期刊
GENES & DEVELOPMENT
卷 29, 期 24, 页码 2563-2575出版社
COLD SPRING HARBOR LAB PRESS, PUBLICATIONS DEPT
DOI: 10.1101/gad.272633.115
关键词
nucleosome; prenucleosome; active chromatin; histones; gene expression
资金
- National Science Foundation [1243957]
- National Institute of General Medical Sciences/National Institutes of Health [R01 GM058272]
- Direct For Biological Sciences [1243957] Funding Source: National Science Foundation
- Div Of Molecular and Cellular Bioscience [1243957] Funding Source: National Science Foundation
Chromatin comprises nucleosomes as well as nonnucleosomal histone-DNA particles. Prenucleosomes are rapidly formed histone-DNA particles that can be converted into canonical nucleosomes by a motor protein such as ACF. Here we show that the prenucleosome is a stable conformational isomer of the nucleosome. It consists of a histone octamer associated with similar to 80 base pair (bp) of DNA, which is located at a position that corresponds to the central 80 bp of a nucleosome core particle. Monomeric prenucleosomes with free flanking DNA do not spontaneously fold into nucleosomes but can be converted into canonical nucleosomes by an ATP-driven motor protein such as ACF or Chd1. In addition, histone H3K56, which is located at the DNA entry and exit points of a canonical nucleosome, is specifically acetylated by p300 in prenucleosomes relative to nucleosomes. Prenucleosomes assembled in vitro exhibit properties that are strikingly similar to those of nonnucleosomal histone-DNA particles in the upstream region of active promoters in vivo. These findings suggest that the prenucleosome, the only known stable conformational isomer of the nucleosome, is related to nonnucleosomal histone-DNA species in the cell.
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