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Crystal structure of elongator subcomplex Elp4-6
Zhijie Lin1, Weijing Zhao, Wentao Diao
1State Key Laboratory of Medicinal Chemical Biology, Nankai University, 94 Weijin Road, Tianjin 300071, China.
The Journal of Biological Chemistry
|May 5, 2012
Summary
The yeast Elp4-6 subcomplex forms a ring structure crucial for histone H3 binding. This finding advances our understanding of the Elongator complex
Area of Science:
- Molecular Biology
- Structural Biology
- Biochemistry
Background:
- The Elongator complex, comprising Elp1-3 and Elp4-6 subcomplexes, is vital for transcriptional elongation, tRNA modification, and cytoskeleton organization.
- It is a highly conserved complex found in both yeast and humans, highlighting its fundamental biological importance.
Purpose of the Study:
- To determine the crystal structure of the yeast Elp4-6 subcomplex.
- To elucidate the assembly mechanism and functional role of the Elp4-6 subcomplex within the larger Elongator complex.
Main Methods:
- X-ray crystallography to determine the structure of the Elp4-6 subcomplex.
- Site-directed mutagenesis and biochemical assays to investigate assembly and function.
- GST pulldown assays to assess histone H3 binding.
Main Results:
- The crystal structure revealed Elp6 acting as a scaffold, bridging Elp4 and Elp5.
- Each subunit possesses a RecA-ATPase-like fold, despite lacking canonical ATPase motifs.
- The Elp4-6 subcomplex self-assembles into a hexameric ring structure in vitro and in vivo.
- This ring formation is essential for specific binding to histone H3.
Conclusions:
- The Elp4-6 subcomplex forms a ring-shaped structure mediated by Elp6.
- The structural insights into Elp4-6 assembly and histone H3 interaction provide a foundation for understanding holo-Elongator function.
- This study offers a mechanistic view of how Elongator interacts with its substrates.
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