Co-Authors:
Han, S.-W., Department of Plant Pathology and the Genome Center, University of California Davis, Davis, CA, United States
Sriariyanun, M., Department of Plant Pathology and the Genome Center, University of California Davis, Davis, CA, United States, Department of Chemical and Process Engineering, Thai-German Graduate School of Engineering, King Mongkut's University of Technology North Bangkok, Bangkok, Thailand
Lee, S.-W., Department of Plant Pathology and the Genome Center, University of California Davis, Davis, CA, United States, The Department of Plant Molecular System Biotechnology and Crop Biotech Institute, Kyung Hee University, Yongin, South Korea
Sharma, M., Department of Plant Pathology and the Genome Center, University of California Davis, Davis, CA, United States
Bahar, O., Department of Plant Pathology and the Genome Center, University of California Davis, Davis, CA, United States
Bower, Z., Department of Plant Pathology and the Genome Center, University of California Davis, Davis, CA, United States
Ronald, P.C., Department of Plant Pathology and the Genome Center, University of California Davis, Davis, CA, United States, The Department of Plant Molecular System Biotechnology and Crop Biotech Institute, Kyung Hee University, Yongin, South Korea
Abstract:
The rice XA21 pattern recognition receptor binds a type I secreted sulfated peptide, called axY S22, derived from the Ax21 (activator of XA21-mediated immunity) protein. The conservation of Ax21 in all sequenced Xanthomonas spp. and closely related genera suggests that Ax21 serves a key biological function. Here we show that the predicted N-terminal sequence of Ax21 is cleaved prior to secretion outside the cell and that mature Ax21 serves as a quorum sensing (QS) factor in Xanthomonas oryzae pv. oryzae. Ax21-mediated QS controls motility, biofilm formation and virulence. We provide genetic evidence that the Xoo RaxH histidine kinase serves as the bacterial receptor for Ax21. This work establishes a critical role for small protein-mediated QS in a Gram-negative bacterium. © 2011 Han et al.
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