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Interaction between the small GTPase Ran/Gsp1p and Ntf2p is required for nuclear transport
D H Wong1, A H Corbett, H M Kent
1Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, Dana-Farber Cancer Institute, Boston, Massachusetts 02115, USA.
Molecular and Cellular Biology
|July 1, 1997
Summary
Researchers identified specific mutations in the GSP1 gene, which codes for a protein crucial for nuclear transport. These mutations impair the interaction between Gsp1p and Ntf2p, highlighting its importance in moving molecules across the nuclear envelope.
Area of Science:
- Cell Biology
- Molecular Biology
- Genetics
Background:
- Nuclear transport of proteins and RNAs relies on Ran, a Ras-like GTPase.
- Understanding Ran's function is key to comprehending nuclear envelope dynamics.
Purpose of the Study:
- To isolate and characterize conditional alleles of GSP1, the yeast homolog of Ran.
- To investigate the role of Gsp1p and its interaction with Ntf2p in nuclear transport.
Main Methods:
- Genetic screening in Saccharomyces cerevisiae to identify temperature-sensitive GSP1 alleles.
- Biochemical and genetic analyses to assess protein interactions and transport defects.
- Functional studies involving gene overexpression and mutant analysis.
Main Results:
- Two temperature-sensitive GSP1 alleles (gsp1-1, gsp1-2) were isolated, with mutations in conserved Ras family regions.
- Mutant strains showed nuclear transport defects, linked to reduced interaction between Gsp1p and Ntf2p.
- Overexpression of NTF2 suppressed mutant phenotypes, while a non-binding NTF2 mutant failed to rescue.
Conclusions:
- The interaction between Gsp1p (Ran) and Ntf2p is essential for efficient nuclear transport.
- Specific mutations affecting this interaction disrupt protein and RNA movement across the nuclear envelope.
- This study provides critical insights into the molecular mechanisms governing nucleocytoplasmic transport.