Download MendeleyFunctional and Structural Characterization of the Antiphagocytic Properties of a Novel Transglutaminase from Streptococcus suis
Yu, J., Pian, Y., Ge, J., Guo, J., Zheng, Y., Jiang, H., Hao, H., Yuan, Y., Jiang, Y., Yang, M.(2015) J Biol Chem 290: 19081-19092
- PubMed: 26085092
- DOI: https://doi.org/10.1074/jbc.M115.643338
- Primary Citation of Related Structures:
4XZ7 - PubMed Abstract:
Streptococcus suis serotype 2 (Ss2) is an important swine and human zoonotic pathogen. In the present study, we identified a novel secreted immunogenic protein, SsTGase, containing a highly conserved eukaryotic-like transglutaminase (TGase) domain at the N terminus. We found that inactivation of SsTGase significantly reduced the virulence of Ss2 in a pig infection model and impaired its antiphagocytosis in human blood. We further solved the crystal structure of the N-terminal portion of the protein in homodimer form at 2.1 Å. Structure-based mutagenesis and biochemical studies suggested that disruption of the homodimer directly resulted in the loss of its TGase activity and antiphagocytic ability. Characterization of SsTGase as a novel virulence factor of Ss2 by acting as a TGase would be beneficial for developing new therapeutic agents against Ss2 infections.
Organizational Affiliation:
From the State Key Laboratory of Pathogen and Biosecurity, Beijing Institute of Microbiology and Epidemiology, Beijing 100071, China, Key Laboratory for Protein Sciences of Ministry of Education, Tsinghua-Peking Center for Life Sciences, School of Life Sciences, Tsinghua University, Beijing 100084, China, and.
