A type III effector ADP-ribosylates RNA-binding proteins and quells plant immunity

Fu ZQ, Guo M, Jeong B-ryool, Tian F, Elthon TE, Cerny RL, Staiger D, Alfano JR (2007)
Nature 447(7142): 284-288.

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Abstract
The bacterial plant pathogen Pseudomonas syringae injects effector proteins into host cells through a type III protein secretion system to cause disease. The enzymatic activities of most of P. syringae effectors and their targets remain obscure. Here we show that the type III effector HopU1 is a mono-ADP-ribosyltransferase (ADP-RT). HopU1 suppresses plant innate immunity in a manner dependent on its ADP-RT active site. The HopU1 substrates in Arabidopsis thaliana extracts were RNA-binding proteins that possess RNA-recognition motifs (RRMs). A. thaliana knockout lines defective in the glycine-rich RNA-binding protein GRP7 ( also known as AtGRP7), a HopU1 substrate, were more susceptible than wild-type plants to P. syringae. The ADP-ribosylation of GRP7 by HopU1 required two arginines within the RRM, indicating that this modification may interfere with GRP7' s ability to bind RNA. Our results suggest a pathogenic strategy where the ADP-ribosylation of RNA-binding proteins quells host immunity by affecting RNA metabolism and the plant defence transcriptome.
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Fu ZQ, Guo M, Jeong B-ryool, et al. A type III effector ADP-ribosylates RNA-binding proteins and quells plant immunity. Nature. 2007;447(7142):284-288.
Fu, Z. Q., Guo, M., Jeong, B. -ryool, Tian, F., Elthon, T. E., Cerny, R. L., Staiger, D., et al. (2007). A type III effector ADP-ribosylates RNA-binding proteins and quells plant immunity. Nature, 447(7142), 284-288.
Fu, Z. Q., Guo, M., Jeong, B. -ryool, Tian, F., Elthon, T. E., Cerny, R. L., Staiger, D., and Alfano, J. R. (2007). A type III effector ADP-ribosylates RNA-binding proteins and quells plant immunity. Nature 447, 284-288.
Fu, Z.Q., et al., 2007. A type III effector ADP-ribosylates RNA-binding proteins and quells plant immunity. Nature, 447(7142), p 284-288.
Z.Q. Fu, et al., “A type III effector ADP-ribosylates RNA-binding proteins and quells plant immunity”, Nature, vol. 447, 2007, pp. 284-288.
Fu, Z.Q., Guo, M., Jeong, B.-ryool, Tian, F., Elthon, T.E., Cerny, R.L., Staiger, D., Alfano, J.R.: A type III effector ADP-ribosylates RNA-binding proteins and quells plant immunity. Nature. 447, 284-288 (2007).
Fu, Zheng Qing, Guo, Ming, Jeong, Byeong-ryool, Tian, Fang, Elthon, Thomas E., Cerny, Ronald L., Staiger, Dorothee, and Alfano, James R. “A type III effector ADP-ribosylates RNA-binding proteins and quells plant immunity”. Nature 447.7142 (2007): 284-288.
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