Protein folding: Vexing debates on a fundamental problem.

Area of Science:

• Protein Chemistry
• Biophysics
• Molecular Biology

Background:

• Protein folding is fundamental to protein chemistry and biophysics.
• Despite extensive research since the 1960s, key questions about protein folding persist.
• A lively debate continues regarding specific aspects of this complex process.

Purpose of the Study:

• To provide a personal perspective on critical, unresolved issues in protein folding.
• To discuss the nature of the denatured state of proteins.
• To examine nucleation sites and transition state dynamics in protein folding reactions.

Main Methods:

• This is a review article, synthesizing existing knowledge and presenting a personal account.
• It draws upon decades of research in protein chemistry and biophysics.
• Focuses on theoretical and experimental insights into protein folding pathways.

Main Results:

• The review highlights ongoing debates regarding the characteristics of the denatured protein state.
• It discusses the concept and identification of nucleation sites crucial for initiating folding.
• Examines the temporal aspects of molecules traversing the folding transition state.

Conclusions:

• Unresolved questions in protein folding necessitate continued investigation.
• Understanding the denatured state, nucleation, and transition state dynamics is key.
• Further research is essential to fully elucidate the mechanisms of protein folding.