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Kong D, Chen Z, Wang J, Lv Q, Jiang H, Zheng Y, Xu M, Zhou X, Hao H, Jiang Y. Interaction of factor H-binding protein of Streptococcus suis with globotriaosylceramide promotes the development of meningitis. Virulence 2017; 8:1290-1302. [PMID: 28402705 DOI: 10.1080/21505594.2017.1317426] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
Abstract
Streptococcus suis is an important emerging zoonotic agent that causes acute bacterial meningitis in humans with high mortality and morbidity. Our previous work showed that factor H-binding protein (Fhb) contributed to virulence of S. suis, but the role of Fhb in the development of S. suis meningitis remained unclear. In this study, we demonstrated for the first time that Fhb contributed to the traversal of S. suis across the human blood-brain barrier by allelic-exchange mutagenesis, complementation and specific antibody blocking studies. We also showed that globotriaosylceramide (Gb3), the receptor of Fhb, was involved in this process and affected S. suis infection-induced activation of myosin light chain 2 through Rho/ROCK signaling in hCMEC/D3 cells. Using a murine model of S. suis meningitis, we further demonstrated that Gb3-deficiency prevented the mice from developing severe brain inflammation or injury. Our results demonstrate that the Fhb-Gb3 interaction plays an important role in the development of S. suis meningitis and might be a potential therapeutic target against S. suis infection.
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Affiliation(s)
- Decong Kong
- a State Key Laboratory of Pathogen and Biosecurity , Institute of Microbiology and Epidemiology, Academy of Military Medical Sciences , Beijing , China
| | - Zhe Chen
- a State Key Laboratory of Pathogen and Biosecurity , Institute of Microbiology and Epidemiology, Academy of Military Medical Sciences , Beijing , China.,b College of Biological Science & Technology , Shenyang Agricultural University , Shenyang , China
| | - Junping Wang
- a State Key Laboratory of Pathogen and Biosecurity , Institute of Microbiology and Epidemiology, Academy of Military Medical Sciences , Beijing , China.,d Urumqi Ethnic Cadres' College , Urumqi , China
| | - Qingyu Lv
- a State Key Laboratory of Pathogen and Biosecurity , Institute of Microbiology and Epidemiology, Academy of Military Medical Sciences , Beijing , China
| | - Hua Jiang
- a State Key Laboratory of Pathogen and Biosecurity , Institute of Microbiology and Epidemiology, Academy of Military Medical Sciences , Beijing , China
| | - Yuling Zheng
- a State Key Laboratory of Pathogen and Biosecurity , Institute of Microbiology and Epidemiology, Academy of Military Medical Sciences , Beijing , China
| | - Maokai Xu
- a State Key Laboratory of Pathogen and Biosecurity , Institute of Microbiology and Epidemiology, Academy of Military Medical Sciences , Beijing , China
| | - Xuyu Zhou
- c CAS Key Laboratory of Pathogenic Microbiology and Immunology , Institute of Microbiology, Chinese Academy of Sciences , Beijing , China
| | - Huaijie Hao
- c CAS Key Laboratory of Pathogenic Microbiology and Immunology , Institute of Microbiology, Chinese Academy of Sciences , Beijing , China
| | - Yongqiang Jiang
- a State Key Laboratory of Pathogen and Biosecurity , Institute of Microbiology and Epidemiology, Academy of Military Medical Sciences , Beijing , China
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Li X, Liu P, Gan S, Zhang C, Zheng Y, Jiang Y, Yuan Y. Mechanisms of Host-Pathogen Protein Complex Formation and Bacterial Immune Evasion of Streptococcus suis Protein Fhb. J Biol Chem 2016; 291:17122-32. [PMID: 27342778 DOI: 10.1074/jbc.m116.719443] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2016] [Indexed: 12/26/2022] Open
Abstract
Streptococcus suis serotype 2 (S. suis 2)-induced sepsis and meningitis are often accompanied by bacteremia. The evasion of polymorphonuclear leukocyte-mediated phagocytic clearance is central to the establishment of bacteremia caused by S. suis 2 and is facilitated by the ability of factor H (FH)-binding protein (Fhb) to bind FH on the bacterial surface, thereby impeding alternative pathway complement activation and phagocytic clearance. Here, C3b/C3d was found to bind to Fhb, along with FH, forming a large immune complex. The formation of this immune complex was mediated by domain II of Fhb via electrostatic and hydrophobic interactions, which, to our knowledge, is a new type of interaction. Interestingly, Fhb was found to be associated with the cell envelope and also present in the culture supernatant, where secreted Fhb inhibited complement activation via interactions with domain II, thereby enhancing antiphagocytic clearance by polymorphonuclear leukocytes. Thus, Fhb is a multifunctional bacterial protein, which binds host complement component C3 as well as FH and interferes with innate immune recognition in a secret protein manner. S. suis 2 therefore appears to have developed a new strategy to combat host innate immunity and enhance survival in host blood.
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Affiliation(s)
- Xueqin Li
- From the State Key Laboratory of Pathogen and Biosecurity, Beijing Institute of Microbiology and Epidemiology, Beijing 100071 and the Central Laboratory of Yijishan Hospital, Wannan Medical College, Wuhu 241001, China
| | - Peng Liu
- From the State Key Laboratory of Pathogen and Biosecurity, Beijing Institute of Microbiology and Epidemiology, Beijing 100071 and
| | - Shuzhen Gan
- From the State Key Laboratory of Pathogen and Biosecurity, Beijing Institute of Microbiology and Epidemiology, Beijing 100071 and
| | - Chunmao Zhang
- From the State Key Laboratory of Pathogen and Biosecurity, Beijing Institute of Microbiology and Epidemiology, Beijing 100071 and
| | - Yuling Zheng
- From the State Key Laboratory of Pathogen and Biosecurity, Beijing Institute of Microbiology and Epidemiology, Beijing 100071 and
| | - Yongqiang Jiang
- From the State Key Laboratory of Pathogen and Biosecurity, Beijing Institute of Microbiology and Epidemiology, Beijing 100071 and
| | - Yuan Yuan
- From the State Key Laboratory of Pathogen and Biosecurity, Beijing Institute of Microbiology and Epidemiology, Beijing 100071 and
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Zhang C, Hao H, Yu Y, Kong D, Chen S, Jiang H, Yuan Y, Zheng Y, Yang M, Jiang Y. Structural basis of the interaction between the meningitis pathogen Streptococcus suis adhesin Fhb and its human receptor. FEBS Lett 2016; 590:1384-92. [PMID: 27086582 DOI: 10.1002/1873-3468.12174] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2016] [Revised: 04/11/2016] [Accepted: 04/12/2016] [Indexed: 11/07/2022]
Abstract
The recently identified Streptococcus suis adhesin factor H-binding protein (Fhb) targets the host cellular receptor glycolipid GbO3 through its N terminus. However, it is unclear how Fhb interacts with its receptor. Here, we determined the complex structure of factor H-binding protein receptor-binding domain (Fhb RBD) with Gb2, an analog of its receptor, revealing that Gb2 binds in a pocket of the β sandwich core domain. We identified the key residues for Fhb RBD receptor binding using mutagenesis and isothermal titration calorimetry. Mutagenesis analyses indicated that Fhb binds to Gb2 mainly through hydrogen and hydrophobic interactions. Our findings provided structural insights into the Fhb-mediated host-pathogen interactions of S. suis.
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Affiliation(s)
- Chunmao Zhang
- State Key Laboratory of Pathogen and Biosecurity, Beijing Institute of Microbiology and Epidemiology, China
| | - Huaijie Hao
- State Key Laboratory of Pathogen and Biosecurity, Beijing Institute of Microbiology and Epidemiology, China
| | - You Yu
- Key Laboratory for Protein Sciences of Ministry of Education, Tsinghua-Peking Center for Life Sciences, School of Life Sciences, Tsinghua University, Beijing, China
| | - Decong Kong
- State Key Laboratory of Pathogen and Biosecurity, Beijing Institute of Microbiology and Epidemiology, China
| | - Shaolong Chen
- State Key Laboratory of Pathogen and Biosecurity, Beijing Institute of Microbiology and Epidemiology, China
| | - Hua Jiang
- State Key Laboratory of Pathogen and Biosecurity, Beijing Institute of Microbiology and Epidemiology, China
| | - Yuan Yuan
- State Key Laboratory of Pathogen and Biosecurity, Beijing Institute of Microbiology and Epidemiology, China
| | - Yuling Zheng
- State Key Laboratory of Pathogen and Biosecurity, Beijing Institute of Microbiology and Epidemiology, China
| | - Maojun Yang
- Key Laboratory for Protein Sciences of Ministry of Education, Tsinghua-Peking Center for Life Sciences, School of Life Sciences, Tsinghua University, Beijing, China
| | - Yongqiang Jiang
- State Key Laboratory of Pathogen and Biosecurity, Beijing Institute of Microbiology and Epidemiology, China
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