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Yersinia YopJ Acetylates and Inhibits Kinase Activation by Blocking Phosphorylation
Sohini Mukherjee,1Gladys Keitany,1Yan Li,2,3Yong Wang,1Haydn L. Ball,2,3Elizabeth J. Goldsmith,3Kim Orth1*
Yersinia species use a variety of type III effector proteinsto target eukaryotic signaling systems. The effector YopJ inhibitsmitogen-activated protein kinase (MAPK) and the nuclear factorB (NFB) signaling pathways used in innate immune response bypreventing activation of the family of MAPK kinases (MAPKK).We show that YopJ acted as an acetyltransferase, using acetylcoenzymeA (CoA) to modify the critical serine and threonine residuesin the activation loop of MAPKK6 and thereby blocking phosphorylation.The acetylation on MAPKK6 directly competed with phosphorylation,preventing activation of the modified protein. This covalentmodification may be used as a general regulatory mechanism inbiological signaling.
1 Department of Molecular Biology, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA. 2 Protein Chemistry Technology Center, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA. 3 Department of Biochemistry, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA.
* To whom correspondence should be addressed. E-mail: Kim.Orth{at}utsouthwestern.edu
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