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Article
Localisation and Protein-protein Interactions of the Helicobacter pylori taxis sensor T1pD and Their Connection to Metabolic Functions
Scientific Reports
  • Wiebke Behrens, Hannover Medical School
  • Tobias Schweinitzer, Hannover Medical School
  • Jonathan L. McMurry, Kennesaw State University
  • Christine Josenhans, German Center of Infection Research
Department
Molecular & Cellular Biology
Document Type
Article
Publication Date
4-5-2016
Abstract

The Helicobacter pylori energy sensor TlpD determines tactic behaviour under low energy conditions and is important in vivo. We explored protein-protein interactions of TlpD and their impact on TlpD localisation and function. Pull-down of tagged TlpD identified protein interaction partners of TlpD, which included the chemotaxis histidine kinase CheAY2, the central metabolic enzyme aconitase (AcnB) and the detoxifying enzyme catalase (KatA). We confirmed that KatA and AcnB physically interact with TlpD. While the TlpD-dependent behavioural response appeared not influenced in the interactor mutants katA and acnB in steady-state behavioural assays, acetone carboxylase subunit (acxC) mutant behaviour was altered. TlpD was localised in a bipolar subcellular pattern in media of high energy. We observed a significant change in TlpD localisation towards the cell body in cheAY2-, catalase- or aconitase-deficient bacteria or in bacteria incubated under low energy conditions, including oxidative stress or respiratory inhibition. Inactivation of tlpD resulted in an increased sensitivity to iron limitation and oxidative stress and influenced the H. pylori transcriptome. Oxidative stress, iron limitation and overexpressing the iron-sulfur repair system nifSU altered TlpD-dependent behaviour. We propose that TlpD localisation is instructed by metabolic activity and protein interactions, and its sensory activity is linked to iron-sulfur cluster integrity.

Digital Object Identifier (DOI)
10.1038/srep23582
Citation Information
Wiebke Behrens, Tobias Schweinitzer, Jonathan L. McMurry and Christine Josenhans. "Localisation and Protein-protein Interactions of the Helicobacter pylori taxis sensor T1pD and Their Connection to Metabolic Functions" Scientific Reports Vol. 8 (2016) ISSN: 2045-2322
Available at: http://works.bepress.com/jonathan_mcmurry/56/