Japan Agency for Medical Research and Development (AMED)
JP25ama121009
日本
Japan Agency for Medical Research and Development (AMED)
JP25ama121002
日本
Japan Society for the Promotion of Science (JSPS)
JP25K18403
日本
引用
ジャーナル: iScience / 年: 2026 タイトル: A method for cryo-EM analysis of eukaryotic nucleosomes reconstituted in bacterial cells. 著者: Cheng-Han Ho / Yuki Kobayashi / Mitsuo Ogasawara / Yoshimasa Takizawa / Hitoshi Kurumizaka / 要旨: Conventional methods for preparing nucleosomes are time-consuming and technically demanding. In the present study, we extended the approach of generating nucleosomes in by the co-expression of all ...Conventional methods for preparing nucleosomes are time-consuming and technically demanding. In the present study, we extended the approach of generating nucleosomes in by the co-expression of all four histones, allowing nucleosomes to be assembled in cells. The bacterially reconstituted nucleosomes can be readily prepared from the cells and directly subjected to cryo-EM single particle analysis. Using this method, we obtained a 2.56 Å nucleosome structure that is highly similar to a previously reported nucleosome crystal structure, validating the use of nucleosomes formed in for cryo-EM analysis. Unexpectedly, we also discovered a non-canonical nucleosome structure, in which two hexasomes are closely packed. This system provides a robust and efficient platform for structural studies of nucleosomes and nucleosome variants, and may facilitate the discovery of chromatin architectures.