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Published on: August 1, 2017
Diverse modes of H3K36me3-guided nucleosomal deacetylation by Rpd3S
Haipeng Guan1,2, Pei Wang1,2, Pei Zhang1,2
1State Key Laboratory of Molecular Oncology, MOE Key Laboratory of Protein Sciences, SXMU-Tsinghua Collaborative Innovation Center for Frontier Medicine, School of Medicine, Tsinghua University, Beijing, China.
The Rpd3S complex uses unique structures to recognize histone marks like H3K36me3, guiding gene regulation. This epigenetic machinery demonstrates complex, dynamic nucleosome engagement for precise deacetylation.
Area of Science:
- Epigenetics
- Molecular Biology
- Structural Biology
Background:
- Dynamic histone modifications are crucial for gene regulation.
- The Rpd3 small (Rpd3S) complex is involved in histone deacetylation guided by H3K36me3 marks.
Purpose of the Study:
- To elucidate the structural basis of Rpd3S function.
- To understand the mechanisms of nucleosome recognition and deacetylation by Rpd3S.
Main Methods:
- Cryo-electron microscopy to determine structures of Rpd3S.
- Biochemical assays to study nucleosome binding and deacetylation activity.
Main Results:
- Determined structures of Saccharomyces cerevisiae Rpd3S in free and H3K36me3 nucleosome-bound states.
- Revealed a unique asymmetric architecture of Rpd3S involving Eaf3-Rco1 heterodimers, Rpd3, and Sin3.
- Demonstrated multivalent recognition of H3K36me3, nucleosomal DNA, and linker DNA for H4 deacetylation.
- Identified an alternative catalytic mode involving H3K4 and H3K36me3 for specific H3 deacetylation.
Conclusions:
- Rpd3S employs dynamic and diverse modes of nucleosome engagement.
- Methylation-guided deacetylation by Rpd3S highlights the complexity of epigenetic regulation.
- The multi-subunit Rpd3S machinery plays a key role in transcription and other cellular processes.
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