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Related Experiment Videos

SecA folding kinetics: a large dimeric protein rapidly forms multiple native states.

Shannon M Doyle1, Osman Bilsel, Carolyn M Teschke

  • 1Department of Molecular and Cell Biology, University of Connecticut, Storrs, CT 06269-3125, USA.

Journal of Molecular Biology
|August 18, 2004
PubMed
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SecA protein dynamics were studied using advanced kinetic techniques. Results show SecA is highly dynamic, folding via multiple pathways and states, crucial for its in vivo function.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Protein Dynamics

Background:

  • SecA is a dimeric ATPase essential for protein translocation via the Sec-dependent pathway.
  • SecA undergoes significant conformational changes during precursor protein translocation across membranes.

Purpose of the Study:

  • To investigate the in vivo dynamics of SecA through in vitro protein folding studies.
  • To elucidate the rapid folding kinetics and conformational states of SecA.

Main Methods:

  • Stopped-flow fluorescence and circular dichroism (CD) spectroscopy.
  • Ultra-rapid continuous flow fluorescence techniques.
  • Sequential-mixing stopped-flow experiments.

Main Results:

Related Experiment Videos

  • SecA dimerization occurs rapidly, near diffusion-limited rates, following a unimolecular rearrangement.
  • Multiple kinetic folding and unfolding phases were identified, indicating multiple native and unfolded states.
  • SecA folding proceeds through parallel channels with sequential intermediates.

    • Conclusions:

    • SecA exhibits high dynamism, consistent with its essential role in vivo.
    • Understanding SecA's complex folding pathways provides insights into protein translocation mechanisms.