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Related Experiment Videos

Proline cis-trans isomerization and protein folding.

William J Wedemeyer1, Ervin Welker, Harold A Scheraga

  • 1Baker Laboratory of Chemistry and Chemical Biology, Cornell University, Ithaca, New York 14853-1301, USA.

Biochemistry
|December 12, 2002
PubMed
Summary

Proline cis-trans isomerization is crucial for protein folding kinetics. Bovine pancreatic ribonuclease A folding illustrates how this process transitions from a mixed isomer state to a native structure with a single proline isomer set.

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Area of Science:

  • Biochemistry and Molecular Biology
  • Protein Dynamics and Folding

Background:

  • Proline cis-trans isomerization is a critical bottleneck in protein folding.
  • The unfolded protein state is heterogeneous, containing both cis and trans proline isomers.
  • The native protein structure typically possesses a single, specific proline isomer configuration.

Purpose of the Study:

  • To summarize the energetic origins of proline cis-trans isomerization.
  • To elucidate the kinetics and structural aspects of protein conformational changes.
  • To exemplify these processes using the folding of bovine pancreatic ribonuclease A.

Main Methods:

  • Analysis of the energetic landscape governing proline isomerization.
  • Kinetic studies on the folding and unfolding pathways of bovine pancreatic ribonuclease A.

Related Experiment Videos

  • Structural characterization of conformational intermediates and the native state.

    • Main Results:

    • Detailed summary of the energetic factors driving proline cis-trans isomerization.
    • Demonstration of the heterogeneous unfolded state comprising both cis and trans X-Pro peptide groups.
    • Observation of the transition to a native structure with a unique proline isomer set during ribonuclease A folding.

    Conclusions:

    • Proline cis-trans isomerization is a rate-limiting step in protein folding.
    • Understanding proline isomer dynamics is essential for comprehending protein folding mechanisms.
    • Bovine pancreatic ribonuclease A serves as a model system for studying these conformational transitions.