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Speeding molecular recognition by using the folding funnel: the fly-casting mechanism.
B A Shoemaker1, J J Portman, P G Wolynes
1Departments of Chemistry and Physics, University of Illinois, 600 South Mathews Avenue, Urbana, IL 61801, USA.
Summary
Unfolded proteins can bind targets more effectively than folded ones. This "fly-casting mechanism" enhances binding rates by allowing proteins to fold upon approaching their binding site.
Area of Science:
- Biochemistry
- Molecular Biology
- Biophysics
Background:
- Protein folding and binding are intrinsically linked processes crucial for cellular function.
- Many cellular proteins exist in an unfolded state, highlighting the coupling of folding and function.
- Understanding how protein conformation influences binding kinetics is essential for molecular interactions.
Purpose of the Study:
- To investigate the influence of protein folding dynamics on binding kinetics.
- To explore how the conformational state of a protein affects its ability to bind to a target site.
- To elucidate the
- fly-casting mechanism
- whereby unfolded proteins exhibit enhanced binding efficiency.
Main Methods:
- Theoretical investigation of protein binding kinetics.
- Modeling the capture radius and binding dynamics of unfolded versus folded proteins.
- Hypothetical kinetic analysis of a repressor molecule binding to a DNA site.
Main Results:
- Unstructured proteins possess a larger effective capture radius compared to their folded counterparts.
- The binding process can initiate at a distance via weak interactions, followed by folding as proximity increases.
- This mechanism, termed
- fly-casting
- , significantly enhances the overall binding rate.
Conclusions:
- Protein folding state critically modulates binding kinetics.
- The
- fly-casting mechanism
- offers a novel perspective on molecular recognition and binding efficiency.
- This mechanism has implications for understanding protein-DNA interactions and other biomolecular binding events.