title: Characterization of genes encoding proteins containing HD-related output domain in Xanthomonas campestris pv. campestris.
abstract: The Gram-negative plant pathogen Xanthomonas campestris pv. campestris (Xcc) is the causative agent of black rot in crucifers. The production of Xcc virulence factors is regulated by Clp and RpfF. HD-related output domain (HDOD) is a protein domain of unknown biochemical function. The genome of Xcc encodes three proteins (GsmR, HdpA, and HdpB) with an HDOD. The GsmR has been reported to play a role in the general stress response and cell motility and its expression is positively regulated by Clp. Here, the function and transcription of hdpA and hdpB were characterized. Mutation of hdpA resulted in enhanced bacterial attachment. In addition, the expression of hdpA was positively regulated by RpfF but not by Clp, subject to catabolite repression and affected by several stress conditions. However, mutational analysis and reporter assay showed that hdpB had no effect on the production of a range of virulence factors and its expression was independent of Clp and RpfF. The results shown here not only extend the previous work on RpfF regulation to show that it influences the expression of hdpA in Xcc, but also expand knowledge of the function of the HDOD containing proteins in bacteria.
authors.affiliation: Institute of Biotechnology, Central Taiwan University of Science and Technology, Taichung, 40601, Taiwan.
authors.forename: Hsien-Ming
authors.initials: HM
authors.lastname: Lee
authors.affiliation: Department of Medical Laboratory Science and Biotechnology, Central Taiwan University of Science and Technology, Taichung, 40601, Taiwan.
authors.forename: Chao-Tsai
authors.initials: CT
authors.lastname: Liao
authors.affiliation: Department of Medical Laboratory Science and Biotechnology, Central Taiwan University of Science and Technology, Taichung, 40601, Taiwan.
authors.forename: Ying-Chuan
authors.initials: YC
authors.lastname: Chiang
authors.affiliation: Institute of Biotechnology, Central Taiwan University of Science and Technology, Taichung, 40601, Taiwan.
authors.forename: Yu-Yin
authors.initials: YY
authors.lastname: Chang
authors.affiliation: Department of Medical Laboratory Science and Biotechnology, Central Taiwan University of Science and Technology, Taichung, 40601, Taiwan.
authors.forename: Yu-Tzu
authors.initials: YT
authors.lastname: Yeh
authors.affiliation: Department of Medical Laboratory Science and Biotechnology, Central Taiwan University of Science and Technology, Taichung, 40601, Taiwan.
authors.forename: Shin-Chiao
authors.initials: SC
authors.lastname: Du
authors.affiliation: Department of Medical Laboratory Science and Biotechnology, Central Taiwan University of Science and Technology, Taichung, 40601, Taiwan. ymhsiao@ctust.edu.tw.
authors.forename: Yi-Min
authors.initials: YM
authors.lastname: Hsiao
mesh_terms: D000595:Amino Acid Sequence; D001426:Bacterial Proteins / Q000235:genetics* / Q000378:metabolism; D001483:Base Sequence; D015964:Gene Expression Regulation, Bacterial; D016680:Genome, Bacterial; D009154:Mutation; D010944:Plants / Q000382:microbiology*; D016415:Sequence Alignment; D014157:Transcription Factors / Q000235:genetics / Q000378:metabolism; D037521:Virulence Factors / Q000096:biosynthesis / Q000235:genetics; D016959:Xanthomonas campestris / Q000235:genetics*
chemical_list: D001426:Bacterial Proteins; C436751:Clp protein, Xanthomonas campestris; C419552:RpfG protein, Xanthomonas campestris; D014157:Transcription Factors; D037521:Virulence Factors
keywords: Bacterial attachment; Transcriptional regulation; Xanthomonas