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Examining the Conformational Dynamics of Membrane Proteins in situ with Site-directed Fluorescence Labeling
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Conformational change in individual enzyme molecules.

Jeremie J Crawford1, Frannie Itzkow2, Joanna MacLean2

  • 1a Department of Chemistry, 360 Parker Building, University of Manitoba, Winnipeg, MB R3T 2N2, Canada.

Biochemistry and Cell Biology = Biochimie Et Biologie Cellulaire
|November 4, 2015
PubMed
Summary
This summary is machine-generated.

Heat shock proteins did not affect enzyme activity or mobility. Brief heat exposure altered individual enzyme rates and mobility, but population averages remained unchanged, indicating subtle conformational shifts.

Keywords:
capillary electrophoresiscatalytic heterogeneitychangement conformationnelchauffageconformational changeelectrophoretic heterogeneityheat shock proteinsheatinghétérogénéité catalytiquehétérogénéité électrophorétiqueprotéines de choc thermiqueélectrophorèse capillaireβ-galactosidase

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Enzyme Kinetics

Background:

  • Heat shock proteins play crucial roles in cellular response to stress.
  • Understanding enzyme behavior under varying thermal conditions is vital for molecular biology.
  • Single-molecule analysis offers high-resolution insights into enzyme dynamics.

Purpose of the Study:

  • To investigate the impact of heat shock proteins on single beta-galactosidase molecule activity and mobility.
  • To determine how brief temperature fluctuations affect individual enzyme catalytic rates and electrophoretic mobilities.
  • To explore temperature-dependent conformational changes in enzymes.

Main Methods:

  • Single-molecule assays using capillary electrophoresis and laser-induced fluorescence detection.
  • Analysis of beta-galactosidase from E. coli strains with heat shock protein deletions.
  • Measurement of enzyme catalytic rates and electrophoretic mobilities before and after thermal treatments.

Main Results:

  • Heat shock protein expression did not significantly alter the distribution of catalytic rates or mobilities.
  • Brief incubations at 50°C induced changes in individual enzyme catalytic rates and mobilities, with no net population average change.
  • The magnitude of these changes was temperature-dependent, with less effect at 28°C and negligible effect at 10°C.
  • Observed changes in electrophoretic mobility suggest subtle, temperature-induced conformational alterations in the enzyme.

Conclusions:

  • Heat shock proteins do not appear to directly modulate beta-galactosidase's catalytic or electrophoretic properties under tested conditions.
  • Individual enzyme molecules exhibit dynamic responses to thermal stress, with reversible conformational changes.
  • Single-molecule techniques reveal heterogeneity in enzyme responses to temperature, masked in population averages.