Enteropathogenic E. coli effectors EspG1/G2 disrupt tight junctions: new roles and mechanisms
Article first published online: 25 JUN 2012
© 2012 New York Academy of Sciences.
Annals of the New York Academy of Sciences
Volume 1258, Barriers and Channels Formed by Tight Junction Proteins II pages 149–158, July 2012
How to Cite
Glotfelty, L. G. and Hecht, G. A. (2012), Enteropathogenic E. coli effectors EspG1/G2 disrupt tight junctions: new roles and mechanisms. Annals of the New York Academy of Sciences, 1258: 149–158. doi: 10.1111/j.1749-6632.2012.06563.x
- Issue published online: 25 JUN 2012
- Article first published online: 25 JUN 2012
- tight junctions;
Enteropathogenic E. coli (EPEC) infection is a major cause of infantile diarrhea in the developing world. Using a type-three secretion system, bacterial effector proteins are transferred to the host cell cytosol where they affect multiple physiological functions, ultimately leading to diarrheal disease. Disruption of intestinal epithelial cell tight junctions is a major consequence of EPEC infection and is mediated by multiple effector proteins, among them EspG1 and its homologue EspG2. EspG1/G2 contribute to loss of barrier function via an undefined mechanism that may be linked to their disruption of microtubule networks. Recently new investigations have identified additional roles for EspG. Sequestration of active ADP-ribosylating factor (ARF) proteins and promotion of p21-activated kinase (PAK) activity as well as inhibition of Golgi-mediated protein secretion have all been linked to EspG. In this review, we examine the functions of EspG1/G2 and discuss potential mechanisms of EspG-mediated tight junction disruption.