| Range |
20-90 rewrappings/sec
|
| Organism |
Eukaryotes |
| Reference |
Li G, Levitus M, Bustamante C, Widom J. Rapid spontaneous accessibility of nucleosomal DNA. Nat Struct Mol Biol. 2005 Jan12(1):46-53.PubMed ID15580276
|
| Method |
Studies using fluorescence resonance energy transfer (FRET) reveal that site exposure involves large increases in separation between a fluorescence donor on one end of the nucleosomal DNA and a fluorescence acceptor on the histone core, implying that site exposure occurs by progressive unwrapping of the nucleosomal DNA starting from one end of the nucleosome. A second approach is based on fluorescence correlation spectroscopy (FCS) of small numbers of nucleosomes at a time, diffusing freely in dilute solution. |
| Comments |
The rewrapping rate constant of approximately 20-90 s-1 corresponds to a lifetime in the unwrapped state (tau unwrapped) = 1/k21 10-50 ms. |
| Entered by |
Uri M |
| ID |
103089 |