Structural and functional analysis of an anchorless fibronectin-binding protein FBPS from Gram-positive bacterium Streptococcus suis

A.M. M. Musyoki, Z. Shi, C. Xuan, G. Lu, J. Qi, F. Gao, B. Zheng, Q. Zhang, Y. Li, Joel D. Haywood, C. Liu, J. Yan, Y. Shi, G.F. F. Gao

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© 2016, National Academy of Sciences. All rights reserved.The anchorless fibronectin-binding proteins (FnBPs) are a group of important virulence factors for which the structures are not available and the functions are not well defined. In this study we performed comprehensive studies on a prototypic member of this group: the fibronectin-/fibrinogen-binding protein from Streptococcus suis (FBPS). The structures of the N- and C-terminal halves (FBPS-N and FBPS-C), which together cover the full-length protein in sequence, were solved at a resolution of 2.1 and 2.6 Å, respectively, and each was found to be composed of two domains with unique folds. Furthermore, we have elucidated the organization of these domains by small-angle X-ray scattering. We further showed that the fibronectin-binding site is located in FBPS-C and that FBPS promotes the adherence of S. suis to host cells by attaching the bacteria via FBPS-N. Finally, we demonstrated that FBPS functions both as an adhesin, promoting S. suis attachment to host cells, and as a bacterial factor, activating signaling pathways via ß1 integrin receptors to induce chemokine production.
Original languageEnglish
Pages (from-to)13869-13874
Number of pages6
JournalProceedings of the National Academy of Sciences of the United States of America
Issue number48
Publication statusPublished - 2016
Externally publishedYes


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