we demonstrate that the murine monoclonal antibody OKT9, which targets the apical domain of hTfR1, can sterically block cellular entry by viral particles presenting clade B NWM glycoproteins (GP1-GP2). OKT9 blockade is also effective against viral particles pseudotyped with glycoproteins of a recently identified pathogenic Sabia-like virus. With nanomolar affinity for hTfR1, the OKT9 antigen binding fragment (OKT9-Fab) sterically blocks clade B NWM-GP1s and reduces infectivity of an attenuated strain of Junin virus. Binding of OKT9 to the hTfR1 ectodomain in its soluble, dimeric state produces stable assemblies that are observable by negative-stain electron microscopy. A model of the OKT9-sTfR1 complex, informed by the known crystallographic structure of sTfR1 and a newly determined structure of the OKT9 antigen binding fragment (Fab), suggests that OKT9 and the Machupo virus GP1 share a binding site on the hTfR1 apical domain. The structural basis for this interaction presents a framework for the design and development of high-affinity, broadly acting agents targeting clade B NWMs. IMPORTANCE Pathogenic clade B NWMs cause grave infectious diseases, the South American hemorrhagic fevers. Their etiological agents are Junin (JUNV), Guanarito (GTOV), Sabiá (SABV), Machupo (MACV), Chapare (CHAV), and a new Sabiá-like (SABV-L) virus recently identified in Brazil. These are priority A pathogens due to their high infectivity and mortality, their potential for person-to-person transmission, and the limited availability of effective therapeutics and vaccines to curb their effects. While low homology between surface glycoproteins of NWMs foils efforts to develop broadly neutralizing therapies targeting NWMs, this work provides structural evidence that OKT9, a monoclonal antibody targeting a single NWM glycoprotein binding site on hTfR1, can efficiently prevent their entry into cells.
Fil: Ferrero, Sol. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Biología y Medicina Experimental. Fundación de Instituto de Biología y Medicina Experimental. Instituto de Biología y Medicina Experimental; Argentina
Fil: Flores, Maria D.. University of California at Los Angeles; Estados Unidos
Fil: Short, Connor. University of California at Los Angeles; Estados Unidos
Fil: Vázquez, Cecilia Alejandra. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Química Biológica; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Química Biológica de la Facultad de Ciencias Exactas y Naturales. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Química Biológica de la Facultad de Ciencias Exactas y Naturales; Argentina
Fil: Clark, Lars E.. Harvard Medical School; Estados Unidos
Fil: Ziegenbein, James. University of California at Los Angeles; Estados Unidos
Fil: Zink, Samantha. University of California at Los Angeles; Estados Unidos
Fil: Fuentes, Daniel. University of California at Los Angeles; Estados Unidos
Fil: Payés, Cristian. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Biología y Medicina Experimental. Fundación de Instituto de Biología y Medicina Experimental. Instituto de Biología y Medicina Experimental; Argentina
Fil: Batto, María V.. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Biología y Medicina Experimental. Fundación de Instituto de Biología y Medicina Experimental. Instituto de Biología y Medicina Experimental; Argentina
Fil: Collazo, Michael. University of California at Los Angeles; Estados Unidos
Fil: García, Cybele C.. Universidad de Buenos Aires; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Química Biológica de la Facultad de Ciencias Exactas y Naturales. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Química Biológica de la Facultad de Ciencias Exactas y Naturales; Argentina
Fil: Abraham, Jonathan. Harvard Medical School; Estados Unidos. Brigham and Women's Hospital; Estados Unidos
Fil: Cordo, Sandra Myriam. Universidad de Buenos Aires; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Química Biológica de la Facultad de Ciencias Exactas y Naturales. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Química Biológica de la Facultad de Ciencias Exactas y Naturales; Argentina
Fil: Rodriguez, Jose A.. University of California at Los Angeles; Estados Unidos
Fil: Helguera, Gustavo Fernando. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Biología y Medicina Experimental. Fundación de Instituto de Biología y Medicina Experimental. Instituto de Biología y Medicina Experimental; Argentina - Materia
-
ANTIVIRAL AGENTS
ELECTRON MICROSCOPY
JUNIN
MACHUPO
MAMMARENAVIRUS
MONOCLONAL ANTIBODIES
SABIÁ-LIKE
TRANSFERRIN RECEPTOR
X-RAY CRYSTALLOGRAPHY - Nivel de accesibilidad
- acceso abierto
- Condiciones de uso
- https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
- Repositorio
.jpg)
- Institución
- Consejo Nacional de Investigaciones Científicas y Técnicas
- OAI Identificador
- oai:ri.conicet.gov.ar:11336/148223
Ver los metadatos del registro completo
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Antibody-based inhibition of pathogenic new world hemorrhagic fever mammarenaviruses by steric occlusion of the human transferrin receptor 1 apical domainFerrero, SolFlores, Maria D.Short, ConnorVázquez, Cecilia AlejandraClark, Lars E.Ziegenbein, JamesZink, SamanthaFuentes, DanielPayés, CristianBatto, María V.Collazo, MichaelGarcía, Cybele C.Abraham, JonathanCordo, Sandra MyriamRodriguez, Jose A.Helguera, Gustavo FernandoANTIVIRAL AGENTSELECTRON MICROSCOPYJUNINMACHUPOMAMMARENAVIRUSMONOCLONAL ANTIBODIESSABIÁ-LIKETRANSFERRIN RECEPTORX-RAY CRYSTALLOGRAPHYhttps://purl.org/becyt/ford/3.4https://purl.org/becyt/ford/3Pathogenic clade B New World mammarenaviruses (NWM) can cause Argentine, Venezuelan, Brazilian, and Bolivian hemorrhagic fevers. Sequence variability among NWM glycoproteins (GP) poses a challenge to the development of broadly neutralizing therapeutics against the entire clade of viruses. However, blockade of their shared binding site on the apical domain of human transferrin receptor 1 (hTfR1/CD71) presents an opportunity for the development of effective and broadly neutralizing therapeutics. Here, we demonstrate that the murine monoclonal antibody OKT9, which targets the apical domain of hTfR1, can sterically block cellular entry by viral particles presenting clade B NWM glycoproteins (GP1-GP2). OKT9 blockade is also effective against viral particles pseudotyped with glycoproteins of a recently identified pathogenic Sabia-like virus. With nanomolar affinity for hTfR1, the OKT9 antigen binding fragment (OKT9-Fab) sterically blocks clade B NWM-GP1s and reduces infectivity of an attenuated strain of Junin virus. Binding of OKT9 to the hTfR1 ectodomain in its soluble, dimeric state produces stable assemblies that are observable by negative-stain electron microscopy. A model of the OKT9-sTfR1 complex, informed by the known crystallographic structure of sTfR1 and a newly determined structure of the OKT9 antigen binding fragment (Fab), suggests that OKT9 and the Machupo virus GP1 share a binding site on the hTfR1 apical domain. The structural basis for this interaction presents a framework for the design and development of high-affinity, broadly acting agents targeting clade B NWMs. IMPORTANCE Pathogenic clade B NWMs cause grave infectious diseases, the South American hemorrhagic fevers. Their etiological agents are Junin (JUNV), Guanarito (GTOV), Sabiá (SABV), Machupo (MACV), Chapare (CHAV), and a new Sabiá-like (SABV-L) virus recently identified in Brazil. These are priority A pathogens due to their high infectivity and mortality, their potential for person-to-person transmission, and the limited availability of effective therapeutics and vaccines to curb their effects. While low homology between surface glycoproteins of NWMs foils efforts to develop broadly neutralizing therapies targeting NWMs, this work provides structural evidence that OKT9, a monoclonal antibody targeting a single NWM glycoprotein binding site on hTfR1, can efficiently prevent their entry into cells.Fil: Ferrero, Sol. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Biología y Medicina Experimental. Fundación de Instituto de Biología y Medicina Experimental. Instituto de Biología y Medicina Experimental; ArgentinaFil: Flores, Maria D.. University of California at Los Angeles; Estados UnidosFil: Short, Connor. University of California at Los Angeles; Estados UnidosFil: Vázquez, Cecilia Alejandra. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Química Biológica; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Química Biológica de la Facultad de Ciencias Exactas y Naturales. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Química Biológica de la Facultad de Ciencias Exactas y Naturales; ArgentinaFil: Clark, Lars E.. Harvard Medical School; Estados UnidosFil: Ziegenbein, James. University of California at Los Angeles; Estados UnidosFil: Zink, Samantha. University of California at Los Angeles; Estados UnidosFil: Fuentes, Daniel. University of California at Los Angeles; Estados UnidosFil: Payés, Cristian. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Biología y Medicina Experimental. Fundación de Instituto de Biología y Medicina Experimental. Instituto de Biología y Medicina Experimental; ArgentinaFil: Batto, María V.. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Biología y Medicina Experimental. Fundación de Instituto de Biología y Medicina Experimental. Instituto de Biología y Medicina Experimental; ArgentinaFil: Collazo, Michael. University of California at Los Angeles; Estados UnidosFil: García, Cybele C.. Universidad de Buenos Aires; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Química Biológica de la Facultad de Ciencias Exactas y Naturales. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Química Biológica de la Facultad de Ciencias Exactas y Naturales; ArgentinaFil: Abraham, Jonathan. Harvard Medical School; Estados Unidos. Brigham and Women's Hospital; Estados UnidosFil: Cordo, Sandra Myriam. Universidad de Buenos Aires; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Química Biológica de la Facultad de Ciencias Exactas y Naturales. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Química Biológica de la Facultad de Ciencias Exactas y Naturales; ArgentinaFil: Rodriguez, Jose A.. University of California at Los Angeles; Estados UnidosFil: Helguera, Gustavo Fernando. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Biología y Medicina Experimental. Fundación de Instituto de Biología y Medicina Experimental. Instituto de Biología y Medicina Experimental; ArgentinaAmerican Society for Microbiology2021-09info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/148223Ferrero, Sol; Flores, Maria D.; Short, Connor; Vázquez, Cecilia Alejandra; Clark, Lars E.; et al.; Antibody-based inhibition of pathogenic new world hemorrhagic fever mammarenaviruses by steric occlusion of the human transferrin receptor 1 apical domain; American Society for Microbiology; Journal of Virology; 95; 17; 9-20210022-538XCONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://journals.asm.org/doi/10.1128/JVI.01868-20?url_ver=Z39.88-2003&rfr_id=ori:rid:crossref.org&rfr_dat=cr_pub%20%200pubmedinfo:eu-repo/semantics/altIdentifier/doi/10.1128/JVI.01868-20info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T10:21:35Zoai:ri.conicet.gov.ar:11336/148223instacron: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 10:21:35.622CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse |
| dc.title.none.fl_str_mv |
Antibody-based inhibition of pathogenic new world hemorrhagic fever mammarenaviruses by steric occlusion of the human transferrin receptor 1 apical domain |
| title |
Antibody-based inhibition of pathogenic new world hemorrhagic fever mammarenaviruses by steric occlusion of the human transferrin receptor 1 apical domain |
| spellingShingle |
Antibody-based inhibition of pathogenic new world hemorrhagic fever mammarenaviruses by steric occlusion of the human transferrin receptor 1 apical domain Ferrero, Sol ANTIVIRAL AGENTS ELECTRON MICROSCOPY JUNIN MACHUPO MAMMARENAVIRUS MONOCLONAL ANTIBODIES SABIÁ-LIKE TRANSFERRIN RECEPTOR X-RAY CRYSTALLOGRAPHY |
| title_short |
Antibody-based inhibition of pathogenic new world hemorrhagic fever mammarenaviruses by steric occlusion of the human transferrin receptor 1 apical domain |
| title_full |
Antibody-based inhibition of pathogenic new world hemorrhagic fever mammarenaviruses by steric occlusion of the human transferrin receptor 1 apical domain |
| title_fullStr |
Antibody-based inhibition of pathogenic new world hemorrhagic fever mammarenaviruses by steric occlusion of the human transferrin receptor 1 apical domain |
| title_full_unstemmed |
Antibody-based inhibition of pathogenic new world hemorrhagic fever mammarenaviruses by steric occlusion of the human transferrin receptor 1 apical domain |
| title_sort |
Antibody-based inhibition of pathogenic new world hemorrhagic fever mammarenaviruses by steric occlusion of the human transferrin receptor 1 apical domain |
| dc.creator.none.fl_str_mv |
Ferrero, Sol Flores, Maria D. Short, Connor Vázquez, Cecilia Alejandra Clark, Lars E. Ziegenbein, James Zink, Samantha Fuentes, Daniel Payés, Cristian Batto, María V. Collazo, Michael García, Cybele C. Abraham, Jonathan Cordo, Sandra Myriam Rodriguez, Jose A. Helguera, Gustavo Fernando |
| author |
Ferrero, Sol |
| author_facet |
Ferrero, Sol Flores, Maria D. Short, Connor Vázquez, Cecilia Alejandra Clark, Lars E. Ziegenbein, James Zink, Samantha Fuentes, Daniel Payés, Cristian Batto, María V. Collazo, Michael García, Cybele C. Abraham, Jonathan Cordo, Sandra Myriam Rodriguez, Jose A. Helguera, Gustavo Fernando |
| author_role |
author |
| author2 |
Flores, Maria D. Short, Connor Vázquez, Cecilia Alejandra Clark, Lars E. Ziegenbein, James Zink, Samantha Fuentes, Daniel Payés, Cristian Batto, María V. Collazo, Michael García, Cybele C. Abraham, Jonathan Cordo, Sandra Myriam Rodriguez, Jose A. Helguera, Gustavo Fernando |
| author2_role |
author author author author author author author author author author author author author author author |
| dc.subject.none.fl_str_mv |
ANTIVIRAL AGENTS ELECTRON MICROSCOPY JUNIN MACHUPO MAMMARENAVIRUS MONOCLONAL ANTIBODIES SABIÁ-LIKE TRANSFERRIN RECEPTOR X-RAY CRYSTALLOGRAPHY |
| topic |
ANTIVIRAL AGENTS ELECTRON MICROSCOPY JUNIN MACHUPO MAMMARENAVIRUS MONOCLONAL ANTIBODIES SABIÁ-LIKE TRANSFERRIN RECEPTOR X-RAY CRYSTALLOGRAPHY |
| purl_subject.fl_str_mv |
https://purl.org/becyt/ford/3.4 https://purl.org/becyt/ford/3 |
| dc.description.none.fl_txt_mv |
Pathogenic clade B New World mammarenaviruses (NWM) can cause Argentine, Venezuelan, Brazilian, and Bolivian hemorrhagic fevers. Sequence variability among NWM glycoproteins (GP) poses a challenge to the development of broadly neutralizing therapeutics against the entire clade of viruses. However, blockade of their shared binding site on the apical domain of human transferrin receptor 1 (hTfR1/CD71) presents an opportunity for the development of effective and broadly neutralizing therapeutics. Here, we demonstrate that the murine monoclonal antibody OKT9, which targets the apical domain of hTfR1, can sterically block cellular entry by viral particles presenting clade B NWM glycoproteins (GP1-GP2). OKT9 blockade is also effective against viral particles pseudotyped with glycoproteins of a recently identified pathogenic Sabia-like virus. With nanomolar affinity for hTfR1, the OKT9 antigen binding fragment (OKT9-Fab) sterically blocks clade B NWM-GP1s and reduces infectivity of an attenuated strain of Junin virus. Binding of OKT9 to the hTfR1 ectodomain in its soluble, dimeric state produces stable assemblies that are observable by negative-stain electron microscopy. A model of the OKT9-sTfR1 complex, informed by the known crystallographic structure of sTfR1 and a newly determined structure of the OKT9 antigen binding fragment (Fab), suggests that OKT9 and the Machupo virus GP1 share a binding site on the hTfR1 apical domain. The structural basis for this interaction presents a framework for the design and development of high-affinity, broadly acting agents targeting clade B NWMs. IMPORTANCE Pathogenic clade B NWMs cause grave infectious diseases, the South American hemorrhagic fevers. Their etiological agents are Junin (JUNV), Guanarito (GTOV), Sabiá (SABV), Machupo (MACV), Chapare (CHAV), and a new Sabiá-like (SABV-L) virus recently identified in Brazil. These are priority A pathogens due to their high infectivity and mortality, their potential for person-to-person transmission, and the limited availability of effective therapeutics and vaccines to curb their effects. While low homology between surface glycoproteins of NWMs foils efforts to develop broadly neutralizing therapies targeting NWMs, this work provides structural evidence that OKT9, a monoclonal antibody targeting a single NWM glycoprotein binding site on hTfR1, can efficiently prevent their entry into cells. Fil: Ferrero, Sol. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Biología y Medicina Experimental. Fundación de Instituto de Biología y Medicina Experimental. Instituto de Biología y Medicina Experimental; Argentina Fil: Flores, Maria D.. University of California at Los Angeles; Estados Unidos Fil: Short, Connor. University of California at Los Angeles; Estados Unidos Fil: Vázquez, Cecilia Alejandra. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Química Biológica; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Química Biológica de la Facultad de Ciencias Exactas y Naturales. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Química Biológica de la Facultad de Ciencias Exactas y Naturales; Argentina Fil: Clark, Lars E.. Harvard Medical School; Estados Unidos Fil: Ziegenbein, James. University of California at Los Angeles; Estados Unidos Fil: Zink, Samantha. University of California at Los Angeles; Estados Unidos Fil: Fuentes, Daniel. University of California at Los Angeles; Estados Unidos Fil: Payés, Cristian. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Biología y Medicina Experimental. Fundación de Instituto de Biología y Medicina Experimental. Instituto de Biología y Medicina Experimental; Argentina Fil: Batto, María V.. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Biología y Medicina Experimental. Fundación de Instituto de Biología y Medicina Experimental. Instituto de Biología y Medicina Experimental; Argentina Fil: Collazo, Michael. University of California at Los Angeles; Estados Unidos Fil: García, Cybele C.. Universidad de Buenos Aires; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Química Biológica de la Facultad de Ciencias Exactas y Naturales. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Química Biológica de la Facultad de Ciencias Exactas y Naturales; Argentina Fil: Abraham, Jonathan. Harvard Medical School; Estados Unidos. Brigham and Women's Hospital; Estados Unidos Fil: Cordo, Sandra Myriam. Universidad de Buenos Aires; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Química Biológica de la Facultad de Ciencias Exactas y Naturales. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Química Biológica de la Facultad de Ciencias Exactas y Naturales; Argentina Fil: Rodriguez, Jose A.. University of California at Los Angeles; Estados Unidos Fil: Helguera, Gustavo Fernando. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Biología y Medicina Experimental. Fundación de Instituto de Biología y Medicina Experimental. Instituto de Biología y Medicina Experimental; Argentina |
| description |
Pathogenic clade B New World mammarenaviruses (NWM) can cause Argentine, Venezuelan, Brazilian, and Bolivian hemorrhagic fevers. Sequence variability among NWM glycoproteins (GP) poses a challenge to the development of broadly neutralizing therapeutics against the entire clade of viruses. However, blockade of their shared binding site on the apical domain of human transferrin receptor 1 (hTfR1/CD71) presents an opportunity for the development of effective and broadly neutralizing therapeutics. Here, we demonstrate that the murine monoclonal antibody OKT9, which targets the apical domain of hTfR1, can sterically block cellular entry by viral particles presenting clade B NWM glycoproteins (GP1-GP2). OKT9 blockade is also effective against viral particles pseudotyped with glycoproteins of a recently identified pathogenic Sabia-like virus. With nanomolar affinity for hTfR1, the OKT9 antigen binding fragment (OKT9-Fab) sterically blocks clade B NWM-GP1s and reduces infectivity of an attenuated strain of Junin virus. Binding of OKT9 to the hTfR1 ectodomain in its soluble, dimeric state produces stable assemblies that are observable by negative-stain electron microscopy. A model of the OKT9-sTfR1 complex, informed by the known crystallographic structure of sTfR1 and a newly determined structure of the OKT9 antigen binding fragment (Fab), suggests that OKT9 and the Machupo virus GP1 share a binding site on the hTfR1 apical domain. The structural basis for this interaction presents a framework for the design and development of high-affinity, broadly acting agents targeting clade B NWMs. IMPORTANCE Pathogenic clade B NWMs cause grave infectious diseases, the South American hemorrhagic fevers. Their etiological agents are Junin (JUNV), Guanarito (GTOV), Sabiá (SABV), Machupo (MACV), Chapare (CHAV), and a new Sabiá-like (SABV-L) virus recently identified in Brazil. These are priority A pathogens due to their high infectivity and mortality, their potential for person-to-person transmission, and the limited availability of effective therapeutics and vaccines to curb their effects. While low homology between surface glycoproteins of NWMs foils efforts to develop broadly neutralizing therapies targeting NWMs, this work provides structural evidence that OKT9, a monoclonal antibody targeting a single NWM glycoprotein binding site on hTfR1, can efficiently prevent their entry into cells. |
| publishDate |
2021 |
| dc.date.none.fl_str_mv |
2021-09 |
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info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion http://purl.org/coar/resource_type/c_6501 info:ar-repo/semantics/articulo |
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article |
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publishedVersion |
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http://hdl.handle.net/11336/148223 Ferrero, Sol; Flores, Maria D.; Short, Connor; Vázquez, Cecilia Alejandra; Clark, Lars E.; et al.; Antibody-based inhibition of pathogenic new world hemorrhagic fever mammarenaviruses by steric occlusion of the human transferrin receptor 1 apical domain; American Society for Microbiology; Journal of Virology; 95; 17; 9-2021 0022-538X CONICET Digital CONICET |
| url |
http://hdl.handle.net/11336/148223 |
| identifier_str_mv |
Ferrero, Sol; Flores, Maria D.; Short, Connor; Vázquez, Cecilia Alejandra; Clark, Lars E.; et al.; Antibody-based inhibition of pathogenic new world hemorrhagic fever mammarenaviruses by steric occlusion of the human transferrin receptor 1 apical domain; American Society for Microbiology; Journal of Virology; 95; 17; 9-2021 0022-538X CONICET Digital CONICET |
| dc.language.none.fl_str_mv |
eng |
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eng |
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American Society for Microbiology |
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American Society for Microbiology |
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CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas |
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dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar |
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