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The SARS coronavirus E protein interacts with the PALS1 and alters tight junction formation and epithelial morphogenesis
BMC Proceedings volume 5, Article number: P79 (2011)
Intercellular tight junctions define epithelial apicobasal polarity and form a physical fence which protects underlying tissues from pathogen invasions. PALS1, a tight junction-associated protein, is a member of the CRUMBS3-PALS1-PATJ polarity complex, which is crucial for the establishment and maintenance of epithelial polarity in mammals. Here we report that the carboxy-terminal domain of the SARS-CoV E small envelope protein (E) binds to human PALS1. Using co-immunoprecipitation and pull-down assays, we show that E interacts with PALS1 in mammalian cells and further demonstrate that the last four carboxy-terminal amino-acids of E form a novel PDZ-binding motif that binds to PALS1 PDZ domain. PALS1 redistributes to the virion assembly site, where E is enriched, in SARS-CoV-infected Vero E6 cells. Ectopic expression of E in MDCKII epithelial cells significantly alters cellular polarity and induces formation of cysts with multiple lumens. We show that E expression delays formation of tight junctions and affects the subcelullar distribution of the apical and tight junction markers GP135 and ZO-1, respectively. We speculate that hijacking of PALS1 by SARS-CoV E plays a determinant role in the disruption of the lung epithelium in SARS patients.
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Teoh, KT., Siu, YL., Chan, WL. et al. The SARS coronavirus E protein interacts with the PALS1 and alters tight junction formation and epithelial morphogenesis. BMC Proc 5 (Suppl 1), P79 (2011). https://doi.org/10.1186/1753-6561-5-S1-P79
- Tight Junction
- Tight Junction Formation
- Intercellular Tight Junction
- Apicobasal Polarity
- Delay Formation