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The Elp2 subunit is essential for elongator complex assembly and functional regulation
Chunming Dong1, Zhijie Lin1, Wentao Diao1
1State Key Laboratory of Medicinal Chemical Biology, Nankai University, 94 Weijin Road, Tianjin 300071, China; College of Life Sciences, Nankai University, 94 Weijin Road, Tianjin 300071, China.
Structure (London, England : 1993)
|May 12, 2015
Summary
The Elp2 subunit
Area of Science:
- Molecular Biology
- Structural Biology
- Cell Biology
Background:
- The Elongator complex, a conserved multiprotein assembly (Elp1-6), is implicated in cellular functions and neurodegenerative diseases.
- Understanding the structural and functional roles of individual subunits is crucial for elucidating Elongator's mechanisms.
Purpose of the Study:
- To determine the crystal structure of the Elp2 subunit.
- To investigate the role of Elp2's WD40 fold integrity in Elongator assembly and function.
- To explore Elp2's interaction with microtubules and its impact on cellular viability and histone acetylation.
Main Methods:
- X-ray crystallography to determine the Elp2 structure.
- Structure-guided mutational analyses to assess subunit binding.
- Biochemical experiments (in vitro and in vivo) to study Elp2-microtubule interactions.
- Yeast viability assays and histone H3 acetylation measurements.
Main Results:
- The crystal structure of Elp2 reveals two seven-bladed WD40 β propellers.
- Elp2's WD40 fold integrity is essential for its binding to Elp1 and Elp3.
- Elp2 directly binds to microtubules via conserved alkaline residues.
- Both Elongator assembly and microtubule association mediated by Elp2 are vital for yeast viability.
- Elp2 mutations impair Elongator's histone H3 acetylation activity.
Conclusions:
- Elp2 is a critical component for the functional integrity and assembly of the Elongator complex.
- Elp2 acts as a molecular hub, bridging Elongator subunits and interacting with the cytoskeleton.
- Elp2's dual role in complex formation and microtubule binding is essential for cellular processes.
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