A Truncated Form of SpoT, Including the ACT Domain, Inhibits the Production of Cyclic Lipopeptide Arthrofactin, and Is Associated with Moderate Elevation of Guanosine 3′,5′-Bispyrophosphate Level in<i>Pseudomonas</i>sp. MIS38

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  • WASHIO Kenji
    Division of Biosphere Science, Graduate School of Environmental Science, Hokkaido University
  • LIM Siew Ping
    School of Science, Monash University Sunway Campus Sdn Bhd
  • ROONGSAWANG Niran
    BIOTEC Central Research Unit, Thai National Center for Genetic Engineering and Biotechnology
  • MORIKAWA Masaaki
    Division of Biosphere Science, Graduate School of Environmental Science, Hokkaido University

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  • A Truncated Form of SpoT, Including the ACT Domain, Inhibits the Production of Cyclic Lipopeptide Arthrofactin, and Is Associated with Moderate Elevation of Guanosine 3',5'-Bispyrophosphate Level in Pseudomonas sp. MIS38

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Arthrofactin is a biosurfactant produced by Pseudomonas sp. MIS38. We have reported that transposon insertion into spoT (spoT::Tn5) causes moderate accumulation of guanosine 3′,5′-bispyrophosphate (ppGpp) and abrogates arthrofactin production. To analyze the linkage of SpoT function and ablation of arthrofactin production, we examined the spoT::Tn5 mutation. The results showed that spoT::Tn5 is not a null mutation, but encodes separate segments of SpoT. Deletion of the 3′ region of spoT increased the level of arthrofactin production, suggesting that the C-terminal region of SpoT plays a suppressive role. We evaluated the expression of a distinct segment of SpoT. Forced expression of the C-terminal region that contains the ACT domain resulted in the accumulation of ppGpp and abrogated arthrofactin production. Expression of the C-terminal segment also reduced MIS38 swarming and resulted in extensive biofilm formation, which constitutes the phenocopy of the spoT::Tn5 mutant.

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