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  • 1Instituto de Biología Molecular y Celular de Rosario (IBR-CONICET) and Departamento de Microbiología, Facultad de Ciencias Bioquímicas y Farmacéuticas, Universidad Nacional de Rosario, Suipacha 531, Rosario, Argentina. cybulski@ibr.gov.ar

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Membrane Biology

Background:

  • Thermosensors are vital integral membrane proteins involved in numerous physiological processes.
  • The mechanism of temperature signal transmission by transmembrane (TM) domains remains largely unknown.
  • The histidine kinase DesK from Bacillus subtilis serves as a model for studying thermal adaptation.

Purpose of the Study:

  • To investigate the mechanism of TM-mediated temperature sensing.
  • To determine if a simplified sensor can retain thermosensing properties.
  • To explore the role of membrane properties in thermosensor function.

Main Methods:

  • Construction of a chimeric single-membrane-spanning minimal sensor (MS) from DesK.
  • In vivo and in vitro characterization of the MS.
  • Mutational analysis of the MS N terminus.
  • Biochemical assays to assess MS signal transmission.

Main Results:

  • The simplified MS fully retained the thermosensing properties of the parental DesK system.
  • A hydrophilic 'hot spot' at the MS N terminus was identified as crucial for sensing.
  • Membrane bilayer thickness was shown to control the sensor's signaling state by regulating hydration of the hot spot.
  • MS activity was biochemically demonstrated to be sensitive to bilayer thickness.

Conclusions:

  • Membrane thickness acts as a key regulator of thermosensor signaling.
  • The simplified MS provides a tractable system for studying TM-mediated temperature sensing.
  • Membrane thickness may represent a general cue for temperature detection across diverse organisms.