Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 97, Issue 25, Pages 13518-13522Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.250473497
Keywords
molecular dynamics; fast unfolding; helix docking; residual structure
Categories
Funding
- NIGMS NIH HHS [R01 GM050789, GM 50789, R29 GM050789] Funding Source: Medline
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The Engrailed Homeodomain protein has the highest refolding and unfolding rate constants directly observed to date. Temperature jump relaxation measurements gave a refolding rate constant of 37,500 s(-1) in water at 25 degreesC, rising to 51,000 s(-1) around 42 degreesC. The unfolding rate constant was 1,100 s(-1) in water at 25 degreesC and 205,000 s(-1) at 63 degreesC. The unfolding half-life is extrapolated to be approximate to7.5 ns at 100 degreesC, which allows real-time molecular dynamics unfolding simulations to be tested an this system at a realistic temperature. Preliminary simulations did indeed conform to unfolding on this time scale. Further, similar transition states were observed in simulations at 100 degreesC and 225 degreesC, suggesting that high-temperature simulations provide results applicable to lower temperatures.
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