| RRC ID |
52346
|
| 著者 |
Ono T, Sakamoto C, Nakao M, Saitoh N, Hirano T.
|
| タイトル |
Condensin II plays an essential role in reversible assembly of mitotic chromosomes in situ.
|
| ジャーナル |
Mol Biol Cell
|
| Abstract |
Condensins I and II are multisubunit complexes that play a central role in mitotic chromosome assembly. Although both complexes become concentrated along the axial region of each chromatid by metaphase, it remains unclear exactly how such axes might assemble and contribute to chromosome shaping. To address these questions from a physico-chemical point of view, we have established a set of two-step protocols for inducing reversible assembly of chromosome structure in situ, namely within a whole cell. In this assay, mitotic chromosomes are first expanded in a hypotonic buffer containing a Mg2+-chelating agent and then converted into different shapes in a NaCl concentration-dependent manner. Both chromatin and condensin-positive chromosome axes are converted into near-original shapes at 100 mM NaCl. This assay combined with small interfering RNA depletion demonstrates that the recovery of chromatin shapes and the reorganization of axes are highly sensitive to depletion of condensin II but less sensitive to depletion of condensin I or topoisomerase IIα. Furthermore, quantitative morphological analyses using the machine-learning algorithm wndchrm support the notion that chromosome shaping is tightly coupled to the reorganization of condensin II-based axes. We propose that condensin II makes a primary contribution to mitotic chromosome architecture and maintenance in human cells.
|
| 巻・号 |
28(21)
|
| ページ |
2875-2886
|
| 公開日 |
2017-10-15
|
| DOI |
10.1091/mbc.E17-04-0252
|
| PII |
mbc.E17-04-0252
|
| PMID |
28835373
|
| PMC |
PMC5638589
|
| MeSH |
Adenosine Triphosphatases / genetics
Adenosine Triphosphatases / metabolism
Adenosine Triphosphatases / physiology*
Cell Cycle Proteins / genetics
Chromatids / chemistry
Chromatids / physiology
Chromatin / chemistry
Chromatin / physiology*
Chromosomal Proteins, Non-Histone / genetics
Chromosomes, Human / genetics
Chromosomes, Human / metabolism
Chromosomes, Human / physiology*
DNA-Binding Proteins / genetics
DNA-Binding Proteins / metabolism
DNA-Binding Proteins / physiology*
HeLa Cells
Humans
Mitosis / physiology
Multiprotein Complexes / genetics
Multiprotein Complexes / metabolism
Multiprotein Complexes / physiology*
Nuclear Proteins / genetics
RNA, Small Interfering
|
| IF |
3.791
|
| 引用数 |
10
|
| リソース情報 |
| ヒト・動物細胞 |
HeLa(RCB0007) |
