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Graded Structural Polymorphism in a Bacterial Thermosensor Protein.

Abhishek Narayan1, Luis A Campos2, Sandhya Bhatia3

  • 1Department of Biotechnology, Bhupat & Jyoti Mehta School of Biosciences, Indian Institute of Technology Madras (IITM) , Chennai 600036, India.

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|December 20, 2016
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Summary
This summary is machine-generated.

Pathogenic bacteria use thermosensing to control virulence. Researchers studied the Cnu protein, revealing its fourth helix acts as a thermosensing module, crucial for bacterial temperature adaptation and virulence gene regulation.

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Area of Science:

  • Molecular Biology
  • Biophysics
  • Microbiology

Background:

  • Thermosensing is vital for pathogenic bacteria to regulate virulence gene expression in warm-blooded hosts.
  • Hha-family proteins in enterobacteriaceae are known to modulate gene expression in response to temperature changes.
  • Limited molecular-level understanding exists regarding how temperature shifts are transduced into protein structural and functional changes.

Purpose of the Study:

  • To elucidate the conformational dynamics and molecular mechanisms of the Cnu protein, a putative bacterial thermosensor.
  • To investigate how temperature variations influence the structure and function of Cnu at a molecular level.
  • To understand the folding-functional landscape and signal transduction principles of the Hha protein family.

Main Methods:

  • Employed diverse spectroscopic, calorimetric, and hydrodynamic measurements to characterize Cnu's conformational behavior.
  • Utilized site-specific fluorescence and Nuclear Magnetic Resonance (NMR) experiments.
  • Integrated multiple computational approaches, including statistical mechanical modeling and molecular dynamics (MD) simulations (coarse-grained and all-atom).

Main Results:

  • Cnu exhibits probe-dependent unfolding, increased structural fluctuations, and temperature-dependent dimensional swelling within the physiological temperature range, indicating a malleable native ensemble.
  • The fourth helix of Cnu functions as a distinct thermosensing module, showing dynamic changes in order and orientation with temperature.
  • A continuous unfolding transition was observed, driven by the thermosensing module's response to temperature modulation.

Conclusions:

  • The study reveals the complex folding-functional landscape of the Cnu thermosensor protein.
  • Identified the molecular basis for Cnu's unfolding complexity and its role in signal transduction.
  • Highlighted the influence of functional constraints on protein folding mechanisms and the design principles of Hha family thermosensors.