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- W2079427461 abstract "Exoenzyme S (ExoS) is a bifunctional virulence factor directly translocated into eukaryotic cells by the type III secretory process of Pseudomonas aeruginosa. Bacterial translocation of ExoS into epithelial cells is associated with diverse effects on cell function, including inhibition of growth, alterations in cell morphology, and effects on adherence processes. Preferred substrates of the ADP-ribosyltransferase (ADPRT) portion of ExoS include low molecular weight G-proteins (LMWG-proteins) in the Ras family. In examining the ADP-ribosylation and functional effects of ExoS on RalA, ExoS was found to ADP-ribosylate endogenous RalA and recombinant RalAΔCAAX at multiple sites, with Arg52 identified as the preferred site of ADP-ribosylation. The binding of RalA to the Ral binding domain (RBD) of its downstream effector, RalBP1, was inhibited by bacterially translocated ExoS, indicating an effect of ExoS on cellular RalA function. In vitro analyses confirmed that ADP-ribosylation of RalA directly interfered with its ability to bind to the RBD of RalBP1. The studies support the fact that RalA is a cellular substrate of bacterially translocated ExoS and that ADP-ribosylation by ExoS affects RalA interaction with its downstream effector, RalBP1." @default.
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- W2079427461 date "2002-06-29" @default.
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- W2079427461 title "ADP-Ribosylation and Functional Effects of <i>Pseudomonas </i>Exoenzyme S on Cellular RalA" @default.
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- W2079427461 doi "https://doi.org/10.1021/bi025826n" @default.
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