We would like to thank Dr. Weicheng Bei (at College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, China) and Dr. Pat Blackall (at Queensland Alliance for Agriculture and Food Innovation, UQ, Australia) for the generous donation of A. pleuropneumoniae strains. We thank Dr. Jinrong Min (at Chromatin Structural Biology and Epigenetics, University of Toronto, Toronto, Canada) for the prediction of protein structure. This research was supported by grants from the National Nature Science Foundation of China (31101820) and the Fundamental Research Funds for the Central Universities (CCNU15A05037).