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Related Experiment Videos

Fast coordination changes in cytochrome c do not necessarily imply folding.

A Arcovito1, S Gianni, M Brunori

  • 1Istituto Pasteur-Fondazione Cenci Bolognetti e Centro di Biologia Molecolare del Consiglio Nazionale delle Ricerche, Dipartimento di Scienze Biochimiche Alessandro Rossi-Fanelli, Università di Roma La Sapienza, Piazzale Aldo Moro 5, 00185 Roma, Italy.

The Journal of Biological Chemistry
|August 7, 2001
PubMed
Summary

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Researchers developed rapid photochemical methods to study protein folding rates. This technique uses carbon monoxide (CO) photodissociation to initiate refolding of reduced cytochrome c, overcoming stopped-flow limitations.

Area of Science:

  • Biochemistry
  • Protein dynamics
  • Spectroscopy

Background:

  • Protein folding rates vary widely, with faster processes requiring advanced techniques beyond stopped-flow.
  • Reduced cytochrome c's heme iron is coordinated by histidine (His) and methionine (Met).
  • Carbon monoxide (CO) binds to unfolded reduced cytochrome c, facilitating unfolding at lower denaturant concentrations.

Purpose of the Study:

  • To investigate the folding kinetics of reduced cytochrome c using rapid photochemical methods.
  • To explore the potential of CO photodissociation as a trigger for protein refolding.
  • To address challenges associated with CO photodissociation, such as proximal His-Fe bond breakage.

Main Methods:

  • Utilized rapid photochemical methods to initiate protein folding.

Related Experiment Videos

  • Employed carbon monoxide (CO) as a ligand to probe cytochrome c unfolding.
  • Observed refolding kinetics following CO photodissociation.
  • Performed parallel studies with protoheme and microperoxidase.

    • Main Results:

    • Photochemical removal of CO from unfolded reduced cytochrome c initiated refolding.
    • Observed complications due to proximal His-Fe bond breakage following CO photodissociation.
    • Identified kinetic intermediates resulting from CO rebinding to the four-coordinate heme.
    • Confirmed hypothesis through parallel experiments with protoheme and microperoxidase.

    Conclusions:

    • Rapid photochemical methods offer a viable strategy for studying fast protein folding kinetics.
    • CO photodissociation can initiate refolding but is complicated by heme ligand exchange dynamics.
    • Understanding these dynamics is crucial for accurately studying protein folding mechanisms.