Light signalling mediated by Per-ARNT-Sim domain-containing proteins in Xanthomonas campestris pv. campestris

Authors

  • Daqing Mao,

    1. School of Life Sciences, Tsinghua University, Beijing, China
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  • Jun Tao,

    1. State Key Laboratory of Plant Genomics, Institute of Microbiology, Chinese Academy of Sciences, Beijing, China
    2. CAS Key Laboratory of Pathogenic Microbiology and Immunology, Institute of Microbiology, Chinese Academy of Sciences, Beijing, China
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  • Chunxia Li,

    1. State Key Laboratory of Plant Genomics, Institute of Microbiology, Chinese Academy of Sciences, Beijing, China
    2. Graduate School of Chinese Academy of Sciences, Beijing, China
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  • Chao Luo,

    1. School of Life Sciences, Tsinghua University, Beijing, China
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  • Linlin Zheng,

    1. School of Life Sciences, Tsinghua University, Beijing, China
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  • Chaozu He

    Corresponding author
    1. State Key Laboratory of Plant Genomics, Institute of Microbiology, Chinese Academy of Sciences, Beijing, China
    2. Hainan Key Laboratory for Sustainable Utilization of Tropical Bioresource, Hainan University, Haikou, China
    • School of Life Sciences, Tsinghua University, Beijing, China
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Correspondence: Chaozu He, Hainan Key Laboratory for Sustainable Utilization of Tropical Bioresource, Hainan University, Haikou 570228, China. Tel.: +86 10 64807395; fax: +86 10 64807395; e-mail: hechz@im.ac.cn

Abstract

Per-ARNT-Sim (PAS) domains are important signalling modules that possibly monitor changes in various stimuli such as light. For the majority of PAS domains that have been identified by sequence similarity, the biological function of the signalling pathways has not yet been experimentally investigated. Thirty-three PAS proteins were discovered in Xanthomonas campestris pv. campestris (Xcc) by genome/proteome analysis. Thirteen PAS proteins were identified as contributing to light signalling and Xcc growth, motility or virulence using molecular genetics and bioinformatics methods. The PAS domains played important roles in light signalling to regulate the growth, motility and virulence of Xcc. They might be regulated by not only light quality (wavelength) but also quantity (intensity) as potential light-signalling components. Evaluating the light wavelength, three light-signalling types of PAS proteins in Xcc were shown to be involved in blue light signalling, tricolour (blue, red and far-red) signalling or red/far-red signalling. This showed that Xcc had evolved a complicated light-signalling system to adapt to a complex environment.

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