Format

Send to

Choose Destination
See comment in PubMed Commons below
Nat Struct Mol Biol. 2009 Feb;16(2):124-9. doi: 10.1038/nsmb.1526. Epub 2009 Jan 11.

High-resolution dynamic mapping of histone-DNA interactions in a nucleosome.

Author information

1
Department of Physics-Laboratory of Atomic and Solid State Physics, Cornell University, Ithaca, New York 14853, USA.

Abstract

The nature of the nucleosomal barrier that regulates access to the underlying DNA during many cellular processes is not fully understood. Here we present a detailed map of histone-DNA interactions along the DNA sequence to near base pair accuracy by mechanically unzipping single molecules of DNA, each containing a single nucleosome. This interaction map revealed a distinct approximately 5-bp periodicity that was enveloped by three broad regions of strong interactions, with the strongest occurring at the dyad and the other two about +/-40-bp from the dyad. Unzipping up to the dyad allowed recovery of a canonical nucleosome upon relaxation of the DNA, but unzipping beyond the dyad resulted in removal of the histone octamer from its initial DNA sequence. These findings have important implications for how RNA polymerase and other DNA-based enzymes may gain access to DNA associated with a nucleosome.

PMID:
19136959
PMCID:
PMC2635915
DOI:
10.1038/nsmb.1526
[Indexed for MEDLINE]
Free PMC Article
PubMed Commons home

PubMed Commons

0 comments
How to join PubMed Commons

    Supplemental Content

    Full text links

    Icon for Nature Publishing Group Icon for PubMed Central
    Loading ...
    Support Center