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Covalently closed circular DNA is known to undergo a temperature-dependent change in helical twist. We have reconstituted nucleosome core particles onto closed circular DNA and measured the thermal untwisting of the DNA as a function of nucleosome density. The results demonstrate that the DNA associated with the nucleosome core particle does not alter its twist when the temperature is varied between 4 degrees C and 37 degrees C, and that the length of DNA prevented from thermal untwisting includes the linker as well as the core DNA.

Nucleosome core particles suppress the thermal untwisting of core DNA and adjacent linker DNA.