ArticleProceedings of the National Academy of Sciences of the United States of America2012
Quantifying internal friction in unfolded and intrinsically disordered proteins with single-molecule spectroscopy.
Article in Proceedings of the National Academy of Sciences of the United States of America, 2012. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 156 papers.
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156 citing papers in PubMed, 338 citations in OpenAlex.
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- Direct computations of viscoelastic moduli of biomolecular condensates.The Journal of chemical physics · 2024Article
- Nanosecond chain dynamics of single-stranded nucleic acids.Nature communications · 2024Article
- The role of memory-dependent friction and solvent viscosity in isomerization kinetics in viscogenic media.Nature communications · 2024Article
96 more citing papers are in PubMed but not listed here.
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Authors and funding
10 authors at 3 institutions in 2 countries.
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No grant is acknowledged in the PubMed record.
Abstract
Internal friction, which reflects the "roughness" of the energy landscape, plays an important role for proteins by modulating the dynamics of their folding and other conformational changes. However, the experimental quantification of internal friction and its contribution to folding dynamics has remained challenging. Here we use the combination of single-molecule Förster resonance energy transfer, nanosecond fluorescence correlation spectroscopy, and microfluidic mixing to determine the reconfiguration times of unfolded proteins and investigate the mechanisms of internal friction contributing to their dynamics. Using concepts from polymer dynamics, we determine internal friction with three complementary, largely independent, and consistent approaches as an additive contribution to the reconfiguration time of the unfolded state. We find that the magnitude of internal friction correlates with the compactness of the unfolded protein: its contribution dominates the reconfiguration time of approximately 100 ns of the compact unfolded state of a small cold shock protein under native conditions, but decreases for more expanded chains, and approaches zero both at high denaturant concentrations and in intrinsically disordered proteins that are expanded due to intramolecular charge repulsion. Our results suggest that internal friction in the unfolded state will be particularly relevant for the kinetics of proteins that fold in the microsecond range or faster. The low internal friction in expanded intrinsically disordered proteins may have implications for the dynamics of their interactions with cellular binding partners.
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