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Updated: May 26, 2025

Comparing the Affinity of GTPase-binding Proteins using Competition Assays
Published on: October 8, 2015
Disordered C-Terminus Plays a Critical Role in the Activity of the Small GTPase Ran
Wenyuan Wei1,2, Melissa Valerio2,3, Ning Ma1
1Department of Computational and Quantitative Medicine, Beckman Research Institute of the City of Hope, Duarte, California 91010, United States.
Researchers identified key interactions in the Ran protein's C-terminus, crucial for regulating its activity. This discovery enables the development of new drugs targeting leukemia stem cells by inhibiting Ran-mediated transport.
Area of Science:
- Biochemistry
- Molecular Biology
- Cancer Research
Background:
- Ran GTPase regulates nucleocytoplasmic transport, including microRNA-126 (miR-126) essential for leukemia stem cells (LSCs).
- Targeting Ran is difficult due to its protein structure, but its disordered C-terminus offers potential binding sites.
Purpose of the Study:
- To inhibit Ran's function in pre-miR-126 transport to the cytoplasm.
- To understand the role of Ran's C-terminus in its functional regulation and identify potential drug targets.
Main Methods:
- Molecular dynamics simulations and experimental validation.
- Computational deep mutational scanning.
- Analysis of allosteric communication between Ran's C-terminus and its core regions.
Main Results:
- The C-terminus ensemble of conformations is critical for Ran's GTP/GDP state transitions.
- Ran's C-terminus allosterically modulates nucleotide binding and Switch 1/2 regions.
- Identified key residues (L182, Y197, D200, L201) and mutations (V27A, E70D, N122A/Y) mediating allosteric communication.
Conclusions:
- Understanding Ran's C-terminal allostery provides a basis for designing novel allosteric modulators.
- This research opens new avenues for targeting Ran in cancer therapy, particularly for leukemia.
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