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Structural and functional analyses of the Porphyromonas gingivalis type IX secretion system PorN protein
Porphyromonas gingivalis, the major human pathogen bacterium associated with periodontal diseases, secretes virulence factors through the Bacteroidetes-specific type IX secretion system (T9SS). Effector proteins of the T9SS are recognized by the complex via their conserved C-terminal domains (CTDs)....
Autores principales: | , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
American Society for Biochemistry and Molecular Biology
2022
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8861641/ https://www.ncbi.nlm.nih.gov/pubmed/35065963 http://dx.doi.org/10.1016/j.jbc.2022.101618 |
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author | Fuchsbauer, Olivier Lunar Silva, Ignacio Cascales, Eric Roussel, Alain Leone, Philippe |
author_facet | Fuchsbauer, Olivier Lunar Silva, Ignacio Cascales, Eric Roussel, Alain Leone, Philippe |
author_sort | Fuchsbauer, Olivier |
collection | PubMed |
description | Porphyromonas gingivalis, the major human pathogen bacterium associated with periodontal diseases, secretes virulence factors through the Bacteroidetes-specific type IX secretion system (T9SS). Effector proteins of the T9SS are recognized by the complex via their conserved C-terminal domains (CTDs). Among the 18 proteins essential for T9SS function in P. gingivalis, PorN is a periplasmic protein that forms large ring-shaped structures in association with the PorK outer membrane lipoprotein. PorN also mediates contacts with the PorM subunit of the PorLM energetic module, and with the effector’s CTD. However, no information is available on the PorN structure and on the implication of PorN domains for T9SS assembly and effector recognition. Here we present the crystal structure of PorN at 2.0-Å resolution, which represents a novel fold with no significant similarity to any known structure. In agreement with in silico analyses, we also found that the N- and C-terminal regions of PorN are intrinsically disordered. Our functional studies showed that the N-terminal disordered region is involved in PorN dimerization while the C-terminal disordered region is involved in the interaction with PorK. Finally, we determined that the folded PorN central domain is involved in the interaction with PorM, as well as with the effector’s CTD. Altogether, these results lay the foundations for a more comprehensive model of T9SS architecture and effector transport. |
format | Online Article Text |
id | pubmed-8861641 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2022 |
publisher | American Society for Biochemistry and Molecular Biology |
record_format | MEDLINE/PubMed |
spelling | pubmed-88616412022-02-27 Structural and functional analyses of the Porphyromonas gingivalis type IX secretion system PorN protein Fuchsbauer, Olivier Lunar Silva, Ignacio Cascales, Eric Roussel, Alain Leone, Philippe J Biol Chem Research Article Porphyromonas gingivalis, the major human pathogen bacterium associated with periodontal diseases, secretes virulence factors through the Bacteroidetes-specific type IX secretion system (T9SS). Effector proteins of the T9SS are recognized by the complex via their conserved C-terminal domains (CTDs). Among the 18 proteins essential for T9SS function in P. gingivalis, PorN is a periplasmic protein that forms large ring-shaped structures in association with the PorK outer membrane lipoprotein. PorN also mediates contacts with the PorM subunit of the PorLM energetic module, and with the effector’s CTD. However, no information is available on the PorN structure and on the implication of PorN domains for T9SS assembly and effector recognition. Here we present the crystal structure of PorN at 2.0-Å resolution, which represents a novel fold with no significant similarity to any known structure. In agreement with in silico analyses, we also found that the N- and C-terminal regions of PorN are intrinsically disordered. Our functional studies showed that the N-terminal disordered region is involved in PorN dimerization while the C-terminal disordered region is involved in the interaction with PorK. Finally, we determined that the folded PorN central domain is involved in the interaction with PorM, as well as with the effector’s CTD. Altogether, these results lay the foundations for a more comprehensive model of T9SS architecture and effector transport. American Society for Biochemistry and Molecular Biology 2022-01-21 /pmc/articles/PMC8861641/ /pubmed/35065963 http://dx.doi.org/10.1016/j.jbc.2022.101618 Text en © 2022 The Authors https://creativecommons.org/licenses/by-nc-nd/4.0/This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/). |
spellingShingle | Research Article Fuchsbauer, Olivier Lunar Silva, Ignacio Cascales, Eric Roussel, Alain Leone, Philippe Structural and functional analyses of the Porphyromonas gingivalis type IX secretion system PorN protein |
title | Structural and functional analyses of the Porphyromonas gingivalis type IX secretion system PorN protein |
title_full | Structural and functional analyses of the Porphyromonas gingivalis type IX secretion system PorN protein |
title_fullStr | Structural and functional analyses of the Porphyromonas gingivalis type IX secretion system PorN protein |
title_full_unstemmed | Structural and functional analyses of the Porphyromonas gingivalis type IX secretion system PorN protein |
title_short | Structural and functional analyses of the Porphyromonas gingivalis type IX secretion system PorN protein |
title_sort | structural and functional analyses of the porphyromonas gingivalis type ix secretion system porn protein |
topic | Research Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8861641/ https://www.ncbi.nlm.nih.gov/pubmed/35065963 http://dx.doi.org/10.1016/j.jbc.2022.101618 |
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