Title The quorum sensing regulator OpaR is a repressor of polar flagellum genes in Vibrio parahaemolyticus
Author Renfei Lu1, Junfang Sun1, Yue Qiu3, Miaomiao Zhang3, Xingfan Xue3, Xue Li1, Wenhui Yang4, Dongsheng Zhou4, Lingfei Hu4*, and Yiquan Zhang2,3*
Address 1Department of Clinical Laboratory, Nantong Third Hospital Affiliated to Nantong University, Nantong 212006, P. R. China, 2Wuxi School of Medicine, Jiangnan University, Wuxi 214122, P. R. China, 3School of Medicine, Jiangsu University, Zhenjiang 212013, P. R. China, 4State Key Laboratory of Pathogen and Biosecurity, Beijing Institute of Microbiology and Epidemiology, Beijing 100071, P. R. China
Bibliography Journal of Microbiology, 59(7),651–657, 2021,
DOI 10.1007/s12275-021-0629-3
Key Words Vibrio parahaemolyticus, polar flagellum, quorum sensing, OpaR
Abstract Vibrio parahaemolyticus possesses two types of flagella: a single polar flagellum (Pof) for swimming and the peritrichous lateral flagella (Laf) for swarming. Expression of Laf genes has previously been reported to be regulated by the quorum sensing (QS) regulators AphA and OpaR. In the present study, we showed that OpaR, the QS regulator at high cell density (HCD), acted as a negative regulator of swimming motility and the transcription of Pof genes in V. parahaemolyticus. OpaR bound to the promoter-proximal DNA regions of flgAMN, flgMN, and flgBCDEFGHIJ within the Pof gene loci to repress their transcription, whereas it negatively regulates the transcription of flgKL-flaC in an indirect manner. Thus, this work investigated how QS regulated the swimming motility via direct action of its master regulator OpaR on the transcription of Pof genes in V. parahaemolyticus.