Dynamics of the adhesion complex of the human pathogens Mycoplasma pneumoniae and Mycoplasma genitalium
Mycoplasma pneumoniae and Mycoplasma genitalium are bacterial wall-less human pathogens and the causative agents of respiratory and reproductive tract infections. Infectivity, gliding motility and adhesion of these mycoplasmas to host cells are mediated by orthologous adhesin proteins forming a tran...
| Autores: | , , , , , , , , , , , , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2025 |
| País: | España |
| Institución: | Institut d'Investigació i Innovació Parc Taulí (I3PT) |
| Repositorio: | r-I3PT. Repositorio Institucional Producción Científica del Institut d'Investigació i Innovació Parc Taulí |
| OAI Identifier: | oai:i3pt.fundanetsuite.com:p6312 |
| Acceso en línea: | https://i3pt.portalinvestigacion.com/publicaciones/6312 https://www.scopus.com/inward/record.uri?eid=2-s2.0-105001655101&doi=10.1371%2Fjournal.ppat.1012973&partnerID=40&md5=eea9e7e6c87994dcff8907a60e7a4867 |
| Access Level: | acceso abierto |
| Palabra clave: | epitope monoclonal antibody oligosaccharide adhesin Article cell adhesion cell invasion controlled study crystal structure dynamics Escherichia coli flow cytometry genital tract infection human human cell immunofluorescence microscopy light scattering mouse Mycoplasma genitalium Mycoplasma genitalium infection Mycoplasma pneumoniae nonhuman pathogenesis polyacrylamide gel electrophoresis Sanger sequencing scanning electron microscopy size exclusion chromatography Western blotting bacterium adherence chemistry cryoelectron microscopy genetics immunology metabolism microbiology Mycoplasma infection physiology Adhesins, Bacterial Bacterial Adhesion Cryoelectron Microscopy Humans Mycoplasma Infections |
| Sumario: | Mycoplasma pneumoniae and Mycoplasma genitalium are bacterial wall-less human pathogens and the causative agents of respiratory and reproductive tract infections. Infectivity, gliding motility and adhesion of these mycoplasmas to host cells are mediated by orthologous adhesin proteins forming a transmembrane adhesion complex that binds to sialylated oligosaccharides human cell ligands. Here we report the cryo-EM structure of M. pneumoniae P1 adhesin bound to the Fab fragment of monoclonal antibody P1/MCA4, which stops gliding and induces detachment of motile cells. The epitope of P1/MCA4 involves residues only from the small C-domain of P1. This epitope is accessible to antibodies only in the "closed conformation" of the adhesion complex and is not accessible in the "open" conformation, when the adhesion complex is ready for attachment to sialylated oligosaccharides. Polyclonal antibodies generated against the large N-domain of P1 or against the whole ectodomain of P40/P90 have little or no effects on adhesion or motility. Moreover, mutations in the highly conserved Engelman motifs found in the transmembrane helix of M. genitalium P110 adhesin also alter adhesion and motility. These results show that antibodies directed to the C-domain of P1 hinder the large conformational rearrangements in this domain required to alternate between the "open" and "closed" conformations of the adhesion complex. Since transition between both conformations is essential to complete the attachment/detachment cycle of the adhesion complex, interfering with the gliding of mycoplasma cells and providing a new potential target to confront M. pneumoniae and M. genitalium infections. |
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