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| Content Provider | PubMed Central |
|---|---|
| Author | Sheinin, Maxim Y. Ming, Li Soltani, Mohammad Luger, Karolin Wang, Michelle D. |
| Abstract | The nucleosome, the fundamental packing unit of chromatin, has a distinct chirality: 147 bp of DNA are wrapped around the core histones in a left-handed, negative superhelix. It has been suggested that this chirality has functional significance, particularly in the context of the cellular processes that generate DNA supercoiling, such as transcription and replication. However, the impact of torsion on nucleosome structure and stability is largely unknown. Here we perform a detailed investigation of single nucleosome behavior on the high affinity 601 positioning sequence under tension and torque using the angular optical trapping technique. We find that torque has only a moderate effect on nucleosome unwrapping. In contrast, we observe a dramatic loss of H2A/H2B dimers upon nucleosome disruption under positive torque, while (H3/H4)2 tetramers are efficiently retained irrespective of torsion. These data indicate that torque could regulate histone exchange during transcription and replication. |
| Related Links | http://dx.doi.org/10.1038/ncomms3579 |
| Ending Page | 2579 |
| Page Count | 1 |
| Starting Page | 2579 |
| File Format | |
| ISSN | 20411723 |
| e-ISSN | 20411723 |
| Journal | Nature communications |
| Volume Number | 4 |
| Language | English |
| Publisher Date | 2013-01-01 |
| Access Restriction | Open |
| Subject Keyword | Research in Higher Education |
| Content Type | Text |
| Resource Type | Article |
| Subject | Chemistry Physics and Astronomy Biochemistry, Genetics and Molecular Biology |
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