- The quorum sensing regulator OpaR is a repressor of polar flagellum genes in Vibrio parahaemolyticus
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Renfei Lu , Junfang Sun , Yue Qiu , Miaomiao Zhang , Xingfan Xue , Xue Li , Wenhui Yang , Dongsheng Zhou , Lingfei Hu , Yiquan Zhang
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J. Microbiol. 2021;59(7):651-657. Published online June 1, 2021
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DOI: https://doi.org/10.1007/s12275-021-0629-3
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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.
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Zhijun Zhong , Yufei Wang , Jie Xu , Yanfen Chen , Yuehua Ke , Xiaoyan Zhou , Xitong Yuan , Dongsheng Zhou , Yi Yang , Ruifu Yang , Guangneng Peng , Hai Jiang , Jing Yuan , Hongbin Song , Buyun Cui , Liuyu Huang , Zeliang Chen
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J. Microbiol. 2012;50(4):567-574. Published online August 25, 2012
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DOI: https://doi.org/10.1007/s12275-012-2022-8
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772
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The genus Brucella is divided into six species; of these, B. melitensis and B. abortus are pathogenic to humans, and B. ovis and B. neotomae are nonpathogenic to humans. The definition of gene loss and acquisition is essential for understanding Brucella’s ecology, evolutionary history, and host relationships. A DNA microarray containing unique genes of B. melitensis Type strain 16MT and B. abortus 9-941 was constructed and used to determine the gene contents of the representative strains of Brucella. Phylogenetic relationships were inferred from sequences of housekeeping genes. Gene loss and acquisition of different Brucella species were inferred. A total of 214 genes were found to be differentially distributed, and 173 of them were clustered into 15 genomic islands (GIs). Evidence of horizontal gene transfer was observed for 10 GIs. Phylogenetic analysis indicated that the 19 strains formed five clades, and some of the GIs had been lost or acquired independently among the different lineages. The derivation of Brucella lineages is concomitant with the parallel loss or acquisition of GIs, indicating a complex interaction between various Brucella species and hosts.
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- DNA Microarray-Based Global Transcriptional Profiling of Yersinia pestis in Multicellularity
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Jingfu Qiu , Zhaobiao Guo , Haihong Liu , Dongsheng Zhou , Yanping Han , Ruifu Yang
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J. Microbiol. 2008;46(5):557-563. Published online October 31, 2008
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DOI: https://doi.org/10.1007/s12275-008-0140-0
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721
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Yersinia pestis, the causative agent of plague, has a feature of forming multicellular aggregates at liquid-air interface around the wall of glass tube. In this study, we employed the whole-genome DNA microarray of Y. pestis to investigate the global transcriptional profile in multicellularity compared with that in its planktonic growth. A total of 177 genes were differentially expressed in Y. pestis during early stage of multicellular formation; Seventy genes of them were up-regulated while 107 down-regulated. In addition to a large number of genes encoding unknown functions, most of the induced genes encode cell envelope and transport/binding proteins. The up-regulation of amino acid biosynthesis, the differentially altered genes that are involved in virulence, and the cold shock protein genes were for the first time reported to be associated with the multicellular formation. Our results revealed the global gene expression of Y. pestis were changed in the formation of multicellularity, providing insights into the molecular mechanism of multicellular behaviour, which need investigating further.
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