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Nup159 Weakens Gle1 Binding to Dbp5 But Does Not Accelerate ADP Release.
Emily V Wong1, Shawn Gray1, Wenxiang Cao1
1Department of Molecular Biophysics and Biochemistry, Yale University, New Haven, CT 06520, USA.
Journal of Molecular Biology
|May 22, 2018
Summary
Dbp5, a DEAD-box protein crucial for mRNA export, is regulated by Nup159 and Gle1. Nup159 alters the Dbp5-Gle1 interaction, facilitating Gle1 release, rather than directly controlling Dbp5
Area of Science:
- Molecular Biology
- Biochemistry
- Cell Biology
Background:
- Dbp5 (DDX19 in humans) is a DEAD-box protein vital for mRNA export and other cellular processes.
- Its ATPase activity is modulated by RNA, nucleoporins (Nup159, Gle1), and inositol hexakisphosphate (InsP6).
Purpose of the Study:
- To investigate how Nup159 and Mg2+ regulate the Dbp5 mechanochemical cycle.
- To test the hypothesis that Nup159 controls the ADP-bound state of Dbp5.
Main Methods:
- Solution-based in vitro biochemical assays.
- Kinetic and thermodynamic characterization of ADP binding to Dbp5.
- Assessment of Dbp5 activity in the presence of Nup159 and Gle1.
Main Results:
- Mg2+ slows ADP/ATP release and increases affinities for Dbp5, consistent with other NTPases.
- Nup159 did not accelerate ADP release; Gle1 slowed it independently of Mg2+.
- Nup159 reduced the Dbp5-Gle1 interaction by ~18-fold, suggesting it aids Gle1 release.
Conclusions:
- Nup159 does not function as a canonical nucleotide exchange factor for Dbp5.
- Nup159's primary role appears to be modulating the Dbp5-Gle1 interaction to facilitate Gle1 release.
- These findings provide insight into the regulation of Dbp5 in RNA metabolism.
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