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박혜지,박창진,배나희,한상욱 한국식물병리학회 2016 Plant Pathology Journal Vol.32 No.3
A bacterial tyrosine sulfotransferase, RaxST, is re-quired for activation of rice XA21-mediated im-munity, and it catalyzes sulfation of tyrosine residues of Omp1X and RaxX in Xanthomonas oryzae pv. oryzae, a causal agent of bacterial blight in rice. Although RaxST is biochemically well-characterized, bio logical functions of tyrosine sulfation have not been fully elucidated. We compared protein expression patterns between the wildtype and a raxST knockout mutant using shotgun proteomic analysis. Forty nine proteins displayed a more than 1.5-fold difference in their expression between the wildtype and the mutant strains. Clusters of orthologous groups analysis revealed that proteins involved in cell motility were most abundant, and phenotypic observation also showed that the twitching motility of the mutant was dramatically changed. These results indicate that tyrosine sulfation by RaxST is essential for Xoo move-ment, and they provide new insights into the biological roles of RaxST in cellular processes.
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