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Microfluidic Mixers for Studying Protein Folding
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One-state downhill versus conventional protein folding.

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The small protein BBL does not undergo one-step downhill folding. Instead, thermal denaturation reveals BBL and its homologues exhibit highly cooperative folding, challenging previous hypotheses.

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Area of Science:

  • Biochemistry
  • Structural Biology
  • Protein Dynamics

Background:

  • Classical protein folding involves cooperative transitions between distinct thermodynamic states separated by energy barriers.
  • A hypothesis proposed that the small protein BBL undergoes one-step downhill folding, a non-cooperative process without an energy barrier.

Purpose of the Study:

  • To investigate the folding mechanism of the small protein BBL and its homologues.
  • To determine if BBL exhibits one-step downhill folding or classical cooperative folding.

Main Methods:

  • Thermal denaturation experiments on unlabelled wild-type BBL and its homologues (E3BD, POB).
  • Nuclear Magnetic Resonance (NMR) spectroscopy to monitor the melting of secondary and tertiary interactions and individual residues.
  • Analysis of extrinsic fluorophore effects on protein unfolding energetics.

Main Results:

  • Thermal denaturation of unlabelled wild-type BBL was highly cooperative.
  • Similar cooperative folding patterns were observed for BBL homologues E3BD and POB.
  • Extrinsic fluorophores used in previous studies were found to perturb the unfolding energetics of labelled BBL.

Conclusions:

  • BBL and its well-folded homologues do not exhibit one-step downhill folding.
  • The cooperative folding observed in BBL is consistent with classical protein folding mechanisms.
  • Extrinsic labeling can artifactually influence the observed folding behavior of proteins.