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Linking B-factor and temperature-induced conformational transition.

Fernando de Sá Ribeiro1, Luís Maurício T R Lima2

  • 1Laboratório de Biotecnologia Farmacêutica (pbiotech), Faculdade de Farmácia, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ 21941-902, Brazil; Programa de Pós-Graduação em Química Biológica, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, 21941-902, Brazil.

Biophysical Chemistry
|May 12, 2023
PubMed
Summary
This summary is machine-generated.

The crystallographic B-factor, or temperature factor, measures atomic vibrations in proteins. This study found that while B-factors increase with temperature, they do not necessarily correlate with protein conformational changes.

Keywords:
B-factorCrystallographyIon mobility spectrometryLysozymeTemperature

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Area of Science:

  • Structural Biology
  • Biophysics
  • Crystallography

Background:

  • The crystallographic B-factor (temperature factor or Debye-Waller factor) is commonly used to infer local protein flexibility.
  • Validating the B-factor as a reliable indicator of protein motion requires rigorous correlation with chemical and physical variables.

Purpose of the Study:

  • To investigate the thermal dependence of the crystallographic B-factor.
  • To assess the correlation between B-factor and protein conformational changes across a range of temperatures.

Main Methods:

  • High-resolution (1.5 Å) crystal protein structure coordinates and B-factors were determined across a wide temperature range (100 K to 325 K).
  • Analysis focused on the exponential thermal dependence of the B-factor and its relationship with atomic fluctuations and conformational dynamics.

Main Results:

  • An exponential thermal dependence of the B-factor was observed for both diffraction intensity data (Wilson B-factor) and all modeled atoms, with a consistent thermal diffusion constant (approximately 0.0045 K⁻¹).
  • The extrapolated B-factor at zero Kelvin (zero-point fluctuation) showed inter-atomic variation but lacked a clear correlation with temperature-dependent protein conformational changes.

Conclusions:

  • Atomic thermal vibrations, as indicated by the B-factor, may not directly correlate with the overall conformational dynamics of a protein.
  • The findings suggest a need for caution when interpreting B-factors solely as a measure of protein flexibility and motion.