期刊
EMBO JOURNAL
卷 40, 期 2, 页码 -出版社
WILEY
DOI: 10.15252/embj.2020105699
关键词
effector; EBP2; c-Myc; proliferation; virulence
资金
- Howard Hughes Medical Institute
- University of Connecticut research funds
The study revealed that the T3SS effector VgpA in Vibrio parahaemolyticus interacts with the host cell nucleolus protein EBP2, leading to re-localization of c-Myc and increased cell proliferation. This interaction enhances EBP2 affinity for c-Myc, prolonging the oncoprotein's half-life and ultimately contributing to the pathogenesis of V. parahaemolyticus infection.
Pathogen type 3 secretion systems (T3SS) manipulate host cell pathways by directly delivering effector proteins into host cells. In Vibrio parahaemolyticus, the leading cause of bacterial seafood-borne diarrheal disease, we showed that a T3SS effector, VgpA, localizes to the host cell nucleolus where it binds Epstein-Barr virus nuclear antigen 1-binding protein 2 (EBP2). An amino acid substitution in VgpA (VgpA(L10A)) did not alter its translocation to the nucleus but abolished the effector's capacity to interact with EBP2. VgpA-EBP2 interaction led to the re-localization of c-Myc to the nucleolus and increased cellular rRNA expression and proliferation of cultured cells. The VgpA-EBP2 interaction elevated EBP2's affinity for c-Myc and prolonged the oncoprotein's half-life. Studies in infant rabbits demonstrated that VgpA is translocated into intestinal epithelial cells, where it interacts with EBP2 and leads to nucleolar re-localization of c-Myc. Moreover, the in vivo VgpA-EBP2 interaction during infection led to proliferation of intestinal cells and heightened V. parahaemolyticus' colonization and virulence. These observations suggest that direct effector stimulation of a c-Myc controlled host cell growth program can contribute to pathogenesis.
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