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Cited by 311

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Direct Visualization by Cryo-EM of the Mycobacterial Capsular Layer: A Labile Structure Containing ESX-1-Secreted Proteins

Open access
Sani, Musa, Houben, Edith N. G., Geurtsen, Jeroen, Pierson, Jason, de Punder, Karin, van Zon, Maaike, Wever, Brigitte, Piersma, Sander R., Jiménez, Connie R., Daffé, Mamadou, Appelmelk, Ben J., Bitter, Wilbert, van der Wel, Nicole, Peters, Peter J.·2010·PLoS Pathogens

Abstract

The cell envelope of mycobacteria, a group of Gram positive bacteria, is composed of a plasma membrane and a Gram-negative-like outer membrane containing mycolic acids. In addition, the surface of the mycobacteria is coated with an ill-characterized layer of extractable, non-covalently linked glycans, lipids and proteins, collectively known as the capsule, whose occurrence is a matter of debate. By using plunge freezing cryo-electron microscopy technique, we were able to show that pathogenic mycobacteria produce a thick capsule, only present when the cells were grown under unperturbed conditions and easily removed by mild detergents. This detergent-labile capsule layer contains arabinomannan, alpha-glucan and oligomannosyl-capped glycolipids. Further immunogenic and proteomic analyses revealed that Mycobacterium marinum capsule contains high amounts of proteins that are secreted via the ESX-1 pathway. Finally, cell infection experiments demonstrated the importance of the capsule for binding to cells and dampening of pro-inflammatory cytokine response. Together, these results show a direct visualization of the mycobacterial capsular layer as a labile structure that contains ESX-1-secreted proteins.

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Metadata

Authors
Sani, M., Houben, E. N. G., Geurtsen, J., Pierson, J., de Punder, K., van Zon, M., Wever, B., Piersma, S. R., Jiménez, C. R., Daffé, M., Appelmelk, B. J., Bitter, W., van der Wel, N., & Peters, P. J.
Venue
PLoS Pathogens
Published
2010-03-05
Volume
6
Issue
3
Pages
e1000794
ISSN
  • 1553-7366 (ISSN-L)
  • 1553-7374
OpenAlex
W2169882798
Cited by
311
References
6
FWCI
11.34
Type
journal article
Language
en
Open access
gold

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Sani, M., Houben, E. N. G., Geurtsen, J., Pierson, J., de Punder, K., van Zon, M., Wever, B., Piersma, S. R., Jiménez, C. R., Daffé, M., Appelmelk, B. J., Bitter, W., van der Wel, N., & Peters, P. J. (2010). Direct Visualization by Cryo-EM of the Mycobacterial Capsular Layer: A Labile Structure Containing ESX-1-Secreted Proteins. PLoS Pathogens. https://doi.org/10.1371/journal.ppat.1000794

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Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).

Semantic Scholar’s data is described in: Kinney, R., et al. (2023). The Semantic Scholar Open Data Platform. arXiv:2301.10140.